Develop Reference

How to select only one switch in a recycler view?

I have come across a problem while trying to add a switch to each element of my recycler adapter.
What I want to achieve is to have only ONE switch selected at a time, so whenever I check a switch every other switch should automatically be unchecked.
This is the recycler adapter code I am currently using:
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private final DomainAdapter DA = DomainAdapter.getInstance();
private final ArrayList<ArrayList<String>> list;
private String selected;
public RecyclerAdapter(ArrayList<ArrayList<String>> list, String selected) {
this.list = list;
this.selected = selected;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.list_element, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
if (list.get(position).get(0).equals(selected)) holder.switchButton.setChecked(true);
else holder.switchButton.setChecked(false);
holder.switchButton.setOnCheckedChangeListener((toggleButton, isChecked) -> {
if (isChecked) {
try {
DA.select(list.get(position).get(0));
} catch (NoSuchMethodException ignore) {}
}
else {
}
});
}
#Override
public int getItemCount() {
return list.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
Switch switchButton;
public ViewHolder(#NonNull View itemView) {
super(itemView);
switchButton = itemView.findViewById(R.id.switchButton);
}
}
}
I would really appreciate it if someone could tell me what I'm doing wrong.
Thank you!

Your logic is a bit incorrect.
You do :
if (list.get(position).get(0).equals(selected)) holder.switchButton.setChecked(true);
else holder.switchButton.setChecked(false);
And this invokes the checkedChange listener that you set a line later, in the next iteration after it has been set for the first time.
Remove the checkChangeListener and set a click listener instead.
Also, set the click listener in the onCreateViewHolder rather than in the onBindViewHolder
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.list_element, parent, false);
ViewHolder vh = new ViewHolder(view);
vh.switchButton.setOnClickListener( new OnClickListener() {
#Override
public void onClick(View view) {
setItemSelected(vh.getAdapterPosition());
}
});
return vh;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position)
{
boolean isSelected = list.get(position).get(0).equals(selected);
holder.switchButton.setChecked(isSelected);
}
private void setItemSelected(int position) {
DA.select(list.get(position).get(0));
selected = list.get(position).get(0);
notifyDataSetChanged();
}

Different layouts for cardViews in a RecycleView [duplicate]

From Create dynamic lists with RecyclerView:
When we create a RecyclerView.Adapter we have to specify ViewHolder that will bind with the adapter.
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private String[] mDataset;
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ViewHolder(TextView v) {
super(v);
mTextView = v;
}
}
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.some_layout, parent, false);
//findViewById...
ViewHolder vh = new ViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.mTextView.setText(mDataset[position]);
}
#Override
public int getItemCount() {
return mDataset.length;
}
}
Is it possible to create RecyclerView with multiple view types?

Yes, it's possible. Just implement getItemViewType(), and take care of the viewType parameter in onCreateViewHolder().
So you do something like:
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
class ViewHolder0 extends RecyclerView.ViewHolder {
...
public ViewHolder0(View itemView){
...
}
}
class ViewHolder2 extends RecyclerView.ViewHolder {
...
public ViewHolder2(View itemView){
...
}
#Override
public int getItemViewType(int position) {
// Just as an example, return 0 or 2 depending on position
// Note that unlike in ListView adapters, types don't have to be contiguous
return position % 2 * 2;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 0: return new ViewHolder0(...);
case 2: return new ViewHolder2(...);
...
}
}
#Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolder0 viewHolder0 = (ViewHolder0)holder;
...
break;
case 2:
ViewHolder2 viewHolder2 = (ViewHolder2)holder;
...
break;
}
}
}

If the layouts for view types are only a few and binding logics are simple, follow Anton's solution. But the code will be messy if you need to manage the complex layouts and binding logics.
I believe the following solution will be useful for someone who need to handle complex view types.
Base DataBinder class
abstract public class DataBinder<T extends RecyclerView.ViewHolder> {
private DataBindAdapter mDataBindAdapter;
public DataBinder(DataBindAdapter dataBindAdapter) {
mDataBindAdapter = dataBindAdapter;
}
abstract public T newViewHolder(ViewGroup parent);
abstract public void bindViewHolder(T holder, int position);
abstract public int getItemCount();
......
}
The functions needed to define in this class are pretty much same as the adapter class when creating the single view type.
For each view type, create the class by extending this DataBinder.
Sample DataBinder class
public class Sample1Binder extends DataBinder<Sample1Binder.ViewHolder> {
private List<String> mDataSet = new ArrayList();
public Sample1Binder(DataBindAdapter dataBindAdapter) {
super(dataBindAdapter);
}
#Override
public ViewHolder newViewHolder(ViewGroup parent) {
View view = LayoutInflater.from(parent.getContext()).inflate(
R.layout.layout_sample1, parent, false);
return new ViewHolder(view);
}
#Override
public void bindViewHolder(ViewHolder holder, int position) {
String title = mDataSet.get(position);
holder.mTitleText.setText(title);
}
#Override
public int getItemCount() {
return mDataSet.size();
}
public void setDataSet(List<String> dataSet) {
mDataSet.addAll(dataSet);
}
static class ViewHolder extends RecyclerView.ViewHolder {
TextView mTitleText;
public ViewHolder(View view) {
super(view);
mTitleText = (TextView) view.findViewById(R.id.title_type1);
}
}
}
In order to manage DataBinder classes, create an adapter class.
Base DataBindAdapter class
abstract public class DataBindAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return getDataBinder(viewType).newViewHolder(parent);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
int binderPosition = getBinderPosition(position);
getDataBinder(viewHolder.getItemViewType()).bindViewHolder(viewHolder, binderPosition);
}
#Override
public abstract int getItemCount();
#Override
public abstract int getItemViewType(int position);
public abstract <T extends DataBinder> T getDataBinder(int viewType);
public abstract int getPosition(DataBinder binder, int binderPosition);
public abstract int getBinderPosition(int position);
......
}
Create the class by extending this base class, and then instantiate DataBinder classes and override abstract methods
getItemCount
Return the total item count of DataBinders
getItemViewType
Define the mapping logic between the adapter position and view type.
getDataBinder
Return the DataBinder instance based on the view type
getPosition
Define convert logic to the adapter position from the position in the specified DataBinder
getBinderPosition
Define convert logic to the position in the DataBinder from the adapter position
I left a more detailed solution and samples on GitHub, so please refer to RecyclerView-MultipleViewTypeAdapter if you need.

The below is not pseudocode. I have tested it and it has worked for me.
I wanted to create a headerview in my recyclerview and then display a list of pictures below the header which the user can click on.
I used a few switches in my code and don't know if that is the most efficient way to do this, so feel free to give your comments:
public class ViewHolder extends RecyclerView.ViewHolder{
//These are the general elements in the RecyclerView
public TextView place;
public ImageView pics;
//This is the Header on the Recycler (viewType = 0)
public TextView name, description;
//This constructor would switch what to findViewBy according to the type of viewType
public ViewHolder(View v, int viewType) {
super(v);
if (viewType == 0) {
name = (TextView) v.findViewById(R.id.name);
decsription = (TextView) v.findViewById(R.id.description);
} else if (viewType == 1) {
place = (TextView) v.findViewById(R.id.place);
pics = (ImageView) v.findViewById(R.id.pics);
}
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType)
{
View v;
ViewHolder vh;
// create a new view
switch (viewType) {
case 0: //This would be the header view in my Recycler
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recyclerview_welcome, parent, false);
vh = new ViewHolder(v,viewType);
return vh;
default: //This would be the normal list with the pictures of the places in the world
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recyclerview_picture, parent, false);
vh = new ViewHolder(v, viewType);
v.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext, nextActivity.class);
intent.putExtra("ListNo",mRecyclerView.getChildPosition(v));
mContext.startActivity(intent);
}
});
return vh;
}
}
//Overridden so that I can display custom rows in the recyclerview
#Override
public int getItemViewType(int position) {
int viewType = 1; //Default is 1
if (position == 0) viewType = 0; //If zero, it will be a header view
return viewType;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
//position == 0 means it's the info header view on the Recycler
if (position == 0) {
holder.name.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(mContext,"name clicked", Toast.LENGTH_SHORT).show();
}
});
holder.description.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(mContext,"description clicked", Toast.LENGTH_SHORT).show();
}
});
//This means it is beyond the headerview now as it is no longer 0. For testing purposes, I'm alternating between two pics for now
} else if (position > 0) {
holder.place.setText(mDataset[position]);
if (position % 2 == 0) {
holder.pics.setImageDrawable(mContext.getResources().getDrawable(R.drawable.pic1));
}
if (position % 2 == 1) {
holder.pics.setImageDrawable(mContext.getResources().getDrawable(R.drawable.pic2));
}
}
}

Here is a complete sample to show a RecyclerView with two types, the view type decided by the object.
Class model
open class RecyclerViewItem
class SectionItem(val title: String) : RecyclerViewItem()
class ContentItem(val name: String, val number: Int) : RecyclerViewItem()
Adapter code
const val VIEW_TYPE_SECTION = 1
const val VIEW_TYPE_ITEM = 2
class UserAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
var data = listOf<RecyclerViewItem>()
override fun getItemViewType(position: Int): Int {
if (data[position] is SectionItem) {
return VIEW_TYPE_SECTION
}
return VIEW_TYPE_ITEM
}
override fun getItemCount(): Int {
return data.size
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
if (viewType == VIEW_TYPE_SECTION) {
return SectionViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_user_section, parent, false)
)
}
return ContentViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_user_content, parent, false)
)
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
val item = data[position]
if (holder is SectionViewHolder && item is SectionItem) {
holder.bind(item)
}
if (holder is ContentViewHolder && item is ContentItem) {
holder.bind(item)
}
}
internal inner class SectionViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(item: SectionItem) {
itemView.text_section.text = item.title
}
}
internal inner class ContentViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(item: ContentItem) {
itemView.text_name.text = item.name
itemView.text_number.text = item.number.toString()
}
}
}
item_user_section.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/text_section"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#eee"
android:padding="16dp" />
item_user_content.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="32dp">
<TextView
android:id="#+id/text_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="Name" />
<TextView
android:id="#+id/text_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Example using
val dataSet = arrayListOf<RecyclerViewItem>(
SectionItem("A1"),
ContentItem("11", 11),
ContentItem("12", 12),
ContentItem("13", 13),
SectionItem("A2"),
ContentItem("21", 21),
ContentItem("22", 22),
SectionItem("A3"),
ContentItem("31", 31),
ContentItem("32", 32),
ContentItem("33", 33),
ContentItem("33", 34),
)
recyclerAdapter.data = dataSet
recyclerAdapter.notifyDataSetChanged()

Create a different ViewHolder for different layouts
RecyclerView can have any number of viewholders you want, but for better readability let’s see how to create one with two ViewHolders.
It can be done in three simple steps
Override public int getItemViewType(int position)
Return different ViewHolders based on the ViewType in onCreateViewHolder() method
Populate View based on the itemViewType in onBindViewHolder() method
Here is a small code snippet:
public class YourListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int LAYOUT_ONE = 0;
private static final int LAYOUT_TWO = 1;
#Override
public int getItemViewType(int position)
{
if(position==0)
return LAYOUT_ONE;
else
return LAYOUT_TWO;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = null;
RecyclerView.ViewHolder viewHolder = null;
if(viewType==LAYOUT_ONE)
{
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.one,parent,false);
viewHolder = new ViewHolderOne(view);
}
else
{
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.two,parent,false);
viewHolder= new ViewHolderTwo(view);
}
return viewHolder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
if(holder.getItemViewType() == LAYOUT_ONE)
{
// Typecast Viewholder
// Set Viewholder properties
// Add any click listener if any
}
else {
ViewHolderOne vaultItemHolder = (ViewHolderOne) holder;
vaultItemHolder.name.setText(displayText);
vaultItemHolder.name.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
.......
}
});
}
}
//**************** VIEW HOLDER 1 ******************//
public class ViewHolderOne extends RecyclerView.ViewHolder {
public TextView name;
public ViewHolderOne(View itemView) {
super(itemView);
name = (TextView)itemView.findViewById(R.id.displayName);
}
}
//**************** VIEW HOLDER 2 ******************//
public class ViewHolderTwo extends RecyclerView.ViewHolder {
public ViewHolderTwo(View itemView) {
super(itemView);
..... Do something
}
}
}
getItemViewType(int position) is the key.
In my opinion, the starting point to create this kind of recyclerView is the knowledge of this method. Since this method is optional to override, it is not visible in RecylerView class by default which in turn makes many developers (including me) wonder where to begin.
Once you know that this method exists, creating such RecyclerView would be a cakewalk.
Let's see one example to prove my point. If you want to show two layout
at alternate positions do this
#Override
public int getItemViewType(int position)
{
if(position%2==0) // Even position
return LAYOUT_ONE;
else // Odd position
return LAYOUT_TWO;
}
Relevant Links:
Check out the project where I have implemented this.

Yes, it is possible.
Write a generic view holder:
public abstract class GenericViewHolder extends RecyclerView.ViewHolder
{
public GenericViewHolder(View itemView) {
super(itemView);
}
public abstract void setDataOnView(int position);
}
then create your view holders and make them extend the GenericViewHolder. For example, this one:
public class SectionViewHolder extends GenericViewHolder{
public final View mView;
public final TextView dividerTxtV;
public SectionViewHolder(View itemView) {
super(itemView);
mView = itemView;
dividerTxtV = (TextView) mView.findViewById(R.id.dividerTxtV);
}
#Override
public void setDataOnView(int position) {
try {
String title= sections.get(position);
if(title!= null)
this.dividerTxtV.setText(title);
}catch (Exception e){
new CustomError("Error!"+e.getMessage(), null, false, null, e);
}
}
}
then the RecyclerView.Adapter class will look like this one:
public class MyClassRecyclerViewAdapter extends RecyclerView.Adapter<MyClassRecyclerViewAdapter.GenericViewHolder> {
#Override
public int getItemViewType(int position) {
// depends on your problem
switch (position) {
case : return VIEW_TYPE1;
case : return VIEW_TYPE2;
...
}
}
#Override
public GenericViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
if(viewType == VIEW_TYPE1){
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout1, parent, false);
return new SectionViewHolder(view);
}else if( viewType == VIEW_TYPE2){
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout2, parent, false);
return new OtherViewHolder(view);
}
// Cont. other view holders ...
return null;
}
#Override
public void onBindViewHolder(GenericViewHolder holder, int position) {
holder.setDataOnView(position);
}

Yes, it is possible.
In your adapter getItemViewType Layout like this ....
public class MultiViewTypeAdapter extends RecyclerView.Adapter {
private ArrayList<Model>dataSet;
Context mContext;
int total_types;
MediaPlayer mPlayer;
private boolean fabStateVolume = false;
public static class TextTypeViewHolder extends RecyclerView.ViewHolder {
TextView txtType;
CardView cardView;
public TextTypeViewHolder(View itemView) {
super(itemView);
this.txtType = (TextView) itemView.findViewById(R.id.type);
this.cardView = (CardView) itemView.findViewById(R.id.card_view);
}
}
public static class ImageTypeViewHolder extends RecyclerView.ViewHolder {
TextView txtType;
ImageView image;
public ImageTypeViewHolder(View itemView) {
super(itemView);
this.txtType = (TextView) itemView.findViewById(R.id.type);
this.image = (ImageView) itemView.findViewById(R.id.background);
}
}
public static class AudioTypeViewHolder extends RecyclerView.ViewHolder {
TextView txtType;
FloatingActionButton fab;
public AudioTypeViewHolder(View itemView) {
super(itemView);
this.txtType = (TextView) itemView.findViewById(R.id.type);
this.fab = (FloatingActionButton) itemView.findViewById(R.id.fab);
}
}
public MultiViewTypeAdapter(ArrayList<Model>data, Context context) {
this.dataSet = data;
this.mContext = context;
total_types = dataSet.size();
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
switch (viewType) {
case Model.TEXT_TYPE:
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.text_type, parent, false);
return new TextTypeViewHolder(view);
case Model.IMAGE_TYPE:
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_type, parent, false);
return new ImageTypeViewHolder(view);
case Model.AUDIO_TYPE:
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.audio_type, parent, false);
return new AudioTypeViewHolder(view);
}
return null;
}
#Override
public int getItemViewType(int position) {
switch (dataSet.get(position).type) {
case 0:
return Model.TEXT_TYPE;
case 1:
return Model.IMAGE_TYPE;
case 2:
return Model.AUDIO_TYPE;
default:
return -1;
}
}
#Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int listPosition) {
Model object = dataSet.get(listPosition);
if (object != null) {
switch (object.type) {
case Model.TEXT_TYPE:
((TextTypeViewHolder) holder).txtType.setText(object.text);
break;
case Model.IMAGE_TYPE:
((ImageTypeViewHolder) holder).txtType.setText(object.text);
((ImageTypeViewHolder) holder).image.setImageResource(object.data);
break;
case Model.AUDIO_TYPE:
((AudioTypeViewHolder) holder).txtType.setText(object.text);
}
}
}
#Override
public int getItemCount() {
return dataSet.size();
}
}
For the reference link: Android RecyclerView Example – Multiple ViewTypes

Simpler than ever, forget about ViewTypes. It is not recommended to use multiple viewtypes inside one adapter. It will mess the code and break the single responsibility principle since now the adapter needs to handle logic to know which view to inflate.
Now imagine working in large teams where each team has to work in one of those viewtypes features. It will be a mess to touch the same adapter by all the teams that work in the different viewtypes. This is solved using ConcatAdapter where you isolate the adapters. Code them one by one and then just merge them inside one view.
From recyclerview:1.2.0-alpha04 you now can use ConcatAdapter.
If you need a view with different viewTypes, you can just write the Adapters for each section and just use ConcatAdapter to merge all of them inside one recyclerview.
ConcatAdapter
This image shows three different viewtypes that one recyclerview has, header, content and footer.
You only create one adapter for each section, and then just use ConcatAdapter to merge them inside one recyclerview:
val firstAdapter: FirstAdapter = …
val secondAdapter: SecondAdapter = …
val thirdAdapter: ThirdAdapter = …
val concatAdapter = ConcatAdapter(firstAdapter, secondAdapter,
thirdAdapter)
recyclerView.adapter = concatAdapter
That's all you need to know. If you want to handle loading state, for example remove the last adapter after some loading happened, you can use LoadState.
For more in depth information follow Florina Muntenescu post here https://medium.com/androiddevelopers/merge-adapters-sequentially-with-mergeadapter-294d2942127a

Following Anton's solution, I came up with this ViewHolder which holds/handles/delegates different type of layouts.
But I am not sure if the replacing new layout would work when the recycling view's ViewHolder is not the type of the data roll in.
So basically,
onCreateViewHolder(ViewGroup parent, int viewType) is only called when new view layout is needed;
getItemViewType(int position) will be called for the viewType;
onBindViewHolder(ViewHolder holder, int position) is always called when recycling the view (new data is brought in and try to display with that ViewHolder).
So when onBindViewHolder is called it needs to be put in the right view layout and update the ViewHolder.
public int getItemViewType(int position) {
TypedData data = mDataSource.get(position);
return data.type;
}
public ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
return ViewHolder.makeViewHolder(parent, viewType);
}
public void onBindViewHolder(ViewHolder holder,
int position) {
TypedData data = mDataSource.get(position);
holder.updateData(data);
}
///
public static class ViewHolder extends
RecyclerView.ViewHolder {
ViewGroup mParentViewGroup;
View mCurrentViewThisViewHolderIsFor;
int mDataType;
public TypeOneViewHolder mTypeOneViewHolder;
public TypeTwoViewHolder mTypeTwoViewHolder;
static ViewHolder makeViewHolder(ViewGroup vwGrp,
int dataType) {
View v = getLayoutView(vwGrp, dataType);
return new ViewHolder(vwGrp, v, viewType);
}
static View getLayoutView(ViewGroup vwGrp,
int dataType) {
int layoutId = getLayoutId(dataType);
return LayoutInflater.from(vwGrp.getContext())
.inflate(layoutId, null);
}
static int getLayoutId(int dataType) {
if (dataType == TYPE_ONE) {
return R.layout.type_one_layout;
} else if (dataType == TYPE_TWO) {
return R.layout.type_two_layout;
}
}
public ViewHolder(ViewGroup vwGrp, View v,
int dataType) {
super(v);
mDataType = dataType;
mParentViewGroup = vwGrp;
mCurrentViewThisViewHolderIsFor = v;
if (data.type == TYPE_ONE) {
mTypeOneViewHolder = new TypeOneViewHolder(v);
} else if (data.type == TYPE_TWO) {
mTypeTwoViewHolder = new TypeTwoViewHolder(v);
}
}
public void updateData(TypeData data) {
mDataType = data.type;
if (data.type == TYPE_ONE) {
mTypeTwoViewHolder = null;
if (mTypeOneViewHolder == null) {
View newView = getLayoutView(mParentViewGroup,
data.type);
/**
* How can I replace a new view with
the view in the parent
view container?
*/
replaceView(mCurrentViewThisViewHolderIsFor,
newView);
mCurrentViewThisViewHolderIsFor = newView;
mTypeOneViewHolder =
new TypeOneViewHolder(newView);
}
mTypeOneViewHolder.updateDataTypeOne(data);
} else if (data.type == TYPE_TWO){
mTypeOneViewHolder = null;
if (mTypeTwoViewHolder == null) {
View newView = getLayoutView(mParentViewGroup,
data.type);
/**
* How can I replace a new view with
the view in the parent view
container?
*/
replaceView(mCurrentViewThisViewHolderIsFor,
newView);
mCurrentViewThisViewHolderIsFor = newView;
mTypeTwoViewHolder =
new TypeTwoViewHolder(newView);
}
mTypeTwoViewHolder.updateDataTypeOne(data);
}
}
}
public static void replaceView(View currentView,
View newView) {
ViewGroup parent = (ViewGroup)currentView.getParent();
if(parent == null) {
return;
}
final int index = parent.indexOfChild(currentView);
parent.removeView(currentView);
parent.addView(newView, index);
}
ViewHolder has member mItemViewType to hold the view.
It looks like in onBindViewHolder(ViewHolder holder, int position) the ViewHolder passed in has been picked up (or created) by looked at getItemViewType(int position) to make sure it is a match, so it may not need to worry there that ViewHolder's type does not match the data[position]'s type.
It looks like The recycle ViewHolder is picked by type, so no warrior there.
Building a RecyclerView LayoutManager – Part 1 answers this question.
It gets the recycle ViewHolder like:
holder = getRecycledViewPool().getRecycledView(mAdapter.getItemViewType(offsetPosition));
Or create a new one if not find recycle ViewHolder of the right type.
public ViewHolder getRecycledView(int viewType) {
final ArrayList<ViewHolder> scrapHeap = mScrap.get(viewType);
if (scrapHeap != null && !scrapHeap.isEmpty()) {
final int index = scrapHeap.size() - 1;
final ViewHolder scrap = scrapHeap.get(index);
scrapHeap.remove(index);
return scrap;
}
return null;
}
View getViewForPosition(int position, boolean dryRun) {
......
if (holder == null) {
final int offsetPosition = mAdapterHelper.findPositionOffset(position);
if (offsetPosition < 0 || offsetPosition >= mAdapter.getItemCount()) {
throw new IndexOutOfBoundsException("Inconsistency detected. Invalid item "
+ "position " + position + "(offset:" + offsetPosition + ")."
+ "state:" + mState.getItemCount());
}
final int type = mAdapter.getItemViewType(offsetPosition);
// 2) Find from scrap via stable ids, if exists
if (mAdapter.hasStableIds()) {
holder = getScrapViewForId(mAdapter.getItemId(offsetPosition), type, dryRun);
if (holder != null) {
// update position
holder.mPosition = offsetPosition;
fromScrap = true;
}
}
if (holder == null && mViewCacheExtension != null) {
// We are NOT sending the offsetPosition because LayoutManager does not
// know it.
final View view = mViewCacheExtension
.getViewForPositionAndType(this, position, type);
if (view != null) {
holder = getChildViewHolder(view);
if (holder == null) {
throw new IllegalArgumentException("getViewForPositionAndType returned"
+ " a view which does not have a ViewHolder");
} else if (holder.shouldIgnore()) {
throw new IllegalArgumentException("getViewForPositionAndType returned"
+ " a view that is ignored. You must call stopIgnoring before"
+ " returning this view.");
}
}
}
if (holder == null) { // fallback to recycler
// try recycler.
// Head to the shared pool.
if (DEBUG) {
Log.d(TAG, "getViewForPosition(" + position + ") fetching from shared "
+ "pool");
}
holder = getRecycledViewPool()
.getRecycledView(mAdapter.getItemViewType(offsetPosition));
if (holder != null) {
holder.resetInternal();
if (FORCE_INVALIDATE_DISPLAY_LIST) {
invalidateDisplayListInt(holder);
}
}
}
if (holder == null) {
holder = mAdapter.createViewHolder(RecyclerView.this,
mAdapter.getItemViewType(offsetPosition));
if (DEBUG) {
Log.d(TAG, "getViewForPosition created new ViewHolder");
}
}
}
boolean bound = false;
if (mState.isPreLayout() && holder.isBound()) {
// do not update unless we absolutely have to.
holder.mPreLayoutPosition = position;
} else if (!holder.isBound() || holder.needsUpdate() || holder.isInvalid()) {
if (DEBUG && holder.isRemoved()) {
throw new IllegalStateException("Removed holder should be bound and it should"
+ " come here only in pre-layout. Holder: " + holder);
}
final int offsetPosition = mAdapterHelper.findPositionOffset(position);
mAdapter.bindViewHolder(holder, offsetPosition);
attachAccessibilityDelegate(holder.itemView);
bound = true;
if (mState.isPreLayout()) {
holder.mPreLayoutPosition = position;
}
}
final ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
final LayoutParams rvLayoutParams;
if (lp == null) {
rvLayoutParams = (LayoutParams) generateDefaultLayoutParams();
holder.itemView.setLayoutParams(rvLayoutParams);
} else if (!checkLayoutParams(lp)) {
rvLayoutParams = (LayoutParams) generateLayoutParams(lp);
holder.itemView.setLayoutParams(rvLayoutParams);
} else {
rvLayoutParams = (LayoutParams) lp;
}
rvLayoutParams.mViewHolder = holder;
rvLayoutParams.mPendingInvalidate = fromScrap && bound;
return holder.itemView;
}

Although the selected answer is correct, I just want to further elaborate it. I found a useful Custom Adapter for multiple View Types in RecyclerView.
Its Kotlin version is here.
The custom adapter is the following:
public class CustomAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final Context context;
ArrayList<String> list; // ArrayList of your Data Model
final int VIEW_TYPE_ONE = 1;
final int VIEW_TYPE_TWO = 2;
public CustomAdapter(Context context, ArrayList<String> list) { // you can pass other parameters in constructor
this.context = context;
this.list = list;
}
private class ViewHolder1 extends RecyclerView.ViewHolder {
TextView yourView;
ViewHolder1(final View itemView) {
super(itemView);
yourView = itemView.findViewById(R.id.yourView); // Initialize your All views prensent in list items
}
void bind(int position) {
// This method will be called anytime a list item is created or update its data
// Do your stuff here
yourView.setText(list.get(position));
}
}
private class ViewHolder2 extends RecyclerView.ViewHolder {
TextView yourView;
ViewHolder2(final View itemView) {
super(itemView);
yourView = itemView.findViewById(R.id.yourView); // Initialize your All views prensent in list items
}
void bind(int position) {
// This method will be called anytime a list item is created or update its data
//Do your stuff here
yourView.setText(list.get(position));
}
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == VIEW_TYPE_ONE) {
return new ViewHolder1(LayoutInflater.from(context).inflate(R.layout.your_list_item_1, parent, false));
}
//if its not VIEW_TYPE_ONE then its VIEW_TYPE_TWO
return new ViewHolder2(LayoutInflater.from(context).inflate(R.layout.your_list_item_2, parent, false));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (list.get(position).type == Something) { // Put your condition, according to your requirements
((ViewHolder1) holder).bind(position);
} else {
((ViewHolder2) holder).bind(position);
}
}
#Override
public int getItemCount() {
return list.size();
}
#Override
public int getItemViewType(int position) {
// Here you can get decide from your model's ArrayList, which type of view you need to load. Like
if (list.get(position).type == Something) { // Put your condition, according to your requirements
return VIEW_TYPE_ONE;
}
return VIEW_TYPE_TWO;
}
}

I have a better solution which allows to create multiple view types in a declarative and type safe way. It’s written in Kotlin which, by the way, is really nice.
Simple view holders for all required view types
class ViewHolderMedium(itemView: View) : RecyclerView.ViewHolder(itemView) {
val icon: ImageView = itemView.findViewById(R.id.icon) as ImageView
val label: TextView = itemView.findViewById(R.id.label) as TextView
}
There is an abstraction of adapter data item. Note that a view type is represented by a hashCode of particular view holder class (KClass in Kotlin)
trait AdapterItem {
val viewType: Int
fun bindViewHolder(viewHolder: RecyclerView.ViewHolder)
}
abstract class AdapterItemBase<T>(val viewHolderClass: KClass<T>) : AdapterItem {
override val viewType: Int = viewHolderClass.hashCode()
abstract fun bindViewHolder(viewHolder: T)
override fun bindViewHolder(viewHolder: RecyclerView.ViewHolder) {
bindViewHolder(viewHolder as T)
}
}
Only bindViewHolder needs to be overridden in concrete adapter item classes (type safe way).
class AdapterItemMedium(val icon: Drawable, val label: String, val onClick: () -> Unit) : AdapterItemBase<ViewHolderMedium>(ViewHolderMedium::class) {
override fun bindViewHolder(viewHolder: ViewHolderMedium) {
viewHolder.icon.setImageDrawable(icon)
viewHolder.label.setText(label)
viewHolder.itemView.setOnClickListener { onClick() }
}
}
List of such AdapterItemMedium objects is a data source for the adapter which actually accepts List<AdapterItem>. See below.
The important part of this solution is a view holder factory which will provide fresh instances of a specific ViewHolder:
class ViewHolderProvider {
private val viewHolderFactories = hashMapOf<Int, Pair<Int, Any>>()
fun provideViewHolder(viewGroup: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val (layoutId: Int, f: Any) = viewHolderFactories.get(viewType)
val viewHolderFactory = f as (View) -> RecyclerView.ViewHolder
val view = LayoutInflater.from(viewGroup.getContext()).inflate(layoutId, viewGroup, false)
return viewHolderFactory(view)
}
fun registerViewHolderFactory<T>(key: KClass<T>, layoutId: Int, viewHolderFactory: (View) -> T) {
viewHolderFactories.put(key.hashCode(), Pair(layoutId, viewHolderFactory))
}
}
And the simple adapter class looks like this:
public class MultitypeAdapter(val items: List<AdapterItem>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
val viewHolderProvider = ViewHolderProvider() // inject ex Dagger2
init {
viewHolderProvider!!.registerViewHolderFactory(ViewHolderMedium::class, R.layout.item_medium, { itemView ->
ViewHolderMedium(itemView)
})
}
override fun getItemViewType(position: Int): Int {
return items[position].viewType
}
override fun getItemCount(): Int {
return items.size()
}
override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): RecyclerView.ViewHolder? {
return viewHolderProvider!!.provideViewHolder(viewGroup, viewType)
}
override fun onBindViewHolder(viewHolder: RecyclerView.ViewHolder, position: Int) {
items[position].bindViewHolder(viewHolder)
}
}
There are only three steps to create a new view type:
create a view holder class
create an adapter item class (extending from AdapterItemBase)
register the view holder class in ViewHolderProvider
Here is an example of this concept: android-drawer-template.
It goes even further - a view type which acts as a spinner component, with selectable adapter items.

It is very simple and straightforward.
Just override the getItemViewType() method in your adapter. On the basis of data return different itemViewType values. E.g., consider an object of type Person with a member isMale, if isMale is true, return 1 and isMale is false, return 2 in the getItemViewType() method.
Now coming to the createViewHolder (ViewGroup parent, int viewType), on the basis of different viewType yon can inflate the different layout file. Like the following:
if (viewType == 1){
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.male, parent, false);
return new AdapterMaleViewHolder(view);
}
else{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.female, parent, false);
return new AdapterFemaleViewHolder(view);
}
in onBindViewHolder (VH holder,int position) check where holder is an instance of AdapterFemaleViewHolder or AdapterMaleViewHolder by instanceof and accordingly assign the values.
ViewHolder may be like this
class AdapterMaleViewHolder extends RecyclerView.ViewHolder {
...
public AdapterMaleViewHolder(View itemView){
...
}
}
class AdapterFemaleViewHolder extends RecyclerView.ViewHolder {
...
public AdapterFemaleViewHolder(View itemView){
...
}
}

I recommend this library from Hannes Dorfmann. It encapsulates all the logic related to a particular view type in a separate object called "AdapterDelegate".
https://github.com/sockeqwe/AdapterDelegates
public class CatAdapterDelegate extends AdapterDelegate<List<Animal>> {
private LayoutInflater inflater;
public CatAdapterDelegate(Activity activity) {
inflater = activity.getLayoutInflater();
}
#Override public boolean isForViewType(#NonNull List<Animal> items, int position) {
return items.get(position) instanceof Cat;
}
#NonNull #Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent) {
return new CatViewHolder(inflater.inflate(R.layout.item_cat, parent, false));
}
#Override public void onBindViewHolder(#NonNull List<Animal> items, int position,
#NonNull RecyclerView.ViewHolder holder, #Nullable List<Object> payloads) {
CatViewHolder vh = (CatViewHolder) holder;
Cat cat = (Cat) items.get(position);
vh.name.setText(cat.getName());
}
static class CatViewHolder extends RecyclerView.ViewHolder {
public TextView name;
public CatViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.name);
}
}
}
public class AnimalAdapter extends ListDelegationAdapter<List<Animal>> {
public AnimalAdapter(Activity activity, List<Animal> items) {
// DelegatesManager is a protected Field in ListDelegationAdapter
delegatesManager.addDelegate(new CatAdapterDelegate(activity))
.addDelegate(new DogAdapterDelegate(activity))
.addDelegate(new GeckoAdapterDelegate(activity))
.addDelegate(23, new SnakeAdapterDelegate(activity));
// Set the items from super class.
setItems(items);
}
}

I firstly recommend you to read Hannes Dorfmann's great article about this topic.
When a new view type comes, you have to edit your adapter and you have to handle so many messy things. Your adapter should be open for extension, but closed for modification.
You may check this two project, they can give the idea about how to handle different ViewTypes in Adapter:
https://github.com/sockeqwe/AdapterDelegates
https://github.com/ibrahimyilmaz/kiel

If anyone is interested to see the super simple solution written in Kotlin, check the blogpost I just created. The example in the blogpost is based on creating Sectioned RecyclerView:
https://brona.blog/2020/06/sectioned-recyclerview-in-three-steps/

Actually, I'd like to improve on Anton's answer.
Since getItemViewType(int position) returns an integer value, you can return the layout resource ID you'd need to inflate. That way you'd save some logic in onCreateViewHolder(ViewGroup parent, int viewType) method.
Also, I wouldn't suggest doing intensive calculations in getItemCount() as that particular function is called at least 5 times while rendering the list, as well as while rendering each item beyond the visible items. Sadly since notifyDatasetChanged() method is final, you can't really override it, but you can call it from another function within the adapter.

You can use the library: https://github.com/vivchar/RendererRecyclerViewAdapter
mRecyclerViewAdapter = new RendererRecyclerViewAdapter(); /* Included from library */
mRecyclerViewAdapter.registerRenderer(new SomeViewRenderer(SomeModel.TYPE, this));
mRecyclerViewAdapter.registerRenderer(...); /* You can use several types of cells */
For each item, you should to implement a ViewRenderer, ViewHolder, SomeModel:
ViewHolder - it is a simple view holder of recycler view.
SomeModel - it is your model with ItemModel interface
public class SomeViewRenderer extends ViewRenderer<SomeModel, SomeViewHolder> {
public SomeViewRenderer(final int type, final Context context) {
super(type, context);
}
#Override
public void bindView(#NonNull final SomeModel model, #NonNull final SomeViewHolder holder) {
holder.mTitle.setText(model.getTitle());
}
#NonNull
#Override
public SomeViewHolder createViewHolder(#Nullable final ViewGroup parent) {
return new SomeViewHolder(LayoutInflater.from(getContext()).inflate(R.layout.some_item, parent, false));
}
}
For more details you can look at the documentation.

View types implementation becomes easier with Kotlin. Here is a sample with this light library https://github.com/Link184/KidAdapter
recyclerView.setUp {
withViewType {
withLayoutResId(R.layout.item_int)
withItems(mutableListOf(1, 2, 3, 4, 5, 6))
bind<Int> { // this - is adapter view hoder itemView, it - current item
intName.text = it.toString()
}
}
withViewType("SECOND_STRING_TAG") {
withLayoutResId(R.layout.item_text)
withItems(mutableListOf("eight", "nine", "ten", "eleven", "twelve"))
bind<String> {
stringName.text = it
}
}
}

You can deal with multipleViewTypes RecyclerAdapter by making getItemViewType() return the expected viewType value for that position.
I prepared an MultipleViewTypeAdapter for constructing an MCQ list for examinations which may throw a question that may have two or more valid answers (checkbox options) and a single answer questions (radiobutton options).
For this I get the type of question from the API response and I used that for deciding which view I have to show for that question.
public class MultiViewTypeAdapter extends RecyclerView.Adapter {
Context mContext;
ArrayList<Question> dataSet;
ArrayList<String> questions;
private Object radiobuttontype1;
//Viewholder to display Questions with checkboxes
public static class Checkboxtype2 extends RecyclerView.ViewHolder {
ImageView imgclockcheck;
CheckBox checkbox;
public Checkboxtype2(#NonNull View itemView) {
super(itemView);
imgclockcheck = (ImageView) itemView.findViewById(R.id.clockout_cbox_image);
checkbox = (CheckBox) itemView.findViewById(R.id.clockout_cbox);
}
}
//Viewholder to display Questions with radiobuttons
public static class Radiobuttontype1 extends RecyclerView.ViewHolder {
ImageView clockout_imageradiobutton;
RadioButton clockout_radiobutton;
TextView sample;
public radiobuttontype1(View itemView) {
super(itemView);
clockout_imageradiobutton = (ImageView) itemView.findViewById(R.id.clockout_imageradiobutton);
clockout_radiobutton = (RadioButton) itemView.findViewById(R.id.clockout_radiobutton);
sample = (TextView) itemView.findViewById(R.id.sample);
}
}
public MultiViewTypeAdapter(ArrayList<QueDatum> data, Context context) {
this.dataSet = data;
this.mContext = context;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
if (viewType.equalsIgnoreCase("1")) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
return new radiobuttontype1(view);
} else if (viewType.equalsIgnoreCase("2")) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_cbox_list_row, viewGroup, false);
view.setHorizontalFadingEdgeEnabled(true);
return new Checkboxtype2(view);
} else if (viewType.equalsIgnoreCase("3")) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
return new Radiobuttontype1(view);
} else if (viewType.equalsIgnoreCase("4")) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
return new Radiobuttontype1(view);
} else if (viewType.equalsIgnoreCase("5")) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.clockout_radio_list_row, viewGroup, false);
return new Radiobuttontype1(view);
}
return null;
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder viewHolder, int viewType) {
if (viewType.equalsIgnoreCase("1")) {
options = dataSet.get(i).getOptions();
question = dataSet.get(i).getQuestion();
image = options.get(i).getValue();
((radiobuttontype1) viewHolder).clockout_radiobutton.setChecked(false);
((radiobuttontype1) viewHolder).sample.setText(question);
//Loading image bitmap in the ViewHolder's View
Picasso.with(mContext)
.load(image)
.into(((radiobuttontype1) viewHolder).clockout_imageradiobutton);
} else if (viewType.equalsIgnoreCase("2")) {
options = (ArrayList<Clockout_questions_Option>) dataSet.get(i).getOptions();
question = dataSet.get(i).getQuestion();
image = options.get(i).getValue();
//Loading image bitmap in the ViewHolder's View
Picasso.with(mContext)
.load(image)
.into(((Checkboxtype2) viewHolder).imgclockcheck);
} else if (viewType.equalsIgnoreCase("3")) {
//Fit data to viewHolder for ViewType 3
} else if (viewType.equalsIgnoreCase("4")) {
//Fit data to viewHolder for ViewType 4
} else if (viewType.equalsIgnoreCase("5")) {
//Fit data to viewHolder for ViewType 5
}
}
#Override
public int getItemCount() {
return dataSet.size();
}
/**
* Returns viewType for that position by picking the viewType value from the
* dataset
*/
#Override
public int getItemViewType(int position) {
return dataSet.get(position).getViewType();
}
}
You can avoid multiple conditionals based viewHolder data fillings in onBindViewHolder() by assigning same ids for the similar views across viewHolders which differ in their positioning.

If you want to use it in conjunction with Android Data Binding look into the https://github.com/evant/binding-collection-adapter - it is by far the best solution for the multiple view types RecyclerView I have even seen.
You may use it like
var items: AsyncDiffPagedObservableList<BaseListItem> =
AsyncDiffPagedObservableList(GenericDiff)
val onItemBind: OnItemBind<BaseListItem> =
OnItemBind { itemBinding, _, item -> itemBinding.set(BR.item, item.layoutRes) }
And then in the layout where the list is:
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
app:enableAnimations="#{false}"
app:scrollToPosition="#{viewModel.scrollPosition}"
app:itemBinding="#{viewModel.onItemBind}"
app:items="#{viewModel.items}"
app:reverseLayoutManager="#{true}"/>
Your list items must implement the BaseListItem interface which looks like this:
interface BaseListItem {
val layoutRes: Int
}
And the item view should look something like this:
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="item"
type="...presentation.somescreen.list.YourListItem"/>
</data>
...
</layout>
Where YourListItem implements BaseListItem.

First you must create two layout XML files. After that inside recyclerview adapter TYPE_CALL and TYPE_EMAIL are two static values with 1 and 2 respectively in the adapter class.
Now define two static values ​​at the Recycler view Adapter class level, for example: private static int TYPE_CALL = 1; private static int TYPE_EMAIL = 2;
Now create the view holder with multiple views like this:
class CallViewHolder extends RecyclerView.ViewHolder {
private TextView txtName;
private TextView txtAddress;
CallViewHolder(#NonNull View itemView) {
super(itemView);
txtName = itemView.findViewById(R.id.txtName);
txtAddress = itemView.findViewById(R.id.txtAddress);
}
}
class EmailViewHolder extends RecyclerView.ViewHolder {
private TextView txtName;
private TextView txtAddress;
EmailViewHolder(#NonNull View itemView) {
super(itemView);
txtName = itemView.findViewById(R.id.txtName);
txtAddress = itemView.findViewById(R.id.txtAddress);
}
}
Now code as below in onCreateViewHolder and onBindViewHolder method in the recyclerview adapter:
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
View view;
if (viewType == TYPE_CALL) { // for call layout
view = LayoutInflater.from(context).inflate(R.layout.item_call, viewGroup, false);
return new CallViewHolder(view);
} else { // for email layout
view = LayoutInflater.from(context).inflate(R.layout.item_email, viewGroup, false);
return new EmailViewHolder(view);
}
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder viewHolder, int position) {
if (getItemViewType(position) == TYPE_CALL) {
((CallViewHolder) viewHolder).setCallDetails(employees.get(position));
} else {
((EmailViewHolder) viewHolder).setEmailDetails(employees.get(position));
}
}

I did something like this. I passed "fragmentType" and created two ViewHolders and on basis of this, I classified my Layouts accordingly in a single adapter that can have different Layouts and LayoutManagers
private Context mContext;
protected IOnLoyaltyCardCategoriesItemClicked mListener;
private String fragmentType;
private View view;
public LoyaltyCardsCategoriesRecyclerViewAdapter(Context context, IOnLoyaltyCardCategoriesItemClicked itemListener, String fragmentType) {
this.mContext = context;
this.mListener = itemListener;
this.fragmentType = fragmentType;
}
public class LoyaltyCardCategoriesFragmentViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageView lc_categories_iv;
private TextView lc_categories_name_tv;
private int pos;
public LoyaltyCardCategoriesFragmentViewHolder(View v) {
super(v);
view.setOnClickListener(this);
lc_categories_iv = (ImageView) v.findViewById(R.id.lc_categories_iv);
lc_categories_name_tv = (TextView) v.findViewById(R.id.lc_categories_name_tv);
}
public void setData(int pos) {
this.pos = pos;
lc_categories_iv.setImageResource(R.mipmap.ic_launcher);
lc_categories_name_tv.setText("Loyalty Card Categories");
}
#Override
public void onClick(View view) {
if (mListener != null) {
mListener.onLoyaltyCardCategoriesItemClicked(pos);
}
}
}
public class MyLoyaltyCardsFragmentTagViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ImageButton lc_categories_btn;
private int pos;
public MyLoyaltyCardsFragmentTagViewHolder(View v) {
super(v);
lc_categories_btn = (ImageButton) v.findViewById(R.id.lc_categories_btn);
lc_categories_btn.setOnClickListener(this);
}
public void setData(int pos) {
this.pos = pos;
lc_categories_btn.setImageResource(R.mipmap.ic_launcher);
}
#Override
public void onClick(View view) {
if (mListener != null) {
mListener.onLoyaltyCardCategoriesItemClicked(pos);
}
}
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (fragmentType.equalsIgnoreCase(Constants.LoyaltyCardCategoriesFragmentTag)) {
view = LayoutInflater.from(mContext).inflate(R.layout.loyalty_cards_categories_frag_item, parent, false);
return new LoyaltyCardCategoriesFragmentViewHolder(view);
} else if (fragmentType.equalsIgnoreCase(Constants.MyLoyaltyCardsFragmentTag)) {
view = LayoutInflater.from(mContext).inflate(R.layout.my_loyalty_cards_categories_frag_item, parent, false);
return new MyLoyaltyCardsFragmentTagViewHolder(view);
} else {
return null;
}
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
if (fragmentType.equalsIgnoreCase(Constants.LoyaltyCardCategoriesFragmentTag)) {
((LoyaltyCardCategoriesFragmentViewHolder) holder).setData(position);
} else if (fragmentType.equalsIgnoreCase(Constants.MyLoyaltyCardsFragmentTag)) {
((MyLoyaltyCardsFragmentTagViewHolder) holder).setData(position);
}
}
#Override
public int getItemCount() {
return 7;
}

I see there are a lot of great answers, incredibly detailed and extensive. In my case, I always understand things better if I follow along the reasoning from almost scratch, step by step. I would recommend you check this link out and whenever you have similar questions, search for any codelabs that address the issue.
Android Kotlin Fundamentals: Headers in RecyclerView

How to make one view bigger than the other views in RecyclerView?

I have few images in the json API, and I managed to fetch those images using volley Library. I used recyclerview with an image adapter to display image views vertically in two columns, but I want to make one image big and display it as the first image that user can click on. Also that image will be changed each interval of time. Basically, the API will do all the backend task like setting the time and telling which image to be displayed on the top of the recyclerview if not all images must have the same size and be shown in 2 columns vertically.
I have square layout class for recyclerview. I just want to know how I can do this. Even the concept will be fine.

you will have to create two view one for small item other for the header item and in onBindViewHolder have to bind those accordingly the following code is an example of a news article app and should help.
public class AdapterNewsArticlesListWithHeader extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<NewsArticles> items = new ArrayList<>();
private Context ctx;
private NewsArticles header;
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
private OnItemClickListener mOnItemClickListener;
public interface OnItemClickListener {
void onItemClick(View view, NewsArticles obj, int position);
}
public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mOnItemClickListener = mItemClickListener;
}
// Provide a suitable constructor (depends on the kind of dataset)
public AdapterNewsArticlesListWithHeader(Context context, NewsArticles header, List<NewsArticles> items) {
this.items = items;
this.header = header;
ctx = context;
}
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView title;
public TextView short_content;
public TextView date;
public ImageView image;
public LinearLayout lyt_parent;
public ViewHolder(View v) {
super(v);
title = (TextView) v.findViewById(R.id.title);
short_content = (TextView) v.findViewById(R.id.short_content);
date = (TextView) v.findViewById(R.id.date);
image = (ImageView) v.findViewById(R.id.image);
lyt_parent = (LinearLayout) v.findViewById(R.id.lyt_parent);
}
}
class ViewHolderHeader extends RecyclerView.ViewHolder {
public TextView title;
public TextView date;
public ImageView image;
public LinearLayout lyt_parent;
public ViewHolderHeader(View v) {
super(v);
title = (TextView) v.findViewById(R.id.title);
date = (TextView) v.findViewById(R.id.date);
image = (ImageView) v.findViewById(R.id.image);
lyt_parent = (LinearLayout) v.findViewById(R.id.lyt_parent);
}
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_HEADER) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_header, parent, false);
return new ViewHolderHeader(v);
} else if (viewType == TYPE_ITEM) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_news, parent, false);
return new ViewHolder(v);
}
return null;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
if (holder instanceof ViewHolderHeader) {
ViewHolderHeader vHeader = (ViewHolderHeader) holder;
vHeader.title.setText(header.getTitle());
vHeader.date.setText(header.getDate());
Picasso.with(ctx).load(header.getImage()).into(vHeader.image);
vHeader.lyt_parent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//TODO: do your thing
}
});
} else if (holder instanceof ViewHolder) {
final NewsArticles c = items.get(position);
ViewHolder vItem = (ViewHolder) holder;
vItem.title.setText(c.getTitle());
vItem.short_content.setText(c.getShort_content());
vItem.date.setText(c.getDate());
Picasso.with(ctx).load(c.getImage()).into(vItem.image);
vItem.lyt_parent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//TODO: do your thing
}
});
}
}
// need to override this method
#Override
public int getItemViewType(int position) {
if (isPositionHeader(position)) {
return TYPE_HEADER;
}
return TYPE_ITEM;
}
private boolean isPositionHeader(int position) {
return position == 0;
}
public NewsArticles getItem(int position) {
return items.get(position);
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return items.size();
}
}

Android: invert RecyclerView positions

I'm setting a RecyclerView behaving like a list, I want a button in the bottom of the list that when clicked adds more views, I'm thinking the easier way to do it is to make the position 0 as the first one in the bottom, and increasing the position to the top, so I can add views when the the view in position 0 is clicked.
If there is a better aproach for this problem do share.
Here is my adapter:
public class AddEventsAdapter extends RecyclerView.Adapter<AddEventsAdapter.ViewHolder> {
public List<String> items = new ArrayList<>();
public void addItem(String name) {
notifyItemInserted(items.size() - 1);
items.add(name);
}
public void removeItem(int position) {
items.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, items.size());
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.add_event_item, parent, false);
return new ViewHolder(view);
}
#Override
public int getItemCount() {
return items.size();
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.setData(position);
holder.eventName.setText(i + "");
if(position == 0)
{
holder.theLayout.setBackgroundColor(Color.parseColor("#7F9099"));
holder.eventName.setText("Add");
}
}
static int i;
class ViewHolder extends RecyclerView.ViewHolder{
public TextView eventName;
public RelativeLayout theLayout;
public ViewHolder(final View itemView) {
super(itemView);
eventName = (TextView)itemView.findViewById(R.id.eventName);
theLayout = (RelativeLayout)itemView.findViewById(R.id.backgroundevent);
theLayout.setId(++i);
}
public void setData(final int position) {
theLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (position == items.size() - 1) {
addItem("");
} else {
removeItem(position);
}
}
});
}
}
}
You may notice some errors in that, I've been over it for the last 10 hours and I'm having a logic breakdown

It's solved by addind this line to the LayoutManager .setReverseLayout(true);

you can add a footer view at the end of the list and inside that you can add your button. This is the link to create a footer in recycler view https://github.com/u3breeze/android-RecyclerView-WithHeaderAndFooter. You can add the views in the normal way

Why doesn't RecyclerView have onItemClickListener()?

I was exploring RecyclerView and I was surprised to see that RecyclerView does not have onItemClickListener().
I've two question.
Main Question
I want to know why Google removed onItemClickListener()?
Is there a performance issue or something else?
Secondary Question
I solved my problem by writing onClick in my RecyclerView.Adapter:
public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
public TextView txtViewTitle;
public ImageView imgViewIcon;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
}
#Override
public void onClick(View v) {
}
}
Is this ok / is there any better way?

tl;dr 2016 Use RxJava and a PublishSubject to expose an Observable for the clicks.
public class ReactiveAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
String[] mDataset = { "Data", "In", "Adapter" };
private final PublishSubject<String> onClickSubject = PublishSubject.create();
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
final String element = mDataset[position];
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onClickSubject.onNext(element);
}
});
}
public Observable<String> getPositionClicks(){
return onClickSubject.asObservable();
}
}
Original Post:
Since the introduction of ListView, onItemClickListener has been problematic. The moment you have a click listener for any of the internal elements the callback would not be triggered but it wasn't notified or well documented (if at all) so there was a lot of confusion and SO questions about it.
Given that RecyclerView takes it a step further and doesn't have a concept of a row/column, but rather an arbitrarily laid out amount of children, they have delegated the onClick to each one of them, or to programmer implementation.
Think of Recyclerview not as a ListView 1:1 replacement but rather as a more flexible component for complex use cases. And as you say, your solution is what google expected of you. Now you have an adapter who can delegate onClick to an interface passed on the constructor, which is the correct pattern for both ListView and Recyclerview.
public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
public TextView txtViewTitle;
public ImageView imgViewIcon;
public IMyViewHolderClicks mListener;
public ViewHolder(View itemLayoutView, IMyViewHolderClicks listener) {
super(itemLayoutView);
mListener = listener;
txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
imgViewIcon.setOnClickListener(this);
itemLayoutView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v instanceof ImageView){
mListener.onTomato((ImageView)v);
} else {
mListener.onPotato(v);
}
}
public static interface IMyViewHolderClicks {
public void onPotato(View caller);
public void onTomato(ImageView callerImage);
}
}
and then on your adapter
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
String[] mDataset = { "Data" };
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_layout, parent, false);
MyAdapter.ViewHolder vh = new ViewHolder(v, new MyAdapter.ViewHolder.IMyViewHolderClicks() {
public void onPotato(View caller) { Log.d("VEGETABLES", "Poh-tah-tos"); };
public void onTomato(ImageView callerImage) { Log.d("VEGETABLES", "To-m8-tohs"); }
});
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Get element from your dataset at this position
// Replace the contents of the view with that element
// Clear the ones that won't be used
holder.txtViewTitle.setText(mDataset[position]);
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.length;
}
...
Now look into that last piece of code: onCreateViewHolder(ViewGroup parent, int viewType) the signature already suggest different view types. For each one of them you'll require a different viewholder too, and subsequently each one of them can have a different set of clicks. Or you can just create a generic viewholder that takes any view and one onClickListener and applies accordingly. Or delegate up one level to the orchestrator so several fragments/activities have the same list with different click behaviour. Again, all flexibility is on your side.
It is a really needed component and fairly close to what our internal implementations and improvements to ListView were until now. It's good that Google finally acknowledges it.

Why the RecyclerView has no onItemClickListener
The RecyclerView is a toolbox, in contrast of the old ListView it has less build in features and more flexibility. The onItemClickListener is not the only feature being removed from ListView. But it has lot of listeners and method to extend it to your liking, it's far more powerful in the right hands ;).
In my opinion the most complex feature removed in RecyclerView is the Fast Scroll. Most of the other features can be easily re-implemented.
If you want to know what other cool features RecyclerView added read this answer to another question.
Memory efficient - drop-in solution for onItemClickListener
This solution has been proposed by Hugo Visser, an Android GDE, right after RecyclerView was released. He made a licence-free class available for you to just drop in your code and use it.
It showcase some of the versatility introduced with RecyclerView by making use of RecyclerView.OnChildAttachStateChangeListener.
Edit 2019: kotlin version by me, java one, from Hugo Visser, kept below
Kotlin / Java
Create a file values/ids.xml and put this in it:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="item_click_support" type="id" />
</resources>
then add the code below to your source
Kotlin
Usage:
recyclerView.onItemClick { recyclerView, position, v ->
// do it
}
(it also support long item click and see below for another feature I've added).
implementation (my adaptation to Hugo Visser Java code):
typealias OnRecyclerViewItemClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Unit
typealias OnRecyclerViewItemLongClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Boolean
class ItemClickSupport private constructor(private val recyclerView: RecyclerView) {
private var onItemClickListener: OnRecyclerViewItemClickListener? = null
private var onItemLongClickListener: OnRecyclerViewItemLongClickListener? = null
private val attachListener: RecyclerView.OnChildAttachStateChangeListener = object : RecyclerView.OnChildAttachStateChangeListener {
override fun onChildViewAttachedToWindow(view: View) {
// every time a new child view is attached add click listeners to it
val holder = this#ItemClickSupport.recyclerView.getChildViewHolder(view)
.takeIf { it is ItemClickSupportViewHolder } as? ItemClickSupportViewHolder
if (onItemClickListener != null && holder?.isClickable != false) {
view.setOnClickListener(onClickListener)
}
if (onItemLongClickListener != null && holder?.isLongClickable != false) {
view.setOnLongClickListener(onLongClickListener)
}
}
override fun onChildViewDetachedFromWindow(view: View) {
}
}
init {
// the ID must be declared in XML, used to avoid
// replacing the ItemClickSupport without removing
// the old one from the RecyclerView
this.recyclerView.setTag(R.id.item_click_support, this)
this.recyclerView.addOnChildAttachStateChangeListener(attachListener)
}
companion object {
fun addTo(view: RecyclerView): ItemClickSupport {
// if there's already an ItemClickSupport attached
// to this RecyclerView do not replace it, use it
var support: ItemClickSupport? = view.getTag(R.id.item_click_support) as? ItemClickSupport
if (support == null) {
support = ItemClickSupport(view)
}
return support
}
fun removeFrom(view: RecyclerView): ItemClickSupport? {
val support = view.getTag(R.id.item_click_support) as? ItemClickSupport
support?.detach(view)
return support
}
}
private val onClickListener = View.OnClickListener { v ->
val listener = onItemClickListener ?: return#OnClickListener
// ask the RecyclerView for the viewHolder of this view.
// then use it to get the position for the adapter
val holder = this.recyclerView.getChildViewHolder(v)
listener.invoke(this.recyclerView, holder.adapterPosition, v)
}
private val onLongClickListener = View.OnLongClickListener { v ->
val listener = onItemLongClickListener ?: return#OnLongClickListener false
val holder = this.recyclerView.getChildViewHolder(v)
return#OnLongClickListener listener.invoke(this.recyclerView, holder.adapterPosition, v)
}
private fun detach(view: RecyclerView) {
view.removeOnChildAttachStateChangeListener(attachListener)
view.setTag(R.id.item_click_support, null)
}
fun onItemClick(listener: OnRecyclerViewItemClickListener?): ItemClickSupport {
onItemClickListener = listener
return this
}
fun onItemLongClick(listener: OnRecyclerViewItemLongClickListener?): ItemClickSupport {
onItemLongClickListener = listener
return this
}
}
/** Give click-ability and long-click-ability control to the ViewHolder */
interface ItemClickSupportViewHolder {
val isClickable: Boolean get() = true
val isLongClickable: Boolean get() = true
}
// Extension function
fun RecyclerView.addItemClickSupport(configuration: ItemClickSupport.() -> Unit = {}) = ItemClickSupport.addTo(this).apply(configuration)
fun RecyclerView.removeItemClickSupport() = ItemClickSupport.removeFrom(this)
fun RecyclerView.onItemClick(onClick: OnRecyclerViewItemClickListener) {
addItemClickSupport { onItemClick(onClick) }
}
fun RecyclerView.onItemLongClick(onLongClick: OnRecyclerViewItemLongClickListener) {
addItemClickSupport { onItemLongClick(onLongClick) }
}
(Remember you also need to add an XML file, see above this section)
Bonus feature of Kotlin version
Sometimes you do not want all the items of the RecyclerView to be clickable.
To handle this I've introduced the ItemClickSupportViewHolder interface that you can use on your ViewHolder to control which item is clickable.
Example:
class MyViewHolder(view): RecyclerView.ViewHolder(view), ItemClickSupportViewHolder {
override val isClickable: Boolean get() = false
override val isLongClickable: Boolean get() = false
}
Java
Usage:
ItemClickSupport.addTo(mRecyclerView)
.setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
#Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
// do it
}
});
(it also support long item click)
Implementation (comments added by me):
public class ItemClickSupport {
private final RecyclerView mRecyclerView;
private OnItemClickListener mOnItemClickListener;
private OnItemLongClickListener mOnItemLongClickListener;
private View.OnClickListener mOnClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
// ask the RecyclerView for the viewHolder of this view.
// then use it to get the position for the adapter
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
}
};
private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
if (mOnItemLongClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
return false;
}
};
private RecyclerView.OnChildAttachStateChangeListener mAttachListener
= new RecyclerView.OnChildAttachStateChangeListener() {
#Override
public void onChildViewAttachedToWindow(View view) {
// every time a new child view is attached add click listeners to it
if (mOnItemClickListener != null) {
view.setOnClickListener(mOnClickListener);
}
if (mOnItemLongClickListener != null) {
view.setOnLongClickListener(mOnLongClickListener);
}
}
#Override
public void onChildViewDetachedFromWindow(View view) {
}
};
private ItemClickSupport(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
// the ID must be declared in XML, used to avoid
// replacing the ItemClickSupport without removing
// the old one from the RecyclerView
mRecyclerView.setTag(R.id.item_click_support, this);
mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
}
public static ItemClickSupport addTo(RecyclerView view) {
// if there's already an ItemClickSupport attached
// to this RecyclerView do not replace it, use it
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support == null) {
support = new ItemClickSupport(view);
}
return support;
}
public static ItemClickSupport removeFrom(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support != null) {
support.detach(view);
}
return support;
}
public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
mOnItemClickListener = listener;
return this;
}
public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
mOnItemLongClickListener = listener;
return this;
}
private void detach(RecyclerView view) {
view.removeOnChildAttachStateChangeListener(mAttachListener);
view.setTag(R.id.item_click_support, null);
}
public interface OnItemClickListener {
void onItemClicked(RecyclerView recyclerView, int position, View v);
}
public interface OnItemLongClickListener {
boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
}
}
How it works (why it's efficient)
This class works by attaching a RecyclerView.OnChildAttachStateChangeListener to the RecyclerView. This listener is notified every time a child is attached or detached from the RecyclerView. The code use this to append a tap/long click listener to the view. That listener ask the RecyclerView for the RecyclerView.ViewHolder which contains the position.
This is more efficient then other solutions because it avoid creating multiple listeners for each view and keep destroying and creating them while the RecyclerView is being scrolled.
You could also adapt the code to give you back the holder itself if you need more.
Final remark
Keep in mind that it's COMPLETELY fine to handle it in your adapter by setting on each view of your list a click listener, like other answer proposed.
It's just not the most efficient thing to do (you create a new listener every time you reuse a view) but it works and in most cases it's not an issue.
It is also a bit against separation of concerns cause it's not really the Job of the Adapter to delegate click events.

I like this way and I'm using it
Inside
public Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
Put
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_image_and_text, parent, false);
v.setOnClickListener(new MyOnClickListener());
And create this class anywhere you want it
class MyOnClickListener implements View.OnClickListener {
#Override
public void onClick(View v) {
int itemPosition = recyclerView.indexOfChild(v);
Log.e("Clicked and Position is ",String.valueOf(itemPosition));
}
}
I've read before that there is a better way but I like this way is easy and not complicated.

Android Recyclerview With onItemClickListener,
Why we cant try this is working like ListView only.
Source : Link
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener mListener;
public interface OnItemClickListener {
public void onItemClick(View view, int position);
}
GestureDetector mGestureDetector;
public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
And Set this to RecyclerView:
recyclerView = (RecyclerView)rootView. findViewById(R.id.recyclerView);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
// TODO Handle item click
Log.e("#####",""+position);
}
})
);

Thanks to #marmor, I updated my answer.
I think it's a good solution to handle the onClick() in the ViewHolder class constructor and pass it to the parent class via OnItemClickListener interface.
MyAdapter.java
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
private LayoutInflater layoutInflater;
private List<MyObject> items;
private AdapterView.OnItemClickListener onItemClickListener;
public MyAdapter(Context context, AdapterView.OnItemClickListener onItemClickListener, List<MyObject> items) {
layoutInflater = LayoutInflater.from(context);
this.items = items;
this.onItemClickListener = onItemClickListener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.my_row_layout, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
MyObject item = items.get(position);
}
public MyObject getItem(int position) {
return items.get(position);
}
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView title;
private ImageView avatar;
public ViewHolder(View itemView) {
super(itemView);
title = itemView.findViewById(R.id.title);
avatar = itemView.findViewById(R.id.avatar);
title.setOnClickListener(this);
avatar.setOnClickListener(this);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
//passing the clicked position to the parent class
onItemClickListener.onItemClick(null, view, getAdapterPosition(), view.getId());
}
}
}
Usage of adapter in other classes:
MyFragment.java
public class MyFragment extends Fragment implements AdapterView.OnItemClickListener {
private RecyclerView recycleview;
private MyAdapter adapter;
.
.
.
private void init(Context context) {
//passing this fragment as OnItemClickListener to the adapter
adapter = new MyAdapter(context, this, items);
recycleview.setAdapter(adapter);
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//you can get the clicked item from the adapter using its position
MyObject item = adapter.getItem(position);
//you can also find out which view was clicked
switch (view.getId()) {
case R.id.title:
//title view was clicked
break;
case R.id.avatar:
//avatar view was clicked
break;
default:
//the whole row was clicked
}
}
}

> How RecyclerView is different from Listview?
One difference is that there is LayoutManager class with RecyclerView by which you can manage your RecyclerView like-
Horizontal or Vertical scrolling by LinearLayoutManager
GridLayout by GridLayoutManager
Staggered GridLayout by StaggeredGridLayoutManager
Like for horizontal scrolling for RecyclerView-
LinearLayoutManager llm = new LinearLayoutManager(context);
llm.setOrientation(LinearLayoutManager.HORIZONTAL);
recyclerView.setLayoutManager(llm);

Guys use this code in Your main activity. Very Efficient Method
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.users_list);
UsersAdapter adapter = new UsersAdapter(users, this);
recyclerView.setAdapter(adapter);
adapter.setOnCardClickListner(this);
Here is your Adapter class.
public class UsersAdapter extends RecyclerView.Adapter<UsersAdapter.UserViewHolder> {
private ArrayList<User> mDataSet;
OnCardClickListner onCardClickListner;
public UsersAdapter(ArrayList<User> mDataSet) {
this.mDataSet = mDataSet;
}
#Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_row_layout, parent, false);
UserViewHolder userViewHolder = new UserViewHolder(v);
return userViewHolder;
}
#Override
public void onBindViewHolder(UserViewHolder holder, final int position) {
holder.name_entry.setText(mDataSet.get(position).getUser_name());
holder.cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onCardClickListner.OnCardClicked(v, position);
}
});
}
#Override
public int getItemCount() {
return mDataSet.size();
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public static class UserViewHolder extends RecyclerView.ViewHolder {
CardView cardView;
TextView name_entry;
public UserViewHolder(View itemView) {
super(itemView);
cardView = (CardView) itemView.findViewById(R.id.user_layout);
name_entry = (TextView) itemView.findViewById(R.id.name_entry);
}
}
public interface OnCardClickListner {
void OnCardClicked(View view, int position);
}
public void setOnCardClickListner(OnCardClickListner onCardClickListner) {
this.onCardClickListner = onCardClickListner;
}
}
After this you will get this override method in your activity.
#Override
public void OnCardClicked(View view, int position) {
Log.d("OnClick", "Card Position" + position);
}

How to put it all together example...
onClick() handling
Cursor - RecyclerView
ViewHolder types
public class OrderListCursorAdapter extends CursorRecyclerViewAdapter<OrderListCursorAdapter.ViewHolder> {
private static final String TAG = OrderListCursorAdapter.class.getSimpleName();
private static final int ID_VIEW_HOLDER_ACTUAL = 0;
private static final int ID_VIEW_HOLDER = 1;
public OrderListCursorAdapter(Context context, Cursor cursor) {
super(context, cursor);
}
public static class ViewHolderActual extends ViewHolder {
private static final String TAG = ViewHolderActual.class.getSimpleName();
protected IViewHolderClick listener;
protected Button button;
public ViewHolderActual(View v, IViewHolderClick listener) {
super(v, listener);
this.listener = listener;
button = (Button) v.findViewById(R.id.orderList_item_button);
button.setOnClickListener(this);
}
public void initFromData(OrderData data) {
Log.d(TAG, "><initFromData(data=" + data + ")");
orderId = data.getId();
vAddressStart.setText(data.getAddressStart());
vAddressEnd.setText(data.getAddressEnd());
}
#Override
public void onClick(View view) {
if (view instanceof Button) {
listener.onButtonClick((Button) view, getPosition(), this);
} else {
super.onClick(view);
}
}
public interface IViewHolderClick extends ViewHolder.IViewHolderClick {
public void onButtonClick(Button button, int position, ViewHolder viewHolder);
}
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private static final String TAG = ViewHolder.class.getSimpleName();
protected long orderId;
protected IViewHolderClick listener;
protected TextView vAddressStart;
protected TextView vAddressEnd;
protected TextView vStatus;
public ViewHolder(View v, IViewHolderClick listener) {
super(v);
this.listener = listener;
v.setOnClickListener(this);
vAddressStart = (TextView) v.findViewById(R.id.addressStart);
vAddressEnd = (TextView) v.findViewById(R.id.addressEnd);
vStatus = (TextView) v.findViewById(R.id.status);
}
public void initFromData(OrderData data) {
Log.d(TAG, "><initFromData(data=" + data + ")");
orderId = data.getId();
vAddressStart.setText(data.getAddressStart());
vAddressEnd.setText(data.getAddressEnd());
}
public long getOrderId() {
return orderId;
}
#Override
public void onClick(View view) {
listener.onCardClick(view, getPosition(), this);
}
public interface IViewHolderClick {
public void onCardClick(View view, int position, ViewHolder viewHolder);
}
}
#Override
public int getItemViewType(int position) {
return position == 0 ? ID_VIEW_HOLDER_ACTUAL : ID_VIEW_HOLDER;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.d(TAG, ">>onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")");
ViewHolder result;
switch (viewType) {
case ID_VIEW_HOLDER_ACTUAL: {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout_actual, parent, false);
result = new ViewHolderActual(itemView, new ViewHolderActual.IViewHolderClick() {
#Override
public void onCardClick(View view, int position, ViewHolder viewHolder) {
Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
view.getContext().startActivity(intent);
}
#Override
public void onButtonClick(Button button, int position, ViewHolder viewHolder) {
Log.d(TAG, "><onButtonClick(button=" + button + ", position=" + position + ", viewHolder=" + viewHolder + ")");
Intent intent = new Intent(button.getContext(), OrderMapActivity.class);
intent.putExtra(OrderMapActivity.ARG_ORDER_ID, viewHolder.getOrderId());
button.getContext().startActivity(intent);
}
});
break;
}
case ID_VIEW_HOLDER:
default: {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false);
result = new ViewHolder(itemView, new ViewHolder.IViewHolderClick() {
#Override
public void onCardClick(View view, int position, ViewHolder viewHolder) {
Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
view.getContext().startActivity(intent);
}
});
break;
}
}
Log.d(TAG, "<<onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")= " + result);
return result;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {
Log.d(TAG, "><onBindViewHolder(viewHolder=" + viewHolder + ", cursor=" + cursor + ")");
final OrderData orderData = new OrderData(cursor);
viewHolder.initFromData(orderData);
}
}

Following up MLProgrammer-CiM's excellent RxJava solution
Consume / Observe clicks
Consumer<String> mClickConsumer = new Consumer<String>() {
#Override
public void accept(#NonNull String element) throws Exception {
Toast.makeText(getApplicationContext(), element +" was clicked", Toast.LENGTH_LONG).show();
}
};
ReactiveAdapter rxAdapter = new ReactiveAdapter();
rxAdapter.getPositionClicks().subscribe(mClickConsumer);
RxJava 2.+
Modify the original tl;dr as:
public Observable<String> getPositionClicks(){
return onClickSubject;
}
PublishSubject#asObservable() was removed. Just return the PublishSubject which is an Observable.

RecyclerView doesn't have an onItemClickListener because RecyclerView is responsible for recycling views (surprise!), so it's the responsibility of the view that is recycled to handle the click events it receives.
This actually makes it much easier to use, especially if you had items that can be clicked in multiple places.
Anyways, detecting click on a RecyclerView item is very easy. All you need to do is define an interface (if you're not using Kotlin, in which case you just pass in a lambda):
public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
private final Clicks clicks;
public MyAdapter(Clicks clicks) {
this.clicks = clicks;
}
private List<MyObject> items = Collections.emptyList();
public void updateData(List<MyObject> items) {
this.items = items;
notifyDataSetChanged(); // TODO: use ListAdapter for diffing instead if you need animations
}
public interface Clicks {
void onItemSelected(MyObject myObject, int position);
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private MyObject myObject;
public MyViewHolder(View view) {
super(view);
// bind views
view.setOnClickListener((v) -> {
int adapterPosition = getBindingAdapterPosition();
if(adapterPosition >= 0) {
clicks.onItemSelected(myObject, adapterPosition);
}
});
}
public void bind(MyObject myObject) {
this.myObject = myObject;
// bind data to views
}
}
}
Same code in Kotlin:
class MyAdapter(val itemClicks: (MyObject, Int) -> Unit): RecyclerView.Adapter<MyViewHolder>() {
private var items: List<MyObject> = Collections.emptyList()
fun updateData(items: List<MyObject>) {
this.items = items
notifyDataSetChanged() // TODO: use ListAdapter for diffing instead if you need animations
}
inner class MyViewHolder(val myView: View): RecyclerView.ViewHolder(myView) {
private lateinit var myObject: MyObject
init {
// binds views
myView.onClick {
val adapterPosition = getBindingAdapterPosition()
if(adapterPosition >= 0) {
itemClicks.invoke(myObject, adapterPosition)
}
}
}
fun bind(myObject: MyObject) {
this.myObject = myObject
// bind data to views
}
}
}
Thing you DON'T need to do:
1.) you don't need to intercept touch events manually
2.) you don't need to mess around with child attach state change listeners
3.) you don't need PublishSubject/PublishRelay from RxJava
Just use a click listener.

As far as I understand MLProgrammer-CiM answer, simply it's possible to just do this:
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
private ImageView image;
private TextView title;
private TextView price;
public MyViewHolder(View itemView) {
super(itemView);
image = (ImageView)itemView.findViewById(R.id.horizontal_list_image);
title = (TextView)itemView.findViewById(R.id.horizontal_list_title);
price = (TextView)itemView.findViewById(R.id.horizontal_list_price);
image.setOnClickListener(this);
title.setOnClickListener(this);
price.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Toast.makeText(context, "Item click nr: "+getLayoutPosition(), Toast.LENGTH_SHORT).show();
}
}

After reading #MLProgrammer-CiM's answer, here is my code:
class NormalViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
#Bind(R.id.card_item_normal)
CardView cardView;
public NormalViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
cardView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(v instanceof CardView) {
// use getAdapterPosition() instead of getLayoutPosition()
int itemPosition = getAdapterPosition();
removeItem(itemPosition);
}
}
}

I have done this way, its very simple:
Just add 1 Line for Clicked RecyclerView position:
int position = getLayoutPosition()
Full code for ViewHolder class:
private class ChildViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView txtView;
public ChildViewHolder(View itemView) {
super(itemView);
imageView= (ImageView)itemView.findViewById(R.id.imageView);
txtView= (TextView) itemView.findViewById(R.id.txtView);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Log.i("RecyclerView Item Click Position", String.valueOf(getLayoutPosition()));
}
});
}
}
Hope this will help you.

I use this method to start an Intent from RecyclerView:
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
final MyClass myClass = mList.get(i);
viewHolder.txtViewTitle.setText(myclass.name);
...
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
Intent detailIntent = new Intent(mContext, type.class);
detailIntent.putExtra("MyClass", myclass);
mContext.startActivity(detailIntent);
}
}
);

See my approach on this:
First declare an interface like this:
/**
* Interface used for delegating item click events in a {#link android.support.v7.widget.RecyclerView}
* Created by Alex on 11/28/2015.
*/
public interface OnRecyclerItemClickListener<T> {
/**
* Called when a click occurred inside a recyclerView item view
* #param view that was clicked
* #param position of the clicked view
* #param item the concrete data that is displayed through the clicked view
*/
void onItemClick(View view, int position, T item);
}
Then create the adapter:
public class CustomRecyclerAdapter extends RecyclerView.Adapter {
private class InternalClickListener implements View.OnClickListener{
#Override
public void onClick(View v) {
if(mRecyclerView != null && mItemClickListener != null){
// find the position of the item that was clicked
int position = mRecyclerView.getChildAdapterPosition(v);
Data data = getItem(position);
// notify the main listener
mItemClickListener.onItemClick(v, position, data);
}
}
}
private final OnRecyclerItemClickListener mItemClickListener;
private RecyclerView mRecyclerView;
private InternalClickListener mInternalClickListener;
/**
*
* #param itemClickListener used to trigger an item click event
*/
public PlayerListRecyclerAdapter(OnRecyclerItemClickListener itemClickListener){
mItemClickListener = itemClickListener;
mInternalClickListener = new InternalClickListener();
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);
v.setOnClickListener(mInternalClickListener);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// do your binding here
}
#Override
public int getItemCount() {
return mDataSet.size();
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
mRecyclerView = recyclerView;
}
#Override
public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
super.onDetachedFromRecyclerView(recyclerView);
mRecyclerView = null;
}
public Data getItem(int position){
return mDataset.get(position);
}
}
And now let's see how to integrate this from a fragment:
public class TestFragment extends Fragment implements OnRecyclerItemClickListener<Data>{
private RecyclerView mRecyclerView;
#Override
public void onItemClick(View view, int position, Data item) {
// do something
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.test_fragment, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
mRecyclerView = view.findViewById(idOfTheRecycler);
mRecyclerView .setAdapter(new CustomRecyclerAdapter(this));
}

If you want to add onClick() to the child view of items, for example, a button in item, I found that you can do it easily in onCreateViewHolder() of your own RecyclerView.Adapter just like this:
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater
.from(parent.getContext())
.inflate(R.layout.cell, null);
Button btn = (Button) v.findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//do it
}
});
return new MyViewHolder(v);
}
i don't know whether it's a good way, but it works well. If anyone has a better idea, very glad to tell me and correct my answer! :)

Here is a way to implement it quite easily if you have a list of POJOs and want to retrieve one on click from outside the adapter.
In your adapter, create a listener for the click events and a method to set it:
public class MyAdapter extends RecyclerView.Adapter<SitesListAdapter.ViewHolder> {
...
private List<MyPojo> mMyPojos;
private static OnItemClickListener mOnItemClickListener;
...
public interface OnItemClickListener {
public void onItemClick(MyPojo pojo);
}
...
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
mOnItemClickListener = onItemClickListener;
}
...
}
In your ViewHolder, implement onClickListener and create a class member to temporarily store the POJO the view is presenting, that way (this is an example, creating a setter would be better):
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public MyPojo mCurrentPojo;
...
public ViewHolder(View view) {
super(v);
...
view.setOnClickListener(this); //You could set this on part of the layout too
}
...
#Override
public void onClick(View view) {
if(mOnItemClickListener != null && mCurrentPojo != null){
mOnItemClickListener.onItemClick(mCurrentPojo);
}
}
Back in your adapter, set the current POJO when the ViewHolder is bound (or to null if the current view doesn't have one):
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
final MyPojo currentPojo = mMyPojos.get(position);
holder.mCurrentPojo = currentPojo;
...
That's it, now you can use it like this from your fragment/activity:
mMyAdapter.setOnItemClickListener(new mMyAdapter.OnItemClickListener() {
#Override
public void onItemClick(MyPojo pojo) {
//Do whatever you want with your pojo here
}
});

Yes you can
public ViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
//inflate the view
View view = LayoutInflator.from(parent.getContext()).inflate(R.layout.layoutID,null);
ViewHolder holder = new ViewHolder(view);
//here we can set onClicklistener
view.setOnClickListener(new View.OnClickListeener(){
public void onClick(View v)
{
//action
}
});
return holder;

This worked for me:
#Override
public void onBindViewHolder(PlacesListViewAdapter.ViewHolder holder, int position) {
----
----
----
// Set setOnClickListener(holder);
}
#Override
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
----
----
----
#Override
public void onClick(View view) {
// Use to get the item clicked getAdapterPosition()
}
}

Here you can handle multiple onclick see below code and it is very efficient
public class RVNewsAdapter extends RecyclerView.Adapter<RVNewsAdapter.FeedHolder> {
private Context context;
List<News> newsList;
// Allows to remember the last item shown on screen
private int lastPosition = -1;
public RVNewsAdapter(List<News> newsList, Context context) {
this.newsList = newsList;
this.context = context;
}
public static class FeedHolder extends RecyclerView.ViewHolder implements OnClickListener {
ImageView img_main;
TextView tv_title;
Button bt_facebook, bt_twitter, bt_share, bt_comment;
public FeedHolder(View itemView) {
super(itemView);
img_main = (ImageView) itemView.findViewById(R.id.img_main);
tv_title = (TextView) itemView.findViewById(R.id.tv_title);
bt_facebook = (Button) itemView.findViewById(R.id.bt_facebook);
bt_twitter = (Button) itemView.findViewById(R.id.bt_twitter);
bt_share = (Button) itemView.findViewById(R.id.bt_share);
bt_comment = (Button) itemView.findViewById(R.id.bt_comment);
img_main.setOnClickListener(this);
bt_facebook.setOnClickListener(this);
bt_twitter.setOnClickListener(this);
bt_comment.setOnClickListener(this);
bt_share.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v.getId() == bt_comment.getId()) {
Toast.makeText(v.getContext(), "Comment " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_facebook.getId()) {
Toast.makeText(v.getContext(), "Facebook " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_twitter.getId()) {
Toast.makeText(v.getContext(), "Twitter " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_share.getId()) {
Toast.makeText(v.getContext(), "share " , Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public FeedHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.feed_row, parent, false);
FeedHolder feedHolder = new FeedHolder(view);
return feedHolder;
}
#Override
public void onBindViewHolder(FeedHolder holder, int position) {
holder.tv_title.setText(newsList.get(position).getTitle());
// Here you apply the animation when the view is bound
setAnimation(holder.img_main, position);
}
#Override
public int getItemCount() {
return newsList.size();
}
/**
* Here is the key method to apply the animation
*/
private void setAnimation(View viewToAnimate, int position) {
// If the bound view wasn't previously displayed on screen, it's animated
if (position > lastPosition) {
Animation animation = AnimationUtils.loadAnimation(context, android.R.anim.slide_in_left);
viewToAnimate.startAnimation(animation);
lastPosition = position;
}
}
}

Modified my comment...
public class MyViewHolder extends RecyclerView.ViewHolder {
private Context mContext;
public MyViewHolder(View itemView) {
super(itemView);
mContext = itemView.getContext();
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int itemPosition = getLayoutPosition();
Toast.makeText(mContext, "" + itemPosition, Toast.LENGTH_SHORT).show();
}
});
}

Check this one in which I have implemented all the things with a proper way
RecyclerViewHolder Class
public class RecyclerViewHolder extends RecyclerView.ViewHolder {
//view holder is for girdview as we used in the listView
public ImageView imageView,imageView2;
public RecyclerViewHolder(View itemView) {
super(itemView);
this.imageView=(ImageView)itemView.findViewById(R.id.image);
}
}
Adapter
public class RecyclerView_Adapter extends RecyclerView.Adapter<RecyclerViewHolder> {
//RecyclerView will extend to recayclerview Adapter
private ArrayList<ModelClass> arrayList;
private Context context;
private static RecyclerViewClickListener itemListener;
//constructor of the RecyclerView Adapter
RecyclerView_Adapter(Context context,ArrayList<ModelClass> arrayList,RecyclerViewClickListener itemListener){
this.context=context;
this.arrayList=arrayList;
this.itemListener=itemListener;
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//this method will inflate the custom layout and return as viewHolder
LayoutInflater layoutInflater=LayoutInflater.from(parent.getContext());
ViewGroup mainGroup=(ViewGroup) layoutInflater.inflate(R.layout.single_item,parent,false);
RecyclerViewHolder listHolder=new RecyclerViewHolder(mainGroup);
return listHolder;
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, final int position) {
final ModelClass modelClass=arrayList.get(position);
//holder
RecyclerViewHolder mainHolder=(RecyclerViewHolder)holder;
//convert the drawable image into bitmap
Bitmap image= BitmapFactory.decodeResource(context.getResources(),modelClass.getImage());
//set the image into imageView
mainHolder.imageView.setImageBitmap(image);
//to handle on click event when clicked on the recyclerview item and
// get it through the RecyclerViewHolder class we have defined the views there
mainHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//get the position of the image which is clicked
itemListener.recyclerViewListClicked(v,position);
}
});
}
#Override
public int getItemCount() {
return (null!=arrayList?arrayList.size():0);
}
}
The interface
public interface RecyclerViewClickListener {
//this is method to handle the event when clicked on the image in Recyclerview
public void recyclerViewListClicked(View v,int position);
}
//and to call this method in activity
RecyclerView_Adapter adapter=new RecyclerView_Adapter(Wallpaper.this,arrayList,this);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
#Override
public void recyclerViewListClicked(View v,int position){
imageView.setImageResource(wallpaperImages[position]);
}

Access the mainView of rowLayout(cell) for you RecyclerView and in your OnBindViewHolder write this code:
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
Movie movie = moviesList.get(position);
holder.mainView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
System.out.println("pos " + position);
}
});
}

it worked for me. Hope it will help. Most simplest way.
Inside View Holder
class GeneralViewHolder extends RecyclerView.ViewHolder {
View cachedView = null;
public GeneralViewHolder(View itemView) {
super(itemView);
cachedView = itemView;
}
Inside OnBindViewHolder()
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
final GeneralViewHolder generalViewHolder = (GeneralViewHolder) holder;
generalViewHolder.cachedView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, "item Clicked at "+position, Toast.LENGTH_SHORT).show();
}
});
And let me know, do you have any question about this solution ?

main_recyclerview.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
int position=rv.getChildAdapterPosition(rv.findChildViewUnder(e.getX(),e.getY()));
switch (position)
{
case 0:
{
wifi(position);
adapter2.notifyDataSetChanged();
}
break;
case 1:
{
sound(position);
adapter2.notifyDataSetChanged();
}
break;
case 2:
{
bluetooth(position);
adapter2.notifyDataSetChanged();
}
break;
}
return true;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e)
{
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});

Instead of implementing interface View.OnClickListener inside view holder or creating and interface and implementing interface in your activity..
I used this code for simple on OnClickListener implementation.
public static class SimpleStringRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleStringRecyclerViewAdapter.ViewHolder> {
// Your initializations goes here...
private List<String> mValues;
public static class ViewHolder extends RecyclerView.ViewHolder {
//create a variable mView
public final View mView;
/*All your row widgets goes here
public final ImageView mImageView;
public final TextView mTextView;*/
public ViewHolder(View view) {
super(view);
//Initialize it here
mView = view;
/* your row widgets initializations goes here
mImageView = (ImageView) view.findViewById(R.id.avatar);
mTextView = (TextView) view.findViewById(android.R.id.text1);*/
}
}
public String getValueAt(int position) {
return mValues.get(position);
}
public SimpleStringRecyclerViewAdapter(Context context, List<String> items) {
mBackground = mTypedValue.resourceId;
mValues = items;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false);
view.setBackgroundResource(mBackground);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mBoundString = mValues.get(position);
holder.mTextView.setText(mValues.get(position));
//Here it is simply write onItemClick listener here
holder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, ExampleActivity.class);
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return mValues.size();
}
}

use PlaceHolderView
#Layout(R.layout.item_view_1)
public class View1{
#View(R.id.txt)
public TextView txt;
#Resolve
public void onResolved() {
txt.setText(String.valueOf(System.currentTimeMillis() / 1000));
}
#Click(R.id.btn)
public void onClick(){
txt.setText(String.valueOf(System.currentTimeMillis() / 1000));
}
}

I wrote a library to handle android recycler view item click event. You can find whole tutorial in https://github.com/ChathuraHettiarachchi/RecycleClick
RecycleClick.addTo(YOUR_RECYCLEVIEW).setOnItemClickListener(new RecycleClick.OnItemClickListener() {
#Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
// YOUR CODE
}
});
or to handle item long press you can use
RecycleClick.addTo(YOUR_RECYCLEVIEW).setOnItemLongClickListener(new RecycleClick.OnItemLongClickListener() {
#Override
public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {
// YOUR CODE
return true;
}
});

recyclerview animation has not been tested, the other is normal. I think it has been optimized to the maximum. Interface has other uses, you can temporarily ignore.
public abstract class BaseAdapterRV<VH extends BaseViewHolder> extends RecyclerView.Adapter<VH> implements AdapterInterface {
public final String TAG = getClass().getSimpleName();
protected final Activity mActivity;
protected final LayoutInflater mInflater;
protected ItemClickInterface<?, Integer> mListener;
public BaseAdapterRV(Activity activity) {
mActivity = activity;
mInflater = LayoutInflater.from(mActivity);
}
#Override
public final VH onCreateViewHolder(ViewGroup parent, int viewType) {
return onCreateViewHolder(parent, viewType, mInflater);
}
#Override
public final void onBindViewHolder(VH holder, int position) {
holder.itemView.setTag(R.id.tag_view_click, position);
//创建点击事件
holder.itemView.setOnClickListener(mListener);
holder.itemView.setOnLongClickListener(mListener);
onBindVH(holder, position);
}
///////////////////////////////////////////////////////////////////////////
// 以下是增加的方法
///////////////////////////////////////////////////////////////////////////
/**
* 注意!涉及到notifyItemInserted刷新时立即获取position可能会不正确
* 里面也有onItemLongClick
*/
public void setOnItemClickListener(ItemClickInterface<?, Integer> listener) {
mListener = listener;
notifyDataSetChanged();
}
#NonNull
protected abstract VH onCreateViewHolder(ViewGroup parent, int viewType, LayoutInflater inflater);
protected abstract void onBindVH(VH holder, int position);
}
This is Interface
/**
* OnItemClickListener的接口
* 见子类实现{#link OnItemClickListener}{#link OnItemItemClickListener}
*/
public interface ItemClickInterface<DATA1, DATA2> extends View.OnClickListener, View.OnLongClickListener {
void onItemClick(DATA1 data1, DATA2 data2);
boolean onItemLongClick(DATA1 data1, DATA2 data2);
}
This is an abstract class
public abstract class OnItemClickListener<DATA> implements ItemClickInterface<View, DATA> {
#Override
public void onClick(View v) {
onItemClick(v, (DATA) v.getTag(R.id.tag_view_click));
}
#Override
public boolean onLongClick(View v) {
return onItemLongClick(v, (DATA) v.getTag(R.id.tag_view_click));
}
#Override
public boolean onItemLongClick(View view, DATA data) {
return false;
}
}
You only need it
mAdapter.setOnItemClickListener(new OnItemClickListener<Integer>() {
#Override
public void onItemClick(View view, Integer integer) {
}
#Override
public boolean onItemLongClick(View view, Integer integer) {
return true;
}
});

I found one of the shortest ways using androidx lifecycle mutable live data
Adapter:
private val onItemClickListener = MutableLiveData<YourAdapterItem>()
override fun onBindViewHolder(holder: GifsViewHolder, position: Int) {
holder.itemView.setOnClickListener { onItemClickListener.value = gifs[position] }
}
fun getOnItemClickListener(): MutableLiveData<Gif> {
return onItemClickListener
}
anywhere in MainActivity
yourFancyAdapter.getOnItemClickListener().observe(this, Observer {
println(it)
})