Develop Reference

How can I show/hide a layout in the main activity from a RecyclerView in android studio java?

I have an activity which consists of a recycler view for generating buttons (from a different layout file) and a layout with elements for confirmation.
I want to make it so when I click on the button "NEW GAME" (in the Recyclerview class), the confirmationLayout (in the MainMenu Activity) shows. But I can't, can someone help me?
MainMenu Class
public class MainMenu extends AppCompatActivity {
private ImageView profileIcon;
private TextView username;
private RelativeLayout newGameConfirmationLayout;
private TextView yesButton, noButton;
private RecyclerView buttonRecyclerView;
private ButtonRecyclerAdapter adapter;
private DataHandler dataHandler;
private ArrayList<String> buttonNames = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
newGameConfirmationLayout = findViewById(R.id.newGameConfirmationLayout);
yesButton = findViewById(R.id.yesButton);
noButton = findViewById(R.id.noButton);
buttonRecyclerView = findViewById(R.id.buttonRecyclerView);
buttonRecyclerView.setLayoutManager(new LinearLayoutManager(MainMenu.this));
if(General.infoSaved){buttonNames.add("CONTINUE GAME");}
buttonNames.add("NEW GAME");
buttonNames.add("CHANGE USER");
buttonNames.add("PRACTICE");
buttonNames.add("EXERCISE LIST");
adapter = new ButtonRecyclerAdapter(buttonNames, MainMenu.this);
buttonRecyclerView.setAdapter(adapter);
yesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startGame();
}
});
noButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
newGameConfirmationLayout.setVisibility(View.INVISIBLE);
}
});
}
private void startGame(){}
public void show_confirmationLayout(){
newGameConfirmationLayout.setVisibility(View.VISIBLE);
}
RecyclerView Class
public class ButtonRecyclerAdapter extends RecyclerView.Adapter<ButtonRecyclerAdapter.buttonHolder>{
private ArrayList<String> buttonNames;
private Context context;
public ButtonRecyclerAdapter(ArrayList<String> loginButtonNames, Context context) {
this.buttonNames = loginButtonNames;
this.context = context;
}
#NonNull
#Override
public buttonHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.button_block,parent,false);
return new buttonHolder(view);
}
#Override
public void onBindViewHolder(#NonNull buttonHolder holder, int position) {
holder.button.setText(buttonNames.get(position));
holder.button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String buttonName = holder.button.getText().toString();
switch (buttonName){
case "NEW GAME":
MainMenu mainMenu = new MainMenu();
mainMenu.show_confirmationLayout();
break;
}
}
});
}
#Override
public int getItemCount() {
return buttonNames.size();
}
public class buttonHolder extends RecyclerView.ViewHolder{
private Button button;
public buttonHolder(#NonNull View itemView) {
super(itemView);
button = itemView.findViewById(R.id.buttonblock);
}
}
}
I tried adding it as a class (as above) but I get the error that the layout is a null object / However when I try to write the ame line of code directly in the activity it works.

There's a method I personally use in my RecyclerView's Adapter and ViewHolder is to set the width and height of your item's ViewGroup to 0.
Here's the method you can add to your adapter class which takes item position that you want to hide:
public void hideFeedItem(int position){
RecyclerView.ViewHolder holder = getViewHolderAtPosition(position);
if(holder != null){
ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();
params.height=0;
params.width= 0;
holder.itemView.setLayoutParams(params);
}
}
Where itemview is the root ViewGroup that should be already defined in your ViewHolder in your case should be buttonHolder.

My list always Null. What am I doing wrong?

I am doing some kind of Medication Reminder App for our school and I am trying to create an Expandable RecyclerView based on a video I watch and practically followed step by step. Did everything practically the same but we created a Database instead of just fixed values. The problem I have is that after initializing in the Main Activity, my list value is always Null and that my adapter is returning a NULL. What am I doing wrong?
Here is my code.
MediReminders.java
I've decided to remove this because its just a bunch of getters and setters
MedAdapters.java
public class MedAdapters extends RecyclerView.Adapter<MedAdapters.MediRemindersVH> {
List<MediReminders> MedList;
public MedAdapters(List<MediReminders> MedList) {
this.MedList = MedList;
}
#NonNull
#Override
public MedAdapters.MediRemindersVH onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row,parent,false);
return new MediRemindersVH(view);
}
#Override
public void onBindViewHolder(#NonNull MedAdapters.MediRemindersVH holder, int position) {
MediReminders mediReminders = MedList.get(position);
holder.med_nameTxt.setText(mediReminders.getMed_name());
holder.med_typeTxt.setText(mediReminders.getMed_type());
holder.fromdatedetailTxt.setText(mediReminders.getFromDatedetail());
holder.todatedetailTxt.setText(mediReminders.getToDatedetail());
holder.timedetailTxt.setText(mediReminders.getTimedetail());
holder.whendetailTxt.setText(mediReminders.getWhendetail());
holder.notesdetailTxt.setText(mediReminders.getNotesdetail());
boolean isExpandable = MedList.get(position).isExpandable();
holder.expandableLayout.setVisibility(isExpandable ? View.VISIBLE : View.GONE);
}
#Override
public int getItemCount() {
return MedList.size();
}
public class MediRemindersVH extends RecyclerView.ViewHolder {
TextView med_nameTxt, med_typeTxt, fromdatedetailTxt, todatedetailTxt, timedetailTxt, whendetailTxt, notesdetailTxt;
LinearLayout linearLayout;
RelativeLayout expandableLayout;
public MediRemindersVH(#NonNull View itemView) {
super(itemView);
med_nameTxt = itemView.findViewById(R.id.medname);
med_typeTxt = itemView.findViewById(R.id.auto_complete_txt);
fromdatedetailTxt = itemView.findViewById(R.id.fromdate);
todatedetailTxt = itemView.findViewById(R.id.todate);
timedetailTxt = itemView.findViewById(R.id.datetime);
whendetailTxt = itemView.findViewById(R.id.radioGroup);
notesdetailTxt = itemView.findViewById(R.id.notes);
linearLayout = itemView.findViewById(R.id.linear_layout);
expandableLayout = itemView.findViewById(R.id.expandable_layout);
linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
MediReminders mediReminders = MedList.get(getAdapterPosition());
mediReminders.setExpandable(!mediReminders.isExpandable());
notifyItemChanged(getAdapterPosition());
}
});
}
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
List<MediReminders> MedList;
MedAdapters adapter = new MedAdapters(MedList);
ImageButton addNewButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
recyclerView = findViewById(R.id.MedList);
setContentView(R.layout.activity_main_list);
initData();
setRecyclerView();
}
private void setRecyclerView () {
//problem is specifically this one...
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
}
private void initData () {
MedList = new ArrayList<>();
MedList.add(new MediReminders("Paracetamol", "Tablet", "Apr 26, 2022", "May 9,2022", "6:30 PM", "Before Meal", "Take in water first"));
}
}

First, Try to check your application with Fixed hard coded values.
If it's working fine.
Second, run and check your database query on some dbms tool.

How to sort recycler view SQLite content

I have a a view where a bunch of my Sqlite data is displayed. I recently added a column to my database called location_position. I have added a button to my relative layout so that when its clicked I want the data inside to be sorted in ascending format. I have tried following a few examples online but with the way my app is setup im struggling tom get it to work.
I have a routeView.java class and a routeAdapter
I would really apreciate if someone can show me how to have the content sorted when the button is clicked, or any resources with similar solutions
public class RouteView extends AppCompatActivity {
RecyclerView recyclerView;
routeAdapter routeAdapter;
ArrayList<String> location_id, location_name, location_county, location_description, location_route, location_position;
MyDatabaseHelper myDB;
Button createPDFButton, btnNorth, southBtn;
Context mContext = this;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_route_view);
Button southBtn = findViewById(R.id.button_south);
southBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Collections.sort(ArrayList);
}
});
// btnRemove = findViewById(R.id.btnRemove);
recyclerView = findViewById(R.id.recyclerView);
myDB = new MyDatabaseHelper(this);
createPDFButton = findViewById(R.id.createPDFButton);
location_id = new ArrayList<>();
location_name = new ArrayList<>();
location_county = new ArrayList<>();
location_description = new ArrayList<>();
location_route = new ArrayList<>();
location_position = new ArrayList<>();
Cursor cursor = myDB.readAllData();
createPDFButton.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
#Override
public void onClick(View v) {
if (UserActivity.checkAppPermission(RouteView.this, "android.permission.WRITE_EXTERNAL_STORAGE", 1)){
generatePDF(recyclerView);
}
}
});
while (cursor.moveToNext()){
if(cursor.getString(4).equals("1")) {
location_id.add(cursor.getString(0));
location_name.add(cursor.getString(1));
location_county.add(cursor.getString(2));
location_description.add(cursor.getString(3));
location_route.add(cursor.getString(4));
location_position.add(cursor.getString(8));
}
}
routeAdapter = new routeAdapter(this, this, location_id, location_name, location_county, location_description, location_route, location_position);
recyclerView.setAdapter(routeAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
}
and this is the route adapter class
public class routeAdapter extends RecyclerView.Adapter<routeAdapter.MyViewHolder> {
//private final ClickListener listener;
private Context context;
MyDatabaseHelper myDB;
Activity activity;
private ArrayList location_id, location_name, location_county, location_description, location_position, location_route, location_image_url;
Button btnRemove;
String id, name, county, description;
routeAdapter(Activity activity, Context context, ArrayList location_id, ArrayList location_name, ArrayList location_county,
ArrayList location_description, ArrayList location_route, ArrayList location_position){
this.activity = activity;
this.context = context;
this.location_id = location_id;
this.location_name = location_name;
this.location_county = location_county;
this.location_description = location_description;
this.location_position = location_position;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.route_row, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, final int position) {
holder.location_id_txt.setText(String.valueOf(location_id.get(position)));
holder.location_name_txt.setText(String.valueOf(location_name.get(position)));
holder.location_county_txt.setText(String.valueOf(location_county.get(position)));
holder.location_description_txt.setText(String.valueOf(location_description.get(position)));
holder.mainLayout2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context, RouteView.class);
intent.putExtra("id", String.valueOf(location_id.get(position)));
intent.putExtra("name", String.valueOf(location_name.get(position)));
intent.putExtra("county", String.valueOf(location_county.get(position)));
intent.putExtra("description",String.valueOf(location_description.get(position)));
activity.startActivityForResult(intent, 2);
}
});
}
#Override
public int getItemCount() { return location_id.size(); }
class MyViewHolder extends RecyclerView.ViewHolder {
TextView location_id_txt, location_name_txt, location_county_txt, location_description_txt, added_to_route_txt, location_image_url;
LinearLayout mainLayout2;
Button btnRemove;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
location_id_txt = itemView.findViewById(R.id.location_id_txt);
location_name_txt = itemView.findViewById(R.id.location_name_txt);
location_county_txt = itemView.findViewById(R.id.location_county_txt);
location_description_txt = itemView.findViewById(R.id.location_description_txt);
mainLayout2 = itemView.findViewById(R.id.mainLayout2);
}
}
}

This is the basic concept:
On clicking a button or whatever to sort the things in a specific order, you sort the ArrayList that contains the values reflected in the RecyclerView. Then you update/ recreate the RecyclerView to register the changes.

How to show an onClick message when clicking on an item of my RecyclerView list?

I am actually working on a group project and I want to develop a functionnality for our application. My goal is to have a list of several items with their images and when I click on an Item of that list I want to have a text pop in the midle of the screen related to that particular item. I'm afraid I might be using the wrong technical Tools to do so. I am actually using a csv file for the list details, an adapter and a viewHolder for the list. Since I have no idea on what is wrong and what to do I link a big part of my code so you can check how I did until now. I can also give you my xml files if you need to check them out, a really big thanks in advance to all the answers and time spent on my problem
I already managed to have my list of items with the title and the picture (text from csv file) of each list item but I'm stuck on how to show a specific text for each ViewHolder.
this is my Adapter
public class Adapter extends RecyclerView.Adapter<ViewHolder> {
List<Departement> list;
Activity activity;
public Adapter(List<Departement> list, Activity activity) {
this.list = list;
this.activity = activity;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int itemType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.departement,viewGroup,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
Departement departement = list.get(position);
viewHolder.bind(departement, activity);
}
#Override
public int getItemCount() {
return list.size();
}
}
my ViewHolder
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView textViewView;
private ImageView imageView;
public ViewHolder(View itemView) {
super(itemView);
textViewView = (TextView) itemView.findViewById(R.id.text);
imageView = (ImageView) itemView.findViewById(R.id.image);
}
public void bind(Departement departement, Activity activity){
textViewView.setText(departement.getText());
String uri = departement.getImageUrl();
int imageResource = activity.getResources().getIdentifier(uri, null, activity.getPackageName());
Drawable res = activity.getResources().getDrawable(imageResource);
imageView.setImageDrawable(res);
}
}
each item of the list is a Departement
public class Departement {
private String text;
private String imageUrl;
public Departement(String text, String imageUrl) {
this.text = text;
this.imageUrl = imageUrl;
}
public String getText() {
return text;
}
public String getImageUrl() {
return imageUrl;
}
public void setText(String text) {
this.text = text;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
}
and finally my fragment
public class FragmentEspecesProches extends Fragment {
public final static char SEPARATOR=',';
private RecyclerView recyclerView;
private List<Departement> departementsList = new ArrayList<>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View view = inflater.inflate(R.layout.fragment_especes_proches, container, false);
ajouterDepartements();
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new GridLayoutManager(this,2));
recyclerView.setAdapter(new Adapter(departementsList, getActivity()));
return view;
}
private void ajouterDepartements() {
ArrayList<String> lines = new ArrayList<>();
ArrayList<String[]> data = new ArrayList<>();
String sep = new Character(SEPARATOR).toString();
lines = UtilitaireResultat.readFile(getActivity().getResources().openRawResource(R.raw.departement));
for(String line : lines){
String[] oneData = line.split(sep);
data.add(oneData);
}
for(int i=0 ; i<data.size() ; i++){
String[] tabStr = data.get(i);
departementsList.add( new Departement( tabStr[2]+" - "+tabStr[3] ,"#drawable/"+tabStr[5] ));
}
}
}

you can implement item click listener like this
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView tvName;
public TextView tvHometown;
private Context context;
public ViewHolder(Context context, View itemView) {
super(itemView);
this.tvName = (TextView) itemView.findViewById(R.id.tvName);
this.tvHometown = (TextView) itemView.findViewById(R.id.tvHometown);
// Store the context
this.context = context;
// Attach a click listener to the entire row view
itemView.setOnClickListener(this);
}
// Handles the row being being clicked
#Override
public void onClick(View view) {
int position = getAdapterPosition(); // gets item position
// if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
User user = users.get(position);
// We can access the data within the views
Toast.makeText(context, tvName.getText(), Toast.LENGTH_SHORT).show();
// }
}
}

Use onBindViewHolder to handle any interaction on your list items
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
Departement departement = list.get(position);
viewHolder.bind(departement, activity);
viewHolder.itemView.setOnClickListener(//your action//);
}
ItemView is the whole item; you can access your textviews or imageviews as you use it on your bind method,
You can use your bind method to apply listeners.

Handle on click of the item inside your ViewHolder constructor
like ,
public ViewHolder(View itemView) {
super(itemView);
textViewView = (TextView) itemView.findViewById(R.id.text);
imageView = (ImageView) itemView.findViewById(R.id.image);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position=getAdapterPosition();
Toast.makeText(context, list.get(position).getText(), Toast.LENGTH_SHORT).show();
}
});
}

Create your onClickListner interface as
interface RecylerViewItemClickListner
{
void onItemClick(Department item)
}
set the listner in Adapter class
private final RecylerViewItemClickListner mOnClickListener;
public Adapter(List<Departement> list, Activity activity) {
this.list = list;
this.activity = activity;
this.mOnClickListener = activity;
}
Now in ViewHolder class
public void bind(final Departement item, final mOnClickListener listener) {
itemView.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
mOnClickListener.onItemClick(item);
}
});
}
and change onBindViewHolder as below
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.bind(items.get(position), mOnClickListener);
}
Override onItemClick(Department item) in activity
#override
onItemClick(Department item)
{
//show toast here...
}

implement OnClickListener in your ViewHolder class
public class ViewHolder extends RecyclerView.ViewHolder implements
View.OnClickListener
{
#Override
public void onClick(View v)
{
//do action
}
}

Implement below method in your ViewHolder class.
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final User currentItem = users.get(getAdapterPosition());
Toast.makeText(mContext,currentItem.getText()+" is selected!",Toast.LENGTH_SHORT).show();
}
});

Passing RecyclerView CardView Clicked Item Data To Activity

I have a question about passing clicked cardview data to activity, and here the full story :
I have an Activity called "Details", which contains 2 TextViews in it's layout, Title & Description .
I have setup a fragment ( tab_1 ) which contain the recyclerview codes and the the items data, each item of those contain : title & description .
What i want :
When the user click the item, it will open the Details Activity, and change Details layout title, with clicked item title, and the same for description .
I've manged to create the other activity as an example, and made intent to start it, plus adding "addOnTouchlistener" thanks to Stackoverflow, i've found the way to make it .
So, how to make this alive? I've tried many ways of the available answers on Stackoverflow, but all of them not working, or not related to my request .
Here are my files :
itemsdata.java :
public class itemsdata {
int CatPic;
String title;
String Descr;
int Exapnd;
int expand_no;
tab_1.java ( fragment )
public class tab_1 extends Fragment implements SearchView.OnQueryTextListener {
private RecyclerView mRecyclerView;
public RecyclingViewAdapter adapter;
private Activity context;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.tab_1, container, false);
mRecyclerView = (RecyclerView)layout.findViewById(R.id.recycler_view);
mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener
(getContext(), new RecyclerItemClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
Intent i = new Intent(view.getContext(), DetailsActivity.class);
view.getContext().startActivity(i);
}
}));
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
adapter = new RecyclingViewAdapter(getActivity(),Listed());
mRecyclerView.setAdapter(adapter);
return layout;
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
}
#Override
public boolean onQueryTextChange(String query) {
final List<itemsdata> filteredModelList = filter(Listed(), query);
adapter.animateTo(filteredModelList);
mRecyclerView.scrollToPosition(0);
return true;
}
#Override
public boolean onQueryTextSubmit(String query) {
return true;
}
private List<itemsdata> filter(List<itemsdata> models, String query) {
query = query.toLowerCase();
final List<itemsdata> filteredModelList = new ArrayList<>();
for (itemsdata model : models) {
final String text = model.title.toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
public List<itemsdata> Listed()
{
//Titles Strings
String sys_title1 = getString(R.string.system_item_title_1);
String sys_title2 = getString(R.string.system_item_title_2);
String sys_title3 = getString(R.string.system_item_title_3);
//Description Strings
String sys_descr1 = getString(R.string.system_item_desc_1);
String sys_descr2 = getString(R.string.system_item_desc_2);
String sys_descr3 = getString(R.string.system_item_desc_3);
//Adding New Cards
List<itemsdata> data = new ArrayList<>();
//Categories Icons New Items ** Make It The Same
int[] icons = {
R.drawable.facebook_icon ,
R.drawable.twitter_icon ,
R.drawable.twitter_icon
};
//Expand Button New Items
int[] expandbutton = {
R.drawable.expanded ,
R.drawable.expanded ,
R.drawable.expanded
};
//UnExpand Button New Items
int[] unexpandbutton = {
R.drawable.ca_expand ,
R.drawable.ca_expand ,
R.drawable.ca_expand
};
//Titles New Items
String[] titles = {
sys_title1 ,
sys_title2 ,
sys_title3
};
//Description New Items
String[] Description = {
sys_descr1 ,
sys_descr2 ,
sys_descr3
};
for(int i = 0;i<titles.length && i < icons.length && i < Description.length && i < unexpandbutton.length && i < expandbutton.length ; i++)
{
itemsdata current = new itemsdata();
current.CatPic = icons[i];
current.title = titles[i];
current.Descr = Description[i];
current.expand_no = unexpandbutton[i];
current.Exapnd = expandbutton[i];
data.add(current);
}
return data;
}
}
Details Activity :
public class DetailsActivity extends AppCompatActivity{
TextView title;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details);
title = (TextView)findViewById(R.id.details_title);
}
EDIT : I've made it, i have added a button which open the fragment, and passed the data, in the Adapter, but i want it via tab_1.java, not the Adapter, i mean i want to click on the item to open the fragment, not on a button, here a snap from my Adapter code ( i've added it in OnBindViewHolder )
I've setup a OnClick and implemented the Vew.setOnClick ..etc, but when i click the item, nothing happen.
#Override
public void onBindViewHolder(final MyRecycleViewHolder holder, int position) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(v.getContext(),DetailsActivity.class);
v.getContext().startActivity(i);
}
});
//Referencing Data
final itemsdata currentobject = mdata.get(position);
//Referencing Items
holder.ProbTitle.setText(currentobject.title);
holder.ProbDescr.setText(currentobject.Descr);
holder.CategoryPic.setImageResource(currentobject.CatPic);
holder.ExpandButton.setImageResource(currentobject.Exapnd);
holder.ExpandNoButton.setImageResource(currentobject.expand_no);
//What Happen When You Click Expand Button .
holder.ExpandButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(v.getContext(), DetailsActivity.class);
i.putExtra("TitleKey",holder.ProbTitle.getText().toString());
v.getContext().startActivity(i);
}
}
);
public static class MyRecycleViewHolder extends RecyclerView.ViewHolder
{
SwipeLayout swipeLayout;
//Defining Items .
TextView ProbTitle;
ImageButton ExpandButton;
TextView ProbDescr;
ImageButton ExpandNoButton;
ImageView CategoryPic;
/*
TextView Card_Star;
TextView Card_UnStar;
*/
TextView Card_Share;
//Referencing Resources
public MyRecycleViewHolder(final View itemView) {
super(itemView);
ProbTitle = (TextView) itemView.findViewById(R.id.prob_title);
CategoryPic = (ImageView) itemView.findViewById(R.id.cat_pic);
ProbDescr = (TextView) itemView.findViewById(R.id.prob_descr);
ExpandButton = (ImageButton) itemView.findViewById(R.id.expand_button);
ExpandNoButton = (ImageButton) itemView.findViewById(R.id.expand_no_button);
/*
Card_Star = (TextView) itemView.findViewById(R.id.card_star);
Card_UnStar = (TextView) itemView.findViewById(R.id.card_unstar);
*/
Card_Share = (TextView) itemView.findViewById(R.id.card_share);
swipeLayout = (SwipeLayout) itemView.findViewById(R.id.swipe);
}

create an Interface inside your adapter containing methods. And while implementing your Adapter, those methods will be implemented in your activity and you can perform whatever action you want.
public class Adapter extends RecyclerView.Adapter<MyRecycleViewHolder> {
public interface Callbacks {
public void onButtonClicked(String titleKey);
}
private Callbacks mCallbacks;
public Adapter() {
}
#Override
public MyRecycleViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_details, null);
return new MyRecycleViewHolder(v);
}
#Override
public void onBindViewHolder(final MyRecycleViewHolder holder, final int i) {
holder.ExpandButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mCallbacks != null) {
mCallbacks.onButtonClicked(holder.ProbTitle.getText().toString());
}
}
});
}
#Override
public int getItemCount() {
return;
}
public void setCallbacks(Callbacks callbacks) {
this.mCallbacks = callbacks;
}
}

you may try do this on your onItemClick()
Intent i = new Intent(view.getContext(), DetailsActivity.class);
i.putExtra("title", yourTitle);
i.putExtra("description", yourDescription);
view.getContext().startActivity(i);
and when oncreate in your DetailActivity,do this
String title = getIntent().getStringExtra("title");
String description = getIntent().getStringExtra("description");
so you can pass title and description to DetailActivity

IMO, you implement setOnClickListener inside Adapter of RecyclerView. You can refer to my following sample code, then apply its logic to your code. Hope it helps!
public class MyRVAdapter extends RecyclerView.Adapter<MyRVAdapter.ViewHolder> {
Context mContext;
List<String> mStringList;
public MyRVAdapter(Context mContext, List<String> mStringList) {
this.mContext = mContext;
this.mStringList = mStringList;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView textView1 = (TextView) v.findViewById(R.id.textView1);
TextView textView2 = (TextView) v.findViewById(R.id.textView2);
Bundle bundle = new Bundle();
bundle.putString("key1", textView1.getText().toString());
bundle.putString("key2", textView2.getText().toString());
passToAnotherActivity(bundle);
}
});
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// do something...
}
#Override
public int getItemCount() {
if (mStringList != null) {
return mStringList.size();
}
return 0;
}
private void passToAnotherActivity(Bundle bundle) {
if (mContext == null)
return;
if (mContext instanceof MainActivity) {
MainActivity activity = (MainActivity) mContext;
activity.passToAnotherActivity(bundle); // this method must be implemented inside `MainActivity`
}
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ViewHolder(View itemView) {
super(itemView);
// do something...
}
#Override
public void onClick(View v) {
}
}
}

First of all make your "itemsdata" object to implement Parcelable. You can check it here . In your onItemClick method you pass the object to your Details activity using intent.putExtra("key",listOfDataItems.get(position));
In your DetailsActivity you can get your custom object with getParcelable("key")

All above methods worked, but kinda long, so this one worked for me :
Cardview cardview;
cardView = (CardView)itemView.findViewById(R.id.cv);
cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent (view.getContext(), DetailsActivity.class);
i.putExtra("TitleKey",ProbTitle.getText().toString());
i.putExtra("DescrKey",ProbDescr.getText().toString());
view.getContext().startActivity(i);
}
});
And in Details.java :
TextView title;
TextView Descr;
title = (TextView)findViewById(R.id.details_title);
Descr = (TextView)findViewById(R.id.details_descr);
String titleresult = result.getExtras().getString("TitleKey");
String Descrresult = result.getExtras().getString("DescrKey");
title.setText(titleresult);
Descr.setText(Descrresult);