Good morning, I have a problem trying to link a Recyclerview with another Recyclerview, I mean one within others, the first recyclerview is in my activity, which in turn is filler for a second recyclerview, which is in a LinearLayout, since Once that recyclerview is filled by another layout that has an ImageView and a TextView, the problem is that I can not use the two recycler view since the app stops, but if I use the layout separately if they work in the same way, I know if I explain, I have 3 layouts which are:
The problem is that I can not use both recycler view since the app stops, but if I use the layout separately if they work in the same way, I do not know if I explain myself, I have 3 layouts, the one in the activity that contains a recyclerview, the container of the elements that contains the second recyclerview and a texview, and finally the layout portraitLayout that contains an imageView and a texView, if I only use the layout of the activity, the second one is rendered well but without any image, and if I remove the layout of the activity and leave the second with the third this is rendered with their respective images.
I have 2 adapters which are:
AdapterPortrait:
`public class Adapter_Portrait extends RecyclerView.Adapter<Adapter_Portrait.ViewHolder> {
private List<Portrait> portraits;
private int layout;
private OnItemClickListener listener;
private Context context;
public Adapter_Portrait(List<Portrait> portraits, int layout, OnItemClickListener listener) {
this.portraits = portraits;
this.layout = layout;
this.listener = listener;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(this.layout,parent,false);
ViewHolder vh=new ViewHolder(v);
context=parent.getContext();
return vh;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.bind(portraits.get(position),this.listener);
}
#Override
public int getItemCount() {
return portraits.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView imageView;
TextView textView;
public ViewHolder(View itemView) {
super(itemView);
this.imageView = itemView.findViewById(R.id.imagePortrait);
this.textView = itemView.findViewById(R.id.textNamePortrait);
}
public void bind(final Portrait portrait, final OnItemClickListener listener){
this.textView.setText(portrait.getName_portrait());
Picasso.with(context).load(portrait.getImagePortrait()).fit().into(imageView);
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
listener.onItemClick(portrait, getAdapterPosition());
}
});
}
}
public interface OnItemClickListener{
void onItemClick(Portrait portrait, int position);
}
}`
AdapterList_Pieces:
`public class AdapterList_Pieces extends
RecyclerView.Adapter<AdapterList_Pieces.ViewHolder> {
private List<Artist> artists;
private int layout;
private OnItemClickListener listener;
private Context context;
public AdapterList_Pieces(List<Artist> artists, int layout, OnItemClickListener listener) {
this.artists = artists;
this.layout = layout;
this.listener = listener;
}
public class ViewHolder extends RecyclerView.ViewHolder{
RecyclerView recyclerView;
TextView textView;
public ViewHolder(View itemView) {
super(itemView);
this.recyclerView = itemView.findViewById(R.id.RecyclerViewPieces);
this.textView = itemView.findViewById(R.id.textViewPieces);
}
public void bind(final Artist artist, final OnItemClickListener listener){
this.textView.setText(artist.getName_artist());
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
listener.onItemClick(artist, getAdapterPosition());
}
});
}
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(this.layout,parent,false);
ViewHolder vh=new ViewHolder(v);
context=parent.getContext();
return vh;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.bind(artists.get(position),this.listener);
}
#Override
public int getItemCount() {
return artists.size();
}
public interface OnItemClickListener{
void onItemClick(Artist artist, int position);
}
}`
My Activity is:
public class PiecesActivity extends AppCompatActivity {
List<Artist> artists;
List<Portrait> portraits;
RecyclerView recyclerView;
RecyclerView recyclerViewPiece;
RecyclerView.Adapter rAdapter;
RecyclerView.LayoutManager layoutManagerPiece;
RecyclerView.Adapter AdapterPiece;
RecyclerView.LayoutManager layoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.portraitcontenetorslayout);
recyclerView= findViewById(R.id.recyclerViewListPieces);
recyclerViewPiece= findViewById(R.id.RecyclerViewPieces);
artists= ConsultingInformation.getArtist();
portraits= ConsultingInformation.getPortrait();
layoutManager = new LinearLayoutManager(this);
layoutManagerPiece = new LinearLayoutManager(this);
rAdapter= new Adapter_Portrait(portraits,R.layout.portraitlayout, new Adapter_Portrait.OnItemClickListener(){
#Override
public void onItemClick(Portrait portrait, int position) {
Toast.makeText(PiecesActivity.this, "This piece is "+ portraits.get(position).getName_portrait(), Toast.LENGTH_LONG).show();
}
});
recyclerViewPiece.setHasFixedSize(true);
recyclerViewPiece.setItemAnimator(new DefaultItemAnimator());
recyclerViewPiece.setLayoutManager(layoutManagerPiece);
recyclerViewPiece.setAdapter(rAdapter);
AdapterPiece= new AdapterList_Pieces(artists,R.layout.portraitcontenetorslayout, new AdapterList_Pieces.OnItemClickListener(){
#Override
public void onItemClick(Artist artist, int positionArt) {
Toast.makeText(PiecesActivity.this, "This list of pieces is "+ artists.get(positionArt).getName_artist(), Toast.LENGTH_LONG).show();
}
});
recyclerView.setHasFixedSize(true);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(AdapterPiece);
}
}`
I had read that it was not possible to put a list downloadble within another, but i did not get an unstable method for my case that are two list of objects one within another.
My layouts just in case.
PortraitLayout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/imagePortrait"
android:layout_width="78dp"
android:layout_height="63dp"
android:layout_marginLeft="25dp"
android:textAlignment="center"
android:contentDescription="TODO"
android:layout_marginStart="25dp" />
<TextView
android:id="#+id/textNamePortrait"
android:layout_width="225dp"
android:layout_height="30dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:text="TextView"
android:layout_marginStart="10dp" />
</LinearLayout>
portraitcontenetorlayout:
<?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="vertical">
<TextView
android:id="#+id/textViewPieces"
android:layout_width="match_parent"
android:layout_height="35dp"
android:background="#BCBCBC"
android:paddingLeft="7dp"
android:text=" TextView"
android:gravity="center_vertical" />
<android.support.v7.widget.RecyclerView
android:id="#+id/RecyclerViewPieces"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
activitypieces:
<?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="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textView3"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="30dp"
android:text="Obras" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerViewListPieces"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Related
I am a novice Java/Android studio student, just blindly following examples on the internet.
I wanted to make a CardView inside a fragment, but most of the examples out there were putting cardview inside an activity, so I searched and changed the appropriate codes. After some time tinkering, I managed to make it build without errors.
However, cardview is not showing up in RecyclerView.
I suspect it is a layout issue, but after all the changes with layout_height and layout_width, I can't get cardview to be seen.
Any help will be appreciated.
My code:
HomeFragment.java
public class HomeFragment extends Fragment implements View.OnClickListener {
final int ITEM_SIZE = 5;
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_home, container, false);
Button bh = v.findViewById(R.id.bh);
bh.setOnClickListener(this);
RecyclerView rv = (RecyclerView) v.findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
rv.setHasFixedSize(true);
rv.setLayoutManager(layoutManager);
List<Item> items = new ArrayList<>();
Item[] item = new Item[ITEM_SIZE];
item[0] = new Item(R.drawable.a, "#1");
item[1] = new Item(R.drawable.b, "#2");
item[2] = new Item(R.drawable.c, "#3");
item[3] = new Item(R.drawable.d, "#4");
item[4] = new Item(R.drawable.e, "#5");
RecyclerAdapter adaptor = new RecyclerAdapter(getActivity(), items, R.layout.fragment_home);
rv.setAdapter(adaptor);
return v;
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bh:
((BottomNavigationView)getActivity().findViewById(R.id.nav_view)).setSelectedItemId(R.id.navigation_settings);
break;
}
}
}
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
Context context;
List<Item> items;
int item_layout;
public RecyclerAdapter(Context context, List<Item> items, int item_layout) {
this.context = context;
this.items = items;
this.item_layout = item_layout;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_home, null);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final Item item = items.get(position);
Drawable drawable = ContextCompat.getDrawable(context, item.getImage());
holder.image.setBackground(drawable);
holder.title2.setText(item.getTitle());
holder.cardview.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, item.getTitle(), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return this.items.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView image;
TextView title2;
CardView cardview;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
title2 = (TextView) itemView.findViewById(R.id.title2);
cardview = (CardView) itemView.findViewById(R.id.cardview);
}
}
}
Item.java
public class Item {
int image;
String title;
int getImage() { return this.image; }
String getTitle() { return this.title; }
public Item(int image, String title) {
this.image = image;
this.title = title;
}
}
fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/MainLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/text_home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/title_home"
android:textSize="40sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.952"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="#+id/bh"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/text_home" />
<Button
android:id="#+id/bh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="50dp"
android:text="#string/title_settings"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
card.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.card.MaterialCardView
android:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="200dp"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="20dp"
app:cardElevation="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="150dp"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/title2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:text="TextView"
android:textSize="25sp" />
</LinearLayout>
</com.google.android.material.card.MaterialCardView>
Seems you are inflating the wrong layout in RecyclerAdapter.java
try this
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
Context context;
List<Item> items;
int item_layout;
public RecyclerAdapter(Context context, List<Item> items, int item_layout) {
this.context = context;
this.items = items;
this.item_layout = item_layout;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card, null);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final Item item = items.get(position);
Drawable drawable = ContextCompat.getDrawable(context, item.getImage());
holder.image.setBackground(drawable);
holder.title2.setText(item.getTitle());
holder.cardview.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, item.getTitle(), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return this.items.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView image;
TextView title2;
CardView cardview;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
title2 = (TextView) itemView.findViewById(R.id.title2);
cardview = (CardView) itemView.findViewById(R.id.cardview);
}
}
I am a new Programmer, actually I was trying to make an app. I was trying to make an activity that uses RecyclerView to Show TextInputEditText with spinner and TextView. It means that I was trying to make an activity that uses Recyclerview and In the layout of Recycler View, I have used Text Input Edit Text and Spinner and TextView. I have put these three in a single layout. But the main problem that I facing is that when I launch my app with my code then it remains blank activity it is not showing TextInputEditText nor spinner and nor TextView.
So the conclusion is I want to show [TextInputEditText, Spinner and TextView] in RecyclerView But my code is returning Blank Activity.
Here is my code:-
It is my adapter class:-
public class SpecialHoursAdapter extends RecyclerView.Adapter<SpecialHoursAdapter.SpecialHourHolder> {
// private ArrayList[] mDataSet;
private List<SpecialHorusModal> modal = new ArrayList<>();
private Context context;
public SpecialHoursAdapter(Context context) {
this.context = context;
}
#NonNull
#Override
public SpecialHourHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.special_hours_layout_card, parent, false);
return new SpecialHourHolder(view);
}
#Override
public void onBindViewHolder(#NonNull SpecialHourHolder holder, int position) {
}
#Override
public int getItemCount() {
return modal.size();
}
public static class SpecialHourHolder extends RecyclerView.ViewHolder {
private TextInputEditText editText;
private Spinner spinner;
private TextView textView;
public SpecialHourHolder(#NonNull View itemView) {
super(itemView);
editText = itemView.findViewById(R.id.special_hours_editor);
spinner = itemView.findViewById(R.id.spinner_special_hours_date);
textView = itemView.findViewById(R.id.time_picker_special_horus);
}
}
}
It is My MainActivity:-
public class SpecialHoursActivity extends AppCompatActivity {
private RecyclerView containerRecyclerView;
private RecyclerView.LayoutManager first, container;
private SpecialHoursAdapter adapter;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_special_horus);
// mainRecyclerView = findViewById(R.id.activity_special_horus_main_recyclerview);
containerRecyclerView = findViewById(R.id.layout_container_recyclerview_special_hours);
// mainRecyclerView.setHasFixedSize(true);
containerRecyclerView.setHasFixedSize(true);
first = new LinearLayoutManager(this);
container = new LinearLayoutManager(this);
// mainRecyclerView.setLayoutManager(first);
containerRecyclerView.setLayoutManager(container);
containerRecyclerView.setAdapter(adapter);
}
}
Here is my RecyclerView Layout:-
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/special_hours_editor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter Special Hours"
android:inputType="text"
android:maxLength="20" />
</com.google.android.material.textfield.TextInputLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Spinner
android:id="#+id/spinner_special_hours_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/time_picker_special_horus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:gravity="end"
android:text="00:00" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
My Main Layout -
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_special_horus_main_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:scrollbars="vertical">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="#+id/layout_container_recyclerview_special_hours"
android:orientation="vertical"
android:scrollbars="vertical">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
I have not used any modal class because I don't know how to use it with Widgets.
you need to pass the data to your adapter
public SpecialHoursAdapter(Context context,List<SpecialHorusModal> data) {
this.context = context;
this.model=data; //it will show your recyclerview
}
we could not show the Recyclerview with empty data
You need to populate the data your Adapter holds, adapter with empty data will obviously show no items.
public class SpecialHoursAdapter extends RecyclerView.Adapter<SpecialHoursAdapter.SpecialHourHolder> {
private List<SpecialHorusModal> items = new ArrayList<>();
private Context context;
public SpecialHoursAdapter(Context context) {
this.context = context;
}
//Call this in onClick of your button, passing it the object to add
public void addItem(SpecialHoursModal item) {
items.add(item);
notifyDataSetChange(); //This is important
}
#NonNull
#Override
public SpecialHourHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.special_hours_layout_card, parent, false);
return new SpecialHourHolder(view);
}
#Override
public void onBindViewHolder(#NonNull SpecialHourHolder holder, int position) {
//Bind the data to view for the object at this position
SpecialHorusModal item = items.get(position);
//...
}
#Override
public int getItemCount() {
return items.size();
}
public static class SpecialHourHolder extends RecyclerView.ViewHolder {
private TextInputEditText editText;
private Spinner spinner;
private TextView textView;
public SpecialHourHolder(#NonNull View itemView) {
super(itemView);
editText = itemView.findViewById(R.id.special_hours_editor);
spinner = itemView.findViewById(R.id.spinner_special_hours_date);
textView = itemView.findViewById(R.id.time_picker_special_horus);
}
}
}
When your button is clicked, or you need to add an item:
adapter.addItem(new SpecialHorusModal(...));
So, for a personal project I'm making a stream app for Android which are separated by three fragments in the main screen where each of those fragment will be a list of a type of show in our archive, like movies, TV series and animations by using a RecyclerView inside of them.
That being said, after some errors that I managed to fix, the app is not showing what was expected, by skipping the RecyclerView because it has no "adapter".
Here is the code so far:
The main activity:
public class MenuPrincipal extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu_principal);
AbasMenuPrincipalAdapter adapter = new AbasMenuPrincipalAdapter( getSupportFragmentManager() );
adapter.adicionar( new FilmesFragment() , "Filmes");
adapter.adicionar( new SeriesFragment() , "Series");
adapter.adicionar( new AnimacoesFragment() , "Animações");
ViewPager viewPager = (ViewPager) findViewById(R.id.abas_view_pager);
viewPager.setAdapter(adapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.abas);
tabLayout.setupWithViewPager(viewPager);
}
}
One of the fragments used on the main screen:
public class AnimacoesFragment extends Fragment {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
ArrayList<Item> exemploItemList = new ArrayList<Item>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.animacoes_fragment, container, false);
TextView tv = view.findViewById(R.id.text1);
tv.setText("Você está na terceira aba");
exemploItemList.add(new Item(R.drawable.ic_android, "Line1", "line2"));
exemploItemList.add(new Item(R.drawable.ic_desktop_mac, "Line2", "line3"));
exemploItemList.add(new Item(R.drawable.ic_laptop_windows, "Line4", "line5"));
mRecyclerView = (RecyclerView) view.findViewById(R.id.AnimacaoRecyclerView);
mRecyclerView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(llm);
ItemAdapter adapter = new ItemAdapter(exemploItemList);
mAdapter = adapter;
mRecyclerView.setAdapter(mAdapter);
return view;
}
}
And its layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="#+id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/AnimacaoRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="4dp"
android:scrollbars="vertical" />
</LinearLayout>
This is what I'm trying to show on that RecyclerView (later will be the real thing, now it's just a test):
public class Item {
private int mImageResource;
private String text1;
private String text2;
public Item(int mImageResource, String text1, String text2) {
this.mImageResource = mImageResource;
this.text1 = text1;
this.text2 = text2;
}
public int getmImageResource() {
return mImageResource;
}
public void setmImageResource(int mImageResource) {
this.mImageResource = mImageResource;
}
public String getText1() {
return text1;
}
public void setText1(String text1) {
this.text1 = text1;
}
public String getText2() {
return text2;
}
public void setText2(String text2) {
this.text2 = text2;
}
}
It's layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp">
<ImageView
android:id="#+id/imageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:contentDescription="#string/imagem"
android:padding="2dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="50dp"
android:layout_marginTop="0dp"
android:text="#string/line1"
android:textColor="#000000"
android:textSize="20sp"
android:textStyle="bold"
android:id="#+id/textView"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="50dp"
android:layout_marginTop="28dp"
android:text="#string/line2"
android:textSize="15sp"
android:textStyle="bold"
android:id="#+id/textView2"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
Finally, the adapter used to convert the list:
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {
private ArrayList<Item> mItemList;
public static class ItemViewHolder extends RecyclerView.ViewHolder{
public ImageView mImageView;
public TextView mTextView1;
public TextView mTextView2;
public ItemViewHolder(#NonNull View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.imageView);
mTextView1 = itemView.findViewById(R.id.textView);
mTextView2 = itemView.findViewById(R.id.textView2);
}
}
#NonNull
#Override
public ItemViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
ItemViewHolder ivh = new ItemViewHolder(v);
return ivh;
}
public ItemAdapter(ArrayList<Item> itemList){
mItemList = itemList;
}
#Override
public void onBindViewHolder(#NonNull ItemViewHolder holder, int position) {
Item currentItem = mItemList.get(position);
holder.mImageView.setImageResource(currentItem.getmImageResource());
holder.mTextView1.setText(currentItem.getText1());
holder.mTextView2.setText(currentItem.getText2());
}
#Override
public int getItemCount() {
return mItemList.size();
}
}
First of all, check your fragment layout file. The linear layout parent orientation set to 'horizontal' and width of it's child views ('textview' & 'recyclerview') is match parent. This won't work.
Try to initialize your recyclerview adapter in 'onCreate' and use 'notifyDataSetChanged()' after setting up the adapter with recyclerview.
I am following the Android Developer's explanatin on how to set RecyclerView, but I get some errors, for example android.widget.LinearLayout cannot be cast to android.widget.TextView.
The code taken from here : RecyclerView
This is my code, including all necessary files:
MainActivity.java:
package com.example.lastlocation.recyclerviewer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
String[] myDataset = new String[5];
myDataset[0] = "Data0";
myDataset[1] = "Data1";
myDataset[2] = "Data2";
myDataset[3] = "Data3";
myDataset[4] = "Data4";
// specify an adapter (see also next example)
mAdapter = new MyAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
}
}
This is MyAdapter.java:
package com.example.lastlocation.recyclerviewer;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private String[] mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public MyViewHolder(TextView v) {
super(v);
mTextView = v;
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
TextView v = (TextView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.mTextView.setText(mDataset[position]);
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.length;
}
}
this is activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<View
android:id="#+id/view"
android:layout_width="386dp"
android:layout_height="135dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/imageView"
android:layout_width="66dp"
android:layout_height="64dp"
android:layout_marginTop="24dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/view"
app:srcCompat="#android:color/holo_orange_dark" />
<TextView
android:id="#+id/textView2"
android:layout_width="68dp"
android:layout_height="30dp"
android:layout_marginTop="8dp"
android:text="John Doe"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView" />
<!-- A RecyclerView with some commonly used attributes -->
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="375dp"
android:layout_height="367dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="4dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.428"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/view"
app:layout_constraintVertical_bias="1.0" />
</android.support.constraint.ConstraintLayout>
And this is the xml for a single text view called my_text_view.xml:
<?xml version="1.0" encoding="utf-8"?>
<!-- Layout for a single list item -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp">
<TextView
android:id="#+id/my_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
As you can see I nearly copied the code from the Android Developer's website, but I still don't know where is the problem.
public static class MyViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public MyViewHolder(TextView v) {
super(v);
mTextView = v;
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
The problem is in your ViewHolder constructor it should be like that
public static class MyViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public MyViewHolder(View v) {
super(v);
mTextView = v.findViewById(R.id.your_text_view_id);
}
}
#Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = (TextView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
You are trying to assign LinearLayout which is the View in your constructor to your TextView and it is crashing. This will fix the problem.
The view you receive as a constructor param in your ViewHolder is the root view of your ViewHolder, in your case a LinearLayout, from this root view you can find the other views in it.
You are inflating row view wrongly and thus not assigning views in viewholder in proper manner change your code as below
#Override
public UserListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
ViewHolder vh = new ViewHolder((inflater.inflate(R.layout.your_row_layout, parent, false)));
return vh;
}
and change your viewholder as below
public static class MyViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public MyViewHolder(View v) {
super(v);
mTextView = v.findViewById(R.id.my_text_view);
}
}
Just Simply you need to change your onCreateViewHolder method by taking as
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
return view;
Creating a tabbed fragment activity, in my home_fragment i am trying to display a horizontal and a vertical list view, but its not displaying the list, below is my code of home_fragment for onCreateView() method --
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v=inflater.inflate(R.layout.fragment_home, container, false);
horizontalList = (RecyclerView)v.findViewById(R.id.horizontal_recycler);
verticalList = (RecyclerView)v.findViewById(R.id.recyle_view);
horizontalList.setHasFixedSize(true);
verticalList.setHasFixedSize(true);
//set horizontal LinearLayout as layout manager to creating horizontal list view
LinearLayoutManager horizontalManager = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);
horizontalList.setLayoutManager(horizontalManager);
horizontalAdapter = new HorizontalListAdapter(getActivity());
horizontalList.setAdapter(horizontalAdapter);
//set vertical LinearLayout as layout manager for vertial listview
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
verticalList.setLayoutManager(layoutManager);
verticalAdapter = new VerticalListAdapter(getActivity());
verticalList.setAdapter(verticalAdapter);
return v;
}
Is there any changes to be made here.
HorizontalListAdapter.java --
public class HorizontalListAdapter extends RecyclerView.Adapter<HorizontalListAdapter.ViewHolder>{
private Activity activity;
public HorizontalListAdapter(Activity activity) {
this.activity = activity;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
LayoutInflater inflater = activity.getLayoutInflater();
View view = inflater.inflate(R.layout.item_horizontal_list, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(HorizontalListAdapter.ViewHolder viewHolder, final int position) {
viewHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(activity, "Position clicked: " + position, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return 10;
}
/**
* View holder to display each RecylerView item
*/
protected class ViewHolder extends RecyclerView.ViewHolder {
private LinearLayout linearLayout;
public ViewHolder(View view) {
super(view);
linearLayout = (LinearLayout) view.findViewById(R.id.layout);
}
}
}
item_horizontal_list.xml--
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="210dp"
android:layout_height="wrap_content"
android:layout_marginRight="5dp">
<LinearLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/mountain" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="#string/lorem_ipsum" />
</LinearLayout>
</android.support.v7.widget.CardView>
Not displaying horizontal and vertical list in fragment
in your onBindViewHolder you are no displaying any data check out your adapter class
You need to set any data inside your onBindViewHolder like this
Sample code
public class HorizontalListAdapter extends RecyclerView.Adapter<HorizontalListAdapter.ViewHolder> {
private Activity activity;
public HorizontalListAdapter(Activity activity) {
this.activity = activity;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
LayoutInflater inflater = activity.getLayoutInflater();
View view = inflater.inflate(R.layout.item_horizontal_list, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(HorizontalListAdapter.ViewHolder viewHolder, final int position) {
viewHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(activity, "Position clicked: " + position, Toast.LENGTH_SHORT).show();
}
});
viewHolder.edtName.setText("NILU");
viewHolder.imageView.setImageResource(R.mipmap.ic_launcher);
}
#Override
public int getItemCount() {
return 10;
}
/**
* View holder to display each RecylerView item
*/
protected class ViewHolder extends RecyclerView.ViewHolder {
private LinearLayout linearLayout;
TextView edtName, edtPhone, edtPass, edtAdrress;
ImageView imageView;
public ViewHolder(View view) {
super(view);
linearLayout = (LinearLayout) view.findViewById(R.id.layout);
edtName = view.findViewById(R.id.edtUname);
imageView = view.findViewById(R.id.imageView);
}
}
}
Changes in your layout you need to set id to your imageview and textview
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="210dp"
android:layout_height="wrap_content"
android:layout_marginRight="5dp">
<LinearLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/mountain" />
<TextView
android:id="#+id/edtUname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="#string/lorem_ipsum" />
</LinearLayout>
</android.support.v7.widget.CardView>
here is the good tutorial of Android working with Card View and Recycler View