У меня есть 3 RecyclerViews в LinearLayout.Моя цель - показать их все последовательно, поэтому 1-й RecylerView находится сверху, 2-й RecyclerView находится посередине, а 3-й RecyclerView находится снизу.Но 3-й RecyclerView не появляется на экране.В следующем вы можете увидеть мои файлы:
// GroupsScreenActivity.java
public class GroupsScreenActivity extends AppCompatActivity {
private RecyclerView recyclerViewGoldenGroup;
private RecyclerView recyclerViewSilverGroup;
private RecyclerView recyclerViewBronceGroup;
private GoldenRecyclerViewAdapter goldenGroupRecyclerViewAdapter;
private SilverGroupRecyclerViewAdapter silverGroupRecyclerViewAdapter;
private BronceRecyclerViewAdapter bronceGroupRecyclerViewAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_groups_screen);
// get a reference to the golden recyclerView
recyclerViewGoldenGroup = (RecyclerView) findViewById(R.id.rvGoldenGroup);
// create the adapter
goldenGroupRecyclerViewAdapter = new GoldenRecyclerViewAdapter(getSampleArrayList());
// create the LinearLayoutManager
LinearLayoutManager goldenLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
// set the LayoutManager
recyclerViewGoldenGroup.setLayoutManager(goldenLayoutManager);
// set the adapter
recyclerViewGoldenGroup.setAdapter(goldenGroupRecyclerViewAdapter);
///////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////
// get a reference to the silver RecyclerView
recyclerViewSilverGroup = (RecyclerView) findViewById(R.id.rvSilverGroup);
// create the adapter
silverGroupRecyclerViewAdapter = new SilverGroupRecyclerViewAdapter(getSampleArrayList());
// create the LinearLayoutManager
LinearLayoutManager silverLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
// set the LayoutManager
recyclerViewSilverGroup.setLayoutManager(silverLayoutManager);
// set the adapter
recyclerViewSilverGroup.setAdapter(silverGroupRecyclerViewAdapter);
////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
// get the reference to the bronce RecyclerView
recyclerViewBronceGroup = (RecyclerView) findViewById(R.id.rvBronceGroup);
// create the adapter
bronceGroupRecyclerViewAdapter = new BronceRecyclerViewAdapter(getSampleArrayList());
// create the LayoutManager
LinearLayoutManager bronceLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
// set the LayoutManager
recyclerViewBronceGroup.setLayoutManager(bronceLayoutManager);
// set the adapter
recyclerViewSilverGroup.setAdapter(bronceGroupRecyclerViewAdapter);
}
private ArrayList<Object> getSampleArrayList() {
ArrayList<Object> items = new ArrayList<>();
items.add(new User("Dany Targaryen", "Valyria"));
items.add(new User("Rob Stark", "Winterfell"));
items.add("image");
items.add(new User("Jon Snow", "Castle Black"));
items.add("image");
items.add(new User("Tyrion Lanister", "King's Landing"));
return items;
}
}
В следующем вы можете увидеть файл макета.Он состоит из ConstraintLayout с вертикальным LinearLayout, который имеет 3 дочерних элемента RecyclerViews:
<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=".GroupsScreen">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/rvGoldenGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.v7.widget.RecyclerView
android:id="@+id/rvSilverGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.v7.widget.RecyclerView
android:id="@+id/rvBronceGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
Для краткости я добавляю только подкласс RecyclerView.Adapter верхнего RecyclerView.Два других просто одинаковы:
public class GoldenRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
// The items to display in your RecyclerView
private List<Object> items;
private final int USER = 0, IMAGE = 1;
// Provide a suitable constructor (depends on the kind of dataset)
public GoldenRecyclerViewAdapter(List<Object> items) {
this.items = items;
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return this.items.size();
}
// we need to override this method to tell the
// "RecyclerView" about the type of view to inflate
// based on the position
// we'll return USER or IMAGE based on the type object
// in the data we have
@Override
public int getItemViewType(int position) {
if(items.get(position) instanceof User){
return USER;
}
else if(items.get(position) instanceof String){
return IMAGE;
}
return -1;
}
// we need to override this method
// to tell the "RecyclerView.Adapter" about which "RecyclerView.ViewHolder"
// object to create based on the "viewType" returned
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
RecyclerView.ViewHolder viewHolder;
LayoutInflater inflater = LayoutInflater
.from(viewGroup.getContext());
switch (viewType){
case USER:
View v1 = inflater.inflate(
R.layout.layout_viewholder1,
viewGroup,
false);
viewHolder = new ViewHolder1(v1);
break;
case IMAGE:
View v2 = inflater.inflate(
R.layout.layout_viewholder2,
viewGroup,
false);
viewHolder = new ViewHolder2(v2);
break;
default:
View view = inflater.inflate(
android.R.layout.simple_list_item_1,
viewGroup,
false);
viewHolder = new RecyclerViewSimpleTextViewHolder(view);
break;
}
return viewHolder;
}
// we override this method
// to configure the "ViewHolder" with actual data that needs to be
// displayed
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
switch (viewHolder.getItemViewType()) {
case USER:
ViewHolder1 vh1 = (ViewHolder1) viewHolder;
configureViewHolder1(vh1, position);
break;
case IMAGE:
ViewHolder2 vh2 = (ViewHolder2) viewHolder;
configureViewHolder2(vh2);
break;
default:
RecyclerViewSimpleTextViewHolder vh = (RecyclerViewSimpleTextViewHolder) viewHolder;
configureDefaultViewHolder(vh, position);
break;
}
}
private void configureDefaultViewHolder(RecyclerViewSimpleTextViewHolder vh, int position) {
vh.getTv().setText((CharSequence) items.get(position));
}
private void configureViewHolder1(ViewHolder1 vh1, int position) {
User user = (User) items.get(position);
if (user != null) {
vh1.getLabel1().setText("Name: " + user.getName());
vh1.getLabel2().setText("Hometown: " + user.getHomeTown());
}
}
private void configureViewHolder2(ViewHolder2 vh2) {
vh2.getIvExample().setImageResource(R.drawable.ic_launcher_background);
}
}
Я надеюсь, что кто-нибудь может помочь.Вот как это выглядит.Как видите, только 1-й и 2-й RecylerView отображаются на экране.