RecycleView zeigt nur den ersten Artikel an

Question

Hier ist das Problem: Ich erstelle den einfachsten RecyclerView der Welt, aber er zeigt nur den ersten Eintrag an. Ich kann nicht verstehen warum. Danke für jede Hilfe.

item_layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/tv_detail"/> 
</RelativeLayout> 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    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:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.bcit.moonlady.testrecycler.MainActivity"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Hello World!" 
     android:id="@+id/tv_hello"/> 

    <android.support.v7.widget.RecyclerView 
     android:layout_width="match_parent" 
     android:layout_height="300dp" 
     android:id="@+id/rv_details" 
     android:layout_below="@+id/tv_hello"/> 
</RelativeLayout> 

MainActivity.java

package com.bcit.moonlady.testrecycler; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 
    String[] data = {"test1", "test2", "test3"}; 

    RecyclerView mRecView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     mRecView = (RecyclerView)findViewById(R.id.rv_details); 
     mRecView.setHasFixedSize(true); 
     mRecView.setLayoutManager(new LinearLayoutManager(getApplicationContext())); 
     mRecView.setAdapter(new DetailAdapter()); 
    } 

    private class DetailView extends RecyclerView.ViewHolder { 
     TextView mTextView; 

     public DetailView(View itemView) { 
      super(itemView); 
      mTextView = (TextView)itemView.findViewById(R.id.tv_detail); 
     } 

     public void bindView(String string) { 
      mTextView.setText(string); 
     } 
    } 

    private class DetailAdapter extends RecyclerView.Adapter<DetailView> { 
     @Override 
     public DetailView onCreateViewHolder(ViewGroup parent, int viewType)   { 
      LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext()); 
      View v = layoutInflater.inflate(R.layout.item_layout, parent, false); 
      return new DetailView(v); 
     } 

     @Override 
     public void onBindViewHolder(DetailView holder, int position) { 
      String string = data[position]; 
      holder.bindView(string); 
     } 

     @Override 
     public int getItemCount() { 
      return data.length; 
     } 
    } 
} 

Answer 1

Erste sollten Sie Ihre Recyclerview.veiwholder-Klasse in den Adapter einfügen, um sicherzustellen, dass Sie dieselbe Instanz erhalten.

//replaces contents of a view, invoked by the layout manager 
@Override public void onBindViewHolder(ViewHolder holder, int position) { 
// get the message to display from the array at the specified position 
// replace contents of the view with the new element 
holder.mytextview.setText(recieveHistory.get(position)); 
} 

Answer 2

Sie benötigen item_layout Höhe als wrap_content zu ändern, wenn Ihr v Android Support Library verwenden 23.2.0

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/tv_detail"/> 
</RelativeLayout> 

Answer 3

Aktivität:

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.support.v7.widget.Toolbar; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.ViewGroup; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 
private RecyclerView mRecycler; 
String[] data = {"test1", "test2", "test3"}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    mRecycler = (RecyclerView) findViewById(R.id.rv_details); 
    DetailAdapter adapter = new DetailAdapter(); 
    LinearLayoutManager manager = new LinearLayoutManager(this); 
    mRecycler.setHasFixedSize(true); 
    mRecycler.setLayoutManager(manager); 
    mRecycler.setAdapter(adapter); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

private class DetailAdapter extends RecyclerView.Adapter<DetailAdapter.DetailView> { 

    @Override 
    public void onBindViewHolder(DetailView holder, int position) { 
     String string = data[position]; 
     holder.bindView(string); 
    } 

    @Override 
    public DetailView onCreateViewHolder(ViewGroup parent, int viewType) { 
     LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext()); 
     View v = layoutInflater.inflate(R.layout.item_layout, parent, false); 
     return new DetailView(v); 
    } 

    @Override 
    public int getItemCount() { 
     return data.length; 
    } 

    class DetailView extends RecyclerView.ViewHolder { 
     TextView mTextView; 

     public DetailView(View itemView) { 
      super(itemView); 
      mTextView = (TextView)itemView.findViewById(R.id.tv_detail); 
     } 

    public void bindView(String string) { 
     mTextView.setText(string); 
    } 
} 

    } 
} 

activity_main .xml

<?xml version="1.0" encoding="utf-8"?> 
 
<android.support.design.widget.CoordinatorLayout 
 
    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" android:fitsSystemWindows="true" 
 
    tools:context=".MainActivity"> 
 

 
    <android.support.design.widget.AppBarLayout android:layout_height="wrap_content" 
 
     android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay"> 
 

 
     <android.support.v7.widget.Toolbar android:id="@+id/toolbar" 
 
      android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" 
 
      android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> 
 

 
    </android.support.design.widget.AppBarLayout> 
 

 
    <include layout="@layout/content_main" /> 
 

 
    <android.support.design.widget.FloatingActionButton android:id="@+id/fab" 
 
     android:layout_width="wrap_content" android:layout_height="wrap_content" 
 
     android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" 
 
     android:src="@android:drawable/ic_dialog_email" /> 
 

 
</android.support.design.widget.CoordinatorLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?> 
 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
    xmlns:tools="http://schemas.android.com/tools" 
 
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" 
 
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" 
 
    android:paddingRight="@dimen/activity_horizontal_margin" 
 
    android:paddingTop="@dimen/activity_vertical_margin" 
 
    android:paddingBottom="@dimen/activity_vertical_margin" 
 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
 
    tools:showIn="@layout/activity_main" tools:context=".MainActivity"> 
 

 

 

 
    <android.support.v7.widget.RecyclerView 
 
     android:layout_width="match_parent" 
 
     android:layout_height="match_parent" 
 
     android:id="@+id/rv_details" 
 
     /> 
 

 

 
</RelativeLayout>

item_layout.xml

<?xml version="1.0" encoding="utf-8"?> 
 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
    android:layout_width="match_parent" 
 
    android:layout_height="match_parent"> 
 

 
    <TextView 
 
     android:layout_width="match_parent" 
 
     android:layout_height="match_parent" 
 
     android:id="@+id/tv_detail"/> 
 

 
</RelativeLayout>

Answer 4

kann es helfen,

customAdapter = new CustomRecycleradapter(arrItems); 
recyclerView.setLayoutManager(new LinearLayoutManager(mParentActivity)); 
recyclerView.setAdapter(customAdapter); 

ArrayList<ListofItems> mSource; 
// adapter class 
public CustomRecycleradapter(ArrayList<ListofItems> source) { 
    this.mSource = source; 

} 
@Override 
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.item, parent, false); 
    return new CustomHolder(view); 
} 
@Override 
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { 
    if (holder instanceof CustomHolder) { 
     ((CustomHolder) holder).customerName.setText(mSource.get(position).getCustomerNumber()); 

    } 
} 

@Override 
public int getItemCount() { 
    return mSource.size(); 
} 

public void addItem(ArrayList<ListofItems> itemLists) { 
    mSource.addAll(itemLists); 

    notifyItemInserted(mSource.size() - 1); 
} 
public class CustomHolder extends RecyclerView.ViewHolder { 
    @Bind(R.id.customer_name) 
    TextView customerName; 
    @Bind(R.id.time_stamp) 
    TextView timeStamp; 
    @Bind(R.id.amount) 
    TextView amount; 

    public CustomHolder(View itemView) { 
     super(itemView); 
     ButterKnife.bind(this, itemView); 

    } 
} 

Answer 5

ich zu dieser gemeinsamen Fehler gemacht. Ändern Sie einfach Ihre Eltern Linearlayout - Höhe sein „wrap_content“ sollte

<LinearLayout 
android:layout_width="match_parent" 
android:layout_height = "wrap_content" 
..... > 
.. 
.. 
</LinearLayout> 

Answer 6

die Höhe wrap_content des RelativeLayout im item_layout.xml Set.

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/tv_detail"/> 
</RelativeLayout>