リサイクラビューを下に置いたときのコンテンツが表示されないAppBarLayout

Question

私は、このレイアウト（これは私がガイドから外したもの）とその完璧なものをアプリに作っています。しかし、私はそれにデータを表示することができませんでした - あなたがレイアウトファイルに置かれたリサイクラビューで見ることができるように。

はここでここで走るの活動だレイアウト

<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:id="@+id/drawer" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true"> 

<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

<android.support.design.widget.AppBarLayout 
     android:id="@+id/appbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

<android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="?attr/colorPrimary" 
      app:layout_scrollFlags="scroll|enterAlways" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /> 

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

<android.support.v7.widget.RecyclerView 
     android:id="@+id/recycler_view" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:scrollbars="vertical" /> 

<android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 


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

<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    android:fitsSystemWindows="true" 
    app:headerLayout="@layout/navheader" 
    app:menu="@menu/menu_navigation" /> 

だすべてのもの：

import android.support.design.widget.NavigationView; 
    import android.support.v4.widget.DrawerLayout; 
    import android.support.v7.app.ActionBar; 
    import android.support.v7.app.AppCompatActivity; 
    import android.os.Bundle; 
    import android.support.v7.widget.DefaultItemAnimator; 
    import android.support.v7.widget.LinearLayoutManager; 
    import android.support.v7.widget.RecyclerView; 
    import android.support.v7.widget.Toolbar; 
    import android.view.MenuItem; 
    import java.util.ArrayList; 
    import java.util.List; 

    public class basics_list extends AppCompatActivity { 
     private DrawerLayout mDrawerLayout; 
     private List<Basic> basicList = new ArrayList<>(); 
     private RecyclerView recyclerView; 
     private BasicsAdapter mAdapter; 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setTitle(R.string.basics_list_name); 
      setContentView(R.layout.activity_basics_list); 

      // Adding Toolbar to Main screen 

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


      // set recycler view 

      recyclerView = (RecyclerView) findViewById(R.id.recycler_view); 

      mAdapter = new BasicsAdapter(basicList); 
      final RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
      recyclerView.setLayoutManager(mLayoutManager); 
      recyclerView.setItemAnimator(new DefaultItemAnimator()); 
      recyclerView.setAdapter(mAdapter); 

      prepareBasicsData(); 

      // Create Navigation drawer and inflate layout 
      NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
      mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer); 

    // Adding menu icon to Toolbar 
      ActionBar supportActionBar = getSupportActionBar(); 
      if (supportActionBar != null) { 
       supportActionBar.setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp); 
       supportActionBar.setDisplayHomeAsUpEnabled(true); 
      } 

    // Set behavior of Navigation drawer 
      navigationView.setNavigationItemSelectedListener(
        new NavigationView.OnNavigationItemSelectedListener() { 
         // This method will trigger on item Click of navigation menu 
         @Override 
         public boolean onNavigationItemSelected(MenuItem menuItem) { 
          // Set item in checked state 
          menuItem.setChecked(true); 
          // TODO: handle navigation 
          // Closing drawer on item click 
          mDrawerLayout.closeDrawers(); 
          return true; 
         } 
        }); 


     } 

     private void prepareBasicsData() { 
      Basic basic = new Basic("one"); 
      basicList.add(basic); 

      basic = new Basic("two"); 
      basicList.add(basic); 

      basic = new Basic("three"); 
      basicList.add(basic); 

      mAdapter.notifyDataSetChanged(); 
     } 
    } 

Answer 1

を増やしてみてくださいあなたのRecyclerViewにlayout_behavior

<android.support.v7.widget.RecyclerView 
     android:id="@+id/recycler_view" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" 
     android:scrollbars="vertical" /> 

CoordinatorLayoutsのthis質問を参照