Recycler View scrollt nicht in der Navigationsleiste

Question

Ich habe eine Navigationsleiste erstellt und im Hauptinhalt der Navigationsleiste habe ich einen RecyclerView, aber es scrollt nicht. Anfangs habe ich RecyclerView ohne NestedScrollView gesetzt, aber das hat nicht funktioniert, also habe ich versucht, es in NestedScrollView zu setzen, aber letzteres hat auch nicht funktioniert.

Meine Navigationsleiste XML ist:

<RelativeLayout 
    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="com.roushan.assignment1.NavDrawerActivity"> 

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

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

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

    <!-- MAIN CONTENT OF NAVIGATION DRAWER ACTIVITY --> 
    <android.support.v4.widget.NestedScrollView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:fillViewport="true" 
      app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

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

    </android.support.v4.widget.NestedScrollView> 

    <android.support.v4.widget.DrawerLayout 
     android:id="@+id/drawer_layout" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_marginTop="56dp" 
     tools:openDrawer="start"> 

     <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/nav_drawer_header" 
      app:menu="@menu/activity_nav_drawer_drawer" > 


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

    </android.support.v4.widget.DrawerLayout> 

</RelativeLayout> 

Answer 1

Als Mike wies darauf hin, wie Sie das Layout strukturiert haben falsch ist. Bitte ändern Sie das Layout wie folgt:

<RelativeLayout 
    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="com.roushan.assignment1.NavDrawerActivity"> 

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

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

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

    <android.support.v4.widget.DrawerLayout 
     android:id="@+id/drawer_layout" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_marginTop="56dp" 
     tools:openDrawer="start"> 

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

     <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/nav_drawer_header" 
      app:menu="@menu/activity_nav_drawer_drawer" > 
     </android.support.design.widget.NavigationView> 

    </android.support.v4.widget.DrawerLayout> 

</RelativeLayout>