Verhindern, dass FAB beim Scrollen in RecyclerView im Fragment heruntergeht

Question

Ich bin neu in der Android-Entwicklung und lerne kürzlich über Fragmente.

ich ein recyclerview innerhalb Fragment haben, und ich möchte es in die Symbolleiste angebracht werden, habe ich versucht, setzen app:layout_behavior="@string/appbar_scrolling_view_behavior" im Inneren des Behälters Layout aber wenn die Symbolleiste die FAB bewegt sich nach unten unterhalb der Navigationsleiste zeigt, wie Sie here sehen können.

activity_main.XML

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout 
    android:id="@+id/main_screen" 
    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.atar.mango.MainActivity"> 

    <android.support.design.widget.CoordinatorLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <android.support.design.widget.AppBarLayout 
      android:id="@+id/app_bar" 
      android:orientation="vertical" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 

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

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

     <FrameLayout 
      android:id="@+id/container" 
      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="match_parent" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     app:headerLayout="@layout/logo_header" 
     app:menu="@menu/menu_for_navigation_view"/> 

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

home_fragment.XML

<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" 
    tools:context="com.atar.mango.HomeFragment" 
    android:background="@color/background"> 

    <TextView 
     android:id="@+id/empty" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:text="@string/empty" 
     android:gravity="center" 
     android:textSize="90sp" 
     android:textColor="#32000000"/> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/notes" 
     app:backgroundTint="@color/background" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:scrollbars="none" 
     android:overScrollMode="never"> 

    </android.support.v7.widget.RecyclerView> 

    <android.support.design.widget.FloatingActionButton 
     android:id="@+id/add_note" 
     app:backgroundTint="@color/options" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom|end" 
     android:layout_marginRight="@dimen/fab_margin_right" 
     android:layout_marginEnd="@dimen/fab_margin_right" 
     app:layout_anchorGravity="bottom|right|end" 
     android:layout_marginBottom="16dp" 
     android:src="@mipmap/add_note" 
     app:borderWidth="0dp" 
     android:elevation="6dp" 
     app:pressedTranslationZ="12dp" 
     app:fabSize="normal"/> 

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

Dank.

Answer 1

Ich glaube, Sie Ihr Layout Ziel angeben müssen, auf diese Weise:

<android.support.design.widget.FloatingActionButton 
... 
    android:layout_gravity="bottom|end|right" 
    app:layout_anchor="@id/notes" 
    app:layout_anchorGravity="bottom|right|end" 
/>