Wie Parallax Scrollen in Fragmenten Android

Question

implementieren Ich möchte den Parallax-Scroll-Effekt in einem Fragment zu implementieren, Activity enthält die Ansicht Pager, Ansicht Pager Elemente sind die Fragmente, Wie implementiere ich den Parallax Scroll-Effekt in ihm. Fragment Layout hat zwei Kinder. Ein Bild und TextView darunter. ImageView sollte Parallaxeneffekt haben.

Answer 1

Verwenden Sie den untenstehenden Code als Beispiel, schauen Sie genau hin, Sie sollten in der Lage zu erreichen, was Sie brauchen, kopieren Sie einfach den folgenden Code in Ihre Fragment-Layout-Datei und sehen, wie es aussieht, bevor Sie Ihr Layout für den Fall zu sichern zurück.

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

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed" 
     android:fitsSystemWindows="true" 
     app:contentScrim="?attr/colorPrimary" 
     app:expandedTitleMarginStart="48dp" 
     app:expandedTitleMarginEnd="64dp"> 

     <ImageView 
      android:id="@+id/backdrop" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:scaleType="centerCrop" 
      android:fitsSystemWindows="true" 
      app:layout_collapseMode="parallax" /> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_collapseMode="pin" /> 

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

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

<android.support.v4.widget.NestedScrollView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     android:paddingTop="24dp"> 

     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_margin="@dimen/card_margin"> 

      <LinearLayout 
       style="@style/Widget.CardContent" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="Info" 
        android:textAppearance="@style/TextAppearance.AppCompat.Title" /> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/cheese_ipsum" /> 

      </LinearLayout> 

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

     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="@dimen/card_margin" 
      android:layout_marginLeft="@dimen/card_margin" 
      android:layout_marginRight="@dimen/card_margin"> 

      <LinearLayout 
       style="@style/Widget.CardContent" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="Friends" 
        android:textAppearance="@style/TextAppearance.AppCompat.Title" /> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/cheese_ipsum" /> 

      </LinearLayout> 

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

     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="@dimen/card_margin" 
      android:layout_marginLeft="@dimen/card_margin" 
      android:layout_marginRight="@dimen/card_margin"> 

      <LinearLayout 
       style="@style/Widget.CardContent" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="Related" 
        android:textAppearance="@style/TextAppearance.AppCompat.Title" /> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/cheese_ipsum" /> 

      </LinearLayout> 

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

    </LinearLayout> 

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

<android.support.design.widget.FloatingActionButton 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    app:layout_anchor="@id/appbar" 
    app:layout_anchorGravity="bottom|right|end" 
    android:src="@drawable/ic_discuss" 
    android:layout_margin="@dimen/fab_margin" 
    android:clickable="true"/> 

Answer 2

Versuchen Sie, CollapsingToolBarLayout zu verwenden.