Android: with RippleEffect & StateListAnimator

问题

I have a layout, that includes another layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical"
          android:id="@+id/layout1">

    <include layout="@layout/my_layout"/>
</LinearLayout>

I need to add a RippleEffect as well as a StateListAnimator to the included layout.

Example:

<include layout="@layout/my_layout"
          android:stateListAnimator="@anim/lift_up"
          android:background="@drawable/ripple_effect"/>

Both the RippleEffect and StateListAnimator work 100%. I cannot alter the included layout. Thus the reason why I need to do the effects either on the include tag or the parent layout itself.

I have tried both techniques, none of which have been successful.

UPDATE

If possible, this should be down programmatically.

UPDATE 2

Secondly, how would I go about keep the View elevated, once it has animated?

回答1:

You need to find the view and call the appropriate method to change the state list animator and the background. You might need to also call setClickable on the root view of you included layout.

LinearLayout layout1 = findViewById(R.id.layout1);
View root = layout1.getChildAt(0);

StateListAnimator sla = AnimatorInflater.loadStateListAnimator(context, R.anim.lift_up); 
root.setStateListAnimator(sla);
root.setBackground(R.drawable.ripple_effect);

回答2:

Based on the thread Does Android XML Layout's 'include' Tag Really Work? and LayoutInflater.java it seems <include> tag only supports android:id, layout_* and android:visibility attributes. So your code to set background and stateListAnimator have no effect.

To fix the below issue with @Stepane's code :

your method enables the ripple effect properly, however the SLA isn't fired. I cannot see any elevation taking place

If the inflated view is transparent, then the elevation is not visible, you have to set viewOutline or use some non-transparent color for the view to see the shadow.

An extract from ViewOutlineProvider documentation:

Interface by which a View builds its Outline, used for shadow casting and clipping.

To set the outlineProvider you can make use of View#setOutlineProvider (ViewOutlineProvider provider) method or you can set via android:outlineProvider xml tag.

Updated Code:

LinearLayout root =(LinearLayout) findViewById(R.id.container);
StateListAnimator sla = AnimatorInflater.loadStateListAnimator(this, R.animator.lift_up);
root.setStateListAnimator(sla);
root.setClickable(true);
root.setOutlineProvider(ViewOutlineProvider.PADDED_BOUNDS);
root.setBackground(ContextCompat.getDrawable(this, R.drawable.ripple_effect));

ripple_effect.xml

<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:color="?android:colorAccent"
    tools:ignore="NewApi">
  <item>
    <shape
        android:shape="rectangle">
        <solid android:color="@android:color/transparent"/>            
        <!-- Doesn't require outlineProvider
        <solid android:color="@android:color/darker_gray"/>
        -->
    </shape>
  </item>
</ripple>

res/animator/lift_up.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item
      android:state_enabled="true"
      android:state_pressed="true">
    <objectAnimator
        android:duration="@android:integer/config_shortAnimTime"
        android:propertyName="translationZ"
        android:valueTo="48dp"/>
  </item>
  <item>
    <objectAnimator
        android:duration="@android:integer/config_shortAnimTime"
        android:propertyName="translationZ"
        android:valueTo="0dp"/>
  </item>
</selector>

来源：https://stackoverflow.com/questions/34673988/android-include-with-rippleeffect-statelistanimator

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android