@Nullable
    public static ViewPropertyAnimator makeScaleDownAnimation(Activity a) {
        Rect to = a.getIntent().getSourceBounds();
        return to != null ? makeScaleDownAnimation(a, to) : null;
    }
@Nullable
    public static ViewPropertyAnimator makeScaleDownAnimation(Activity a) {
        Rect to = a.getIntent().getSourceBounds();
        return to != null ? makeScaleDownAnimation(a, to) : null;
    }
@ Nullable public static ViewPropertyAnimator makeScaleDownAnimation ( Activity a ) { Rect to = a . getIntent ( ) . getSourceBounds ( ) ; return to != null ? makeScaleDownAnimation ( a , to ) : null ; }
Scale the Activity down to the rectangle provided by its
{@link Intent#getSourceBounds() getIntent().getSourceBounds()}. To see the Activity behind
this one, you must include the below attributes[1] in your Activity theme. You may further
modify the animator, for example to fade out the Activity by decreasing its
{@link ViewPropertyAnimator#alpha(float) alpha} and/or set an
{@link ViewPropertyAnimator#withEndAction(Runnable) end action} that finishes the Activity.
When finishing the Activity in this way, you may wish to also call
{@link Activity#overridePendingTransition(int, int) Activity.overridePendingTransition(0,
0)} in order to prevent the system Activity close animation from running.
<p>
1. Activity theme attributes
</p>
{@code <item name="android:windowBackground">@android:color/transparent</item>}<br/>
{@code <item name="android:windowIsTranslucent">true</item>}

@return null when the Activity's Intent does not have
{@link Intent#getSourceBounds() source bounds}
@see ActivityOptions#makeScaleUpAnimation(View, int, int, int, int)
Scale the Activity down to the rectangle provided by its { @link Intent#getSourceBounds () getIntent () . getSourceBounds () } . To see the Activity behind this one you must include the below attributes [ 1 ] in your Activity theme . You may further modify the animator for example to fade out the Activity by decreasing its { @link ViewPropertyAnimator#alpha ( float ) alpha } and / or set an { @link ViewPropertyAnimator#withEndAction ( Runnable ) end action } that finishes the Activity . When finishing the Activity in this way you may wish to also call { @link Activity#overridePendingTransition ( int int ) Activity . overridePendingTransition ( 0 0 ) } in order to prevent the system Activity close animation from running . <p > 1 . Activity theme attributes < / p > { @code <item name = android : windowBackground > @android : color / transparent< / item > } <br / > { @code <item name = android : windowIsTranslucent > true< / item > }