Apoio para transições e shared elements apenas entre Activities

Transitions.java

//    http://guides.codepath.com/android/shared-element-activity-transition
//    https://medium.com/@andkulikov/animate-all-the-things-transitions-in-android-914af5477d50#.1jj56i6dy

  //Activity.class
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Helper.MakeActivitiesTransitions(this); //sempre antes de setContent
        setContentView(R.layout.activity_tv);

     //Helper.class
    public static void MakeActivitiesTransitions(Activity a){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Transition transition = new Explode();
            Transition transition_ = new Fade();
            a.getWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);
            a.getWindow().setEnterTransition(transition);
            a.getWindow().setExitTransition(transition);
            a.getWindow().setSharedElementEnterTransition(transition_);
            a.getWindow().setSharedElementExitTransition(transition_);

        }
    }
      
     //res/value-v21/style.xml
       <style name="MyAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:windowContentTransitions">true</item>
       </style>
         
     //Manifest
         <application
            android:theme="@style/MyAppTheme">
         </application>
              
  // OU SE QUISER USAR AS MESMAS TRANSIÇÕES PARA TODA A APLICAÇÃO POUPA MAIS TEMPO APLICANDO TUDO EM XML....
  //  //  //  //
              //  //  //  //
 
 //res/value-v21/style.xml
       <style name="MyAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="android:windowContentTransitions">true</item>
        <item name="android:windowEnterTransition">@transition/change_image_transform</item>
        <item name="android:windowExitTransition">@transition/change_image_transform</item>
        <item name="android:windowSharedElementEnterTransition">@transition/change_image_transform</item>
        <item name="android:windowSharedElementExitTransition">@transition/change_image_transform</item>
    </style>      
              
 //res/transition/change_image_transform.xml              
<?xml version="1.0" encoding="utf-8"?>
<transitionSet
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:transitionOrdering="sequential">

<!--    <fade android:fadingMode="fade_out" />
    <changeBounds />
    <fade android:fadingMode="fade_in" />-->
     <!-- //or />-->
    <explode />
    <changeBounds />
</transitionSet>