android overidePendingTransition Scale

Intent intent=new Intent(MainActivity.this,Main2Activity.class);

startActivity(intent);

overridePendingTransition(R.anim.zoomin,R.anim.zoomout);

@Overridepublic void onBackPressed() {
    super.onBackPressed();    overridePendingTransition(R.anim.fade_in,R.anim.fade_out);}

XML file :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale        
          android:fromXScale="100%"        
          android:toXScale="0%"        
          android:fromYScale="100%"        
          android:toYScale="0%"        
          android:pivotX="50%"        
          android:pivotY="50%"        
          android:duration="1000"
        /></set>