Android : Animate an Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Override how this activity is animated into view
// The new activity is pulled in from the left and the current activity is kept still
// This has to be called before onCreate
overridePendingTransition(R.anim.pull_in_from_left, R.anim.hold);

setContentView(R.layout.activity_sliding_drawer);
}

@Override
protected void onPause() {
// Whenever this activity is paused (i.e. looses focus because another activity is started etc)
// Override how this activity is animated out of view
// The new activity is kept still and this activity is pushed out to the left
overridePendingTransition(R.anim.hold, R.anim.push_out_to_left);
super.onPause();
}

res.anim.pull_in_from_left.xml

    android:duration="200"
    android:fromXDelta="-100%"
    android:interpolator="@android:anim/accelerate_interpolator"
    android:toXDelta="0%"

credit : http://blog.blundellapps.co.uk/animate-an-activity/