Animation Android

I want create a splash screen, So i using animation. Now i want Anim scroll from left to mid ( change % become center_vertical or center_horizontal ). Sorry ! I speak English is not good.

Code xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://ift.tt/nIICcg"
     android:shareInterpolator="false">
  <translate android:fromXDelta="-220%" android:toXDelta="70%"<!--I want change 70% -> center_vertical-->
             android:fromYDelta="0%" android:toYDelta="0%"
             android:duration="1200"/>
</set>