interpolator-动画执行方式

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
        android:interpolator="@android:anim/linear_interpolator"
        android:shareInterpolator="true" >
</set>

Animation aa = new AlphaAnimation(0,1);
        aa.setInterpolator(this,android.R.anim.accelerate_decelerate_interpolator);