Android为返回键设置动画效果

public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode == KeyEvent.KEYCODE_BACK) {
overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);
}
return super.onKeyDown(keyCode, event);
}

protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);
}