Android: 讓welcomeActivity漸現的效果

讓welcome頁面漸現的效果

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    final View view = View.inflate(this, R.layout.welcome, null);
    setContentView(view);
    //渐变展示启动屏
    AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);
    aa.setDuration(2000);
    view.startAnimation(aa);
    aa.setAnimationListener(new AnimationListener(){
        @Override
        public void onAnimationEnd(Animation arg0) {
        }
        @Override
        public void onAnimationRepeat(Animation animation) {}
        @Override
        public void onAnimationStart(Animation animation) {}
    });
}