android图片渐变动画效果

AlphaAnimation alpha=new AlphaAnimation(0.0f,0.1f);
alpha.setDuration(3000);//动画效果时间3秒
logoImg.setAnimation(alpha);
alpha.setAnimationListener(new AnimationListener() {

@Override//动画效果前执行
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub

}

@Override//动画效果中执行
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub

}

@Override//动画效果后执行
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub
Intent intent=new Intent(LogoActivity.this,LoginActivity.class);
startActivity(intent);
}
});