ObjectAnimator没有淡入

Question

我正在尝试使用该Animator集顺序播放一组动画.除了alpha动画(set1)之外,一切正常.它从0.25f变为1但在整个动画中并没有消失,在动画结束时set1它从0.25变为1而没有考虑到setDuration(因此我没有得到淡入效果).所以我没有淡出效果......当我自己做这个动画时,淡入效果就在那里......任何想法？

我正在使用精彩的nineoldandroids库来实现这一点.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final ImageView image = (ImageView) findViewById(R.id.image);
    final AnimatorSet set = new AnimatorSet();
    set.play(ObjectAnimator.ofFloat(image, "translationX", 0, 100).setDuration(3000));

    final AnimatorSet set1 = new AnimatorSet();
    //THIS IS THE PROBLEMATIC ANIMATION!!
    set1.play(ObjectAnimator.ofFloat(image, "alpha", 0.25f, 1).setDuration(3000));

    final AnimatorSet set2 = new AnimatorSet();
    set2.play(ObjectAnimator.ofFloat(image, "translationX", 100, 200).setDuration(3000));

    final AnimatorSet set3 = new AnimatorSet();
    set3.playSequentially(set,set1,set2);
    set3.start();
}   

Answer 1

在4.0+上工作

ObjectAnimator alphaAnimation = ObjectAnimator.ofFloat(image, View.ALPHA, 0,1);

Answer 2

试试这个.

ObjectAnimator.ofFloat(image, "alpha", 0.25f, 1, 1)