ObjectAnimator不淡入 [英] ObjectAnimator not fading in

问题描述

我正在尝试使用Animator集顺序播放一组动画.除了alpha动画(set1)之外，其他所有东西都在工作.它从0.25f更改为1，但在整个动画中并没有褪色，并且在set1动画结束时，它从0.25更改为1，并且没有考虑setDuration(因此我没有得到渐隐效果).所以我没有淡入淡出的效果...当我自己制作动画时，淡入淡出的效果是....有什么想法吗?

I am trying to play a set of animations sequentially using the Animator set. Everything is working except for the alpha animation(set1). It is changing from 0.25f to 1 but it is not fading throughout the animation and at the end of the set1 animation it is changing from 0.25 to 1 and not taking in consideration the setDuration(as a result I am not getting the fade in effect). So I don't have the fade in effect... When I do this animation by itself the fade in effect is there....Any ideas?

我正在使用很棒的 nineoldandroids 库来实现此功能.

I am using the wonderful nineoldandroids library to implement this.

@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();
}   

推荐答案

在4.0以上版本上运行

While working on 4.0+

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

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