Android:如何对角扩展和缩小视图？

Question

我试图动画一个扩展和缩小回初始大小的视图.我尝试使用动画集添加两个动画,以便第二个动画将在第一个动画后开始,但无法使其正常工作.

AnimationSet expandAndShrink = new AnimationSet(true);
ScaleAnimation expand = new ScaleAnimation(
     1f, 1.5f, 
     1f, 1.5f,
     Animation.RELATIVE_TO_PARENT, 0,
     Animation.RELATIVE_TO_PARENT, 0);

ScaleAnimation shrink = new ScaleAnimation(
     1.5f, 1f, 
     1.5f, 1f,
     Animation.RELATIVE_TO_PARENT, 1f,
     Animation.RELATIVE_TO_PARENT, 1f);

expandAndShrink.addAnimation(expand);
expandAndShrink.addAnimation(shrink)
expandAndShrink.setFillAfter(true);
expandAndShrink.setDuration(1000);
expandAndShrink.setInterpolator(new AccelerateInterpolator(1.0f));

view.bringToFront();
view.startAnimation(expandAndShrink);

我真的很感激任何帮助它的工作.提前致谢

Answer 1

我修复了"扩展"和"收缩"动画,并增加了两者的持续时间.你还应该添加shrink.setStartOffset(1000); 所以第二个动画稍后开始

    AnimationSet expandAndShrink = new AnimationSet(true);
    ScaleAnimation expand = new ScaleAnimation(
         1f, 1.5f, 
         1f, 1.5f,
         Animation.RELATIVE_TO_PARENT, 0,
         Animation.RELATIVE_TO_PARENT, 0);
    expand.setDuration(1000);

    ScaleAnimation shrink = new ScaleAnimation(
         1.5f, 1f, 
         1.5f, 1f,
         Animation.RELATIVE_TO_PARENT, 0f,
         Animation.RELATIVE_TO_PARENT, 0f);
    shrink.setStartOffset(1000);
    shrink.setDuration(1000);

    expandAndShrink.addAnimation(expand);
    expandAndShrink.addAnimation(shrink);
    expandAndShrink.setFillAfter(true);
    expandAndShrink.setInterpolator(new AccelerateInterpolator(1.0f));

    view.startAnimation(expandAndShrink);