Question

我正在尝试将CardView（在RecycleView中）从实际宽度变为0.我是Android和Android动画中的新手。你能说我做错了什么吗？

这是我的代码：

final View v = cardViewHolder.cv;
int actualWidth = v.getMeasuredWidth();
ValueAnimator anim = ValueAnimator.ofInt(actualWidth, 0);
anim.setRepeatMode(ValueAnimator.REVERSE);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
     public void onAnimationUpdate(ValueAnimator valueAnimator) {
          int val = (Integer) valueAnimator.getAnimatedValue();
          ViewGroup.LayoutParams layoutParams = v.getLayoutParams();
          layoutParams.width = val;
          v.setLayoutParams(layoutParams);
    }
});
anim.setDuration(R.integer.card_flip_time_full);
anim.start();

使用断点我发现val总是728（宽度）并且永远不会改变。什么是我的失败？

Answer 1

我解决了它：

final View v = cardViewHolder.cv;
int actualWidth = v.getMeasuredWidth();
ValueAnimator anim = ValueAnimator.ofInt(actualWidth, 0);
anim.setRepeatMode(ValueAnimator.REVERSE);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
     public void onAnimationUpdate(ValueAnimator valueAnimator) {
          // This needs to be declared as Integer instead of int
          v.requestLayout(); // @mhenryk advice
          Integer val = (Integer) valueAnimator.getAnimatedValue();  
          int value = val.intValue();  // Then get the int value
          ViewGroup.LayoutParams layoutParams = v.getLayoutParams();
          layoutParams.width = value;
          v.setLayoutParams(layoutParams);
    }
});
anim.setDuration(R.integer.card_flip_time_full);
anim.start();

动画集视图宽度从X到0

1 个答案: