同时对动画进行翻转和缩放

Question

我想把某个视图从任意位置移动到屏幕的中央并按比例缩放。如果这太复杂，逐个进行平移和缩放也可以接受。但我都做不到。我认为问题出在枢轴点上。但很遗憾，我找不到解决方案。请帮忙。也许对于游戏开发者来说这很容易，而我对此一无所知。

下面是我的代码：

private void moveViewToScreenCenter( final View view ){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics( dm );
    int statusBarOffset = dm.heightPixels - rootLayout.getMeasuredHeight();

    int originalPos[] = new int[2];
    view.getLocationOnScreen( originalPos );

    int xDelta = (dm.widthPixels - view.getMeasuredWidth())/2 - originalPos[0];
    int yDelta = (dm.heightPixels - view.getMeasuredHeight())/2 + statusBarOffset - originalPos[1];

    AnimationSet animSet = new AnimationSet(true);
    animSet.setFillAfter(true);
    animSet.setDuration(1000);
    animSet.setInterpolator(new BounceInterpolator());
    TranslateAnimation translate = new TranslateAnimation( 0, xDelta , 0, yDelta);
    animSet.addAnimation(translate);
    ScaleAnimation scale = new ScaleAnimation(1f, 2f, 1f, 2f, ScaleAnimation.RELATIVE_TO_PARENT, .5f, ScaleAnimation.RELATIVE_TO_PARENT, .5f);
    animSet.addAnimation(scale);
    view.startAnimation(animSet);
}

更新： 上述代码可以处理来自左上区域的图像视图，来自右下区域的图像视图会沿着对角线穿过屏幕并消失。

- user1105115

Answer 1

经过许多令人绝望的尝试，我终于成功了，这太惊人了。

以下是代码，它可以用来将布局中的任何视图移动到该布局的中心：

private void moveViewToScreenCenter( final View view ){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics( dm );

    int originalPos[] = new int[2];
    view.getLocationOnScreen( originalPos );

    int xDelta = (dm.widthPixels - view.getMeasuredWidth() - originalPos[0])/2;
    int yDelta = (dm.heightPixels - view.getMeasuredHeight() - originalPos[1])/2;

    AnimationSet animSet = new AnimationSet(true);
    animSet.setFillAfter(true);
    animSet.setDuration(1000);
    animSet.setInterpolator(new BounceInterpolator());
    TranslateAnimation translate = new TranslateAnimation( 0, xDelta , 0, yDelta);
    animSet.addAnimation(translate);
    ScaleAnimation scale = new ScaleAnimation(1f, 2f, 1f, 2f, ScaleAnimation.RELATIVE_TO_PARENT, .5f, ScaleAnimation.RELATIVE_TO_PARENT, .5f);
    animSet.addAnimation(scale);
    view.startAnimation(animSet);
}

- user1105115

---

你的 animSet.setFillAfter(true); 救了我的一天 :) - User3

Answer 2

核心思想是：

AnimationSet animationSet = new AnimationSet(true);

animationSet.addAnimation(
  new TranslateAnimation(0f, 64f, 0f, 32f),
  new ScaleAnimation(1f, 0f, 1f, 0f, ScaleAnimation.RELATIVE_TO_PARENT, 0f, ScaleAnimation.RELATIVE_TO_PARENT, 0f););

myView.startAnimation(
  animationSet);

- Zon