动画结束后更改视图位置 [英] Change position of view after end of animation

问题描述

我开发基于的ViewGroup 窗口小部件，我的问题是，我需要保存动画结束后项目的位置。我叫 setFillAfter（真）在我创建的动画对象 AnimationListener ，并在它的 onAnimationEnd 方法调用 View.layout（L，T，R，B）来设置动画后的位置，因为我想动画新项目的位置开始下次。但在这种情况下，它看起来像数据项都layouted两次。如果我不使用 View.layout（L，T，R，B）在动画结束，下一个动画开始于previous位置。这是我的code：

I develop a widget based on ViewGroup and my problem is that I need to save position of items after the end of animation. I called setFillAfter(true) in my animation object I created AnimationListener and in it's onAnimationEnd method call View.layout(l,t,r,b) to set the position after animation, because I want animation to start from new item's position next time. But in this case it looks like items are layouted twice. If I don't use View.layout(l,t,r,b) at the end of animation, next animation starts from previous position. Here is my code:

private void scrollUp() {
    for(int i = 0; i < getChildCount(); i++) {
        final View child = getChildAt(i);
        final int index = i; 
        final int newleft = child.getLeft() + mOffsetBetweenItems;
        final int newTop = child.getTop() - mOffsetBetweenItems;
        TranslateAnimation scrollUp = new TranslateAnimation(0, mOffsetBetweenItems, 0, -mOffsetBetweenItems);          
        scrollUp.setDuration(1500);
        scrollUp.setFillAfter(true);        
        scrollUp.setAnimationListener(
            new AnimationListener() {

                @Override
                public void onAnimationStart(Animation animation) {}

                @Override
                public void onAnimationRepeat(Animation animation) {}

                @Override
                public void onAnimationEnd(Animation animation) {
                    child.layout(newleft, newTop, newleft + child.getMeasuredWidth(), newTop + child.getMeasuredHeight() );
                }
            }
        );

        child.startAnimation(scrollUp);
    }
}

请给我一个建议，我应该如何相应地重新设置视图的位置，以动画的结束位置？

Please give me an advice how should I reset view's position accordingly to the end position of animation?

推荐答案

我做到了。这里是code：

I did it. Here is the code:

private void scrollUp() {
    for(int i = 0; i < getChildCount(); i++) {
        final View child = getChildAt(i);
        final int index = i; 
        final int newleft = child.getLeft() + mOffsetBetweenItems;
        final int newTop = child.getTop() - mOffsetBetweenItems;
        TranslateAnimation scrollUp = new TranslateAnimation(0, mOffsetBetweenItems, 0, -mOffsetBetweenItems);          
        scrollUp.setDuration(1500);
        scrollUp.setFillEnabled(true);        
        scrollUp.setAnimationListener(
            new AnimationListener() {

                @Override
                public void onAnimationStart(Animation animation) {}

                @Override
                public void onAnimationRepeat(Animation animation) {}

                @Override
                public void onAnimationEnd(Animation animation) {
                    child.layout(newleft, newTop, newleft + child.getMeasuredWidth(), newTop + child.getMeasuredHeight() );
                }
            }
        );

        child.startAnimation(scrollUp);
    }
}

只是删除​​ setFillAfter（真）写 setFillEnabled（真）代替。但在这种情况下，我不明白 setFillEnabled（）工作的逻辑，因为它提供的行为不象描述文件。

Just removed setFillAfter(true) and write setFillEnabled(true) instead of. But in this case I don't understand the logic of setFillEnabled() working, because it provides behavior not like describes in documentation.

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