动画方法applyTransformation不会触发，直到我点击任何布局 [英] Animation method applyTransformation not triggered until I click any layout

问题描述

这是如此怪异，我有这个动画code：

This is so weird, I've this animation code:

public class ExpandAnimation extends Animation {
private View mAnimatedView;
private MarginLayoutParams mViewLayoutParams;
private int mMarginStart, mMarginEnd;
private boolean mWasEndedAlready = false;

/**
* Initialize the animation
* @param view The layout we want to animate
* @param duration The duration of the animation, in ms
*/
    public ExpandAnimation(View view, int duration) {
        setDuration(duration);
        mAnimatedView = view;
        mViewLayoutParams = (MarginLayoutParams) view.getLayoutParams();

        mMarginStart = mViewLayoutParams.rightMargin;
        mMarginEnd = (mMarginStart == 0 ? (0- view.getWidth()) : 0);
        view.setVisibility(View.VISIBLE);
        mAnimatedView.requestLayout();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        super.applyTransformation(interpolatedTime, t);
        if (interpolatedTime < 1.0f) {
            // Calculating the new bottom margin, and setting it
            mViewLayoutParams.rightMargin = mMarginStart
                    + (int) ((mMarginEnd - mMarginStart) * interpolatedTime);
            // Invalidating the layout, making us seeing the changes we made
            mAnimatedView.requestLayout();

        // Making sure we didn't run the ending before (it happens!)
        } else if (!mWasEndedAlready) {
            mViewLayoutParams.rightMargin = mMarginEnd;
            mAnimatedView.requestLayout();
            mWasEndedAlready = true;
        }
    }
}

和我用这个动画：

View parent = (View) v.getParent();
View containerMenu = parent.findViewById(R.id.containerMenu);
ExpandAnimation anim=new ExpandAnimation(containerMenu, 1000);
containerMenu.startAnimation(anim);

这动画切换布局hidding /显示它。

This animation toggle a layout hidding / showing it.

在默认情况下，其隐藏。当我点击，动画作品，它的显示。当我再次点击，它正确地收缩。但第三次，它什么都不做。我已经调试和我发现，调用构造函数的而不是 applyTransformation 。
不知怎么的，如果我点击屏幕上的任何布局，动画突然开始。

By default, its hidden. When I click, animation works and it's shown. When I click again, it shrinks correctly. But the 3rd time, it does nothing. I've debugged and I found out that the constructor is called but not applyTransformation. Somehow, if I click any layout around the screen, the animation suddenly starts.

任何想法？

修改
有谁知道什么时候被触发applyTransformation？

Edit Does anyone know WHEN is applyTransformation triggered?

推荐答案

我不明白为什么，但是当我点击或做任何布局的任何行动，动画终于启动。所以我加入编程一种解决方法。我在我的布局中滚动视图，所以我移动滚动的位置是：

I can't understand why, but when I click or do any action to any layout, the animation finally starts. So I programatically added a workaround. I've a scrollview in my layout, so I move the scroll position:

hscv.scrollTo(hscv.getScrollX()+1, hscv.getScrollY()+1);

这刚过 containerMenu.startAnimation（阿尼姆）;

这只是工作，我不明白这是为什么。

This just works, I can't understand why.

另外，我发现了一些动画制作的Andr​​oid> 4无瑕，但在2.3例如，它有同样的问题，努力扩大和缩小，而不是扩大第二次。

Also, I found out that some animations worked flawless on android > 4, but on 2.3 for instance, it had the same issue, worked to expand, and to shrink, but not to expand for the second time.

parent.invalidate();

做的伎俩。

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