4

我正在尝试构建一个动画,其中该图像:

没有酒吧

变成这个图像:

酒吧

三个小节像 1...2...3... 一样淡入,然后又变回无。此时动画将重复。这是我试图做的工作:

    AlphaAnimation anim = (AlphaAnimation) AnimationUtils.loadAnimation(this, R.anim.fade_in);
    anim.setRepeatMode(Animation.RESTART);
    anim.setRepeatCount(Animation.INFINITE);
    anim.setStartOffset(3000);

    LayoutAnimationController controller = new LayoutAnimationController(anim, 0.5f);

    rl.setLayoutAnimation(controller);

    rl.startLayoutAnimation();

几乎可以工作,但问题是这些 wifi 酒吧的视图组中的第一个孩子不会等待最后一个孩子在它关闭之前完成其动画。结果是一个看起来像 1...2...3..1..2.3...1...3...1..2.3 而不是漂亮的 1..2..3 的节拍。 .1..2..3。我需要找到一种方法让控制器等到循环完成后再设置第一个孩子。我还没有找到任何解决方案,有人有意见吗?我愿意完全改变我这样做的方式,这个 LayoutAnimationController 类似乎是迄今为止最好的方式。

谢谢!

4

1 回答 1

2

当我不得不为图像使用动画时,我准备了帧。我在这个类中使用了 AnimatioDrawable:

* This class is a hack to simply get an on finish callback for an
* AnimationDrawable.
*
*/
public class CustomAnimationDrawable extends AnimationDrawable {
// We need to keep our own frame count because mCurFrame in AnimationDrawable is private
private int mCurFrameHack = -1;

// This is the Runnable that we will call when the animation finishes
private Runnable mCallback = null;

/*
* We override the run method in order to increment the frame count the same
* way the AnimationDrawable class does. Also, when we are on the last frame we
* schedule our callback to be called after the duration of the last frame.
*/
@Override
public void run() {
super.run();

mCurFrameHack += 1;
if (mCurFrameHack == (getNumberOfFrames() - 1) && mCallback != null) {
scheduleSelf(mCallback, SystemClock.uptimeMillis() + getDuration(mCurFrameHack));
}
}

/*
* We override this method simply to reset the frame count just as is done in
* AnimationDrawable.
*/
@Override
public void unscheduleSelf(Runnable what) {
// TODO Auto-generated method stub
super.unscheduleSelf(what);
mCurFrameHack = -1;
}

public void setOnFinishCallback(Runnable callback) {
mCallback = callback;
}

public Runnable getOnFinishCallback() {
return mCallback;
}

}

在我的代码中,我像这样使用它:

        CustomAnimationDrawable staticAnimation = new CustomAnimationDrawable();
    //add frames with resources and duration. step is just a class of mine
        staticAnimation.addFrame(getResources().getDrawable(step.getStepImageResId()), step.getStepDuration());
    staticAnimation.addFrame(getResources().getDrawable(step.getStepImageResId()), step.getStepDuration());
    staticAnimation.addFrame(getResources().getDrawable(step.getStepImageResId()), step.getStepDuration());
        staticAnimation.setOneShot(false);

        imgView.setBackgroundDrawable(staticAnimation);
staticAnimation.start();

可能不是最好的解决方案,但它满足我的需求。

于 2012-06-28T20:22:33.733 回答