android - 制作流畅的动画

Question

我有一个属性动画，但它不流畅，即我在动画中跳跃。我尝试使用动画师的参数，例如插值器、持续时间和帧延迟，但无法获得平滑的效果。有没有人有一些技巧/例子？这是我当前设置动画师的代码:

rotationAnimator=new ObjectAnimator();
rotationAnimator.setTarget(rotationController);
rotationAnimator.setPropertyName("mapRotation");
rotationAnimator.setInterpolator(new LinearInterpolator());
ValueAnimator.setFrameDelay(24);
rotationAnimator.setDuration(ROTATION_DURATION);
rotationAnimator.setRepeatCount(ValueAnimator.INFINITE);
rotationAnimator.setRepeatMode(ValueAnimator.RESTART);

(还有对 setFloatValues 的调用，但它出现在代码的后面，在我开始动画之前)

编辑:我被要求展示我正在制作的动画，所以这里是:

这是从动画中获取值的 setter 函数:

public void setMapRotation(float rotationDegrees)
{
    if ((rotationAnimator!=null)&&(rotationAnimator.isRunning()))
        rotationAnimator.cancel();
    rotationDegrees%=360;
    if (rotationDegrees<0) rotationDegrees+=360;
    rotationView.setRotationDegrees(rotationDegrees);
    if (rotationDegrees!=oldRotationDegrees)
    {
        notifyRotationListeners();
        oldRotationDegrees=rotationDegrees;
    }
}

如果您查看代码，您会看到调用了另一个函数 (setRotationDegrees)，所以这里是:

public void setRotationDegrees(float rotationDegrees)
{ 
    this.rotationDegrees=rotationDegrees%360;
    if (this.rotationDegrees<0) this.rotationDegrees+=360;
    Log.i("MapView","View degrees: " + this.rotationDegrees);
    invalidate();
}

这就是无效后发生的事情:

@Override protected void dispatchDraw(Canvas canvas)
{
    Log.i("MapView","Redrawing");
    int saveCount=canvas.save(Canvas.MATRIX_SAVE_FLAG);
    canvas.rotate(rotationDegrees,getWidth()/2,getHeight()/2);
    canvas.setDrawFilter(drawFilter);
    canvas.getMatrix(rotationMatrix);
    super.dispatchDraw(canvas);
    canvas.restoreToCount(saveCount);
}

我不知道这里有没有特别重的东西，但我可能是错的......

Answer 1

定义 AnimatorSet并在其上设置插值器可能会解决您的问题:

rotationAnimator=new ObjectAnimator();
rotationAnimator.setTarget(rotationController);
rotationAnimator.setPropertyName("mapRotation");
ValueAnimator.setFrameDelay(24);
rotationAnimator.setDuration(ROTATION_DURATION);
rotationAnimator.setRepeatCount(ValueAnimator.INFINITE);
rotationAnimator.setRepeatMode(ValueAnimator.RESTART);

AnimatorSet animatorSet = new AnimatorSet();
animatorSet.getChildAnimations().add(rotationAnimator);
animatorSet.setInterpolator(new LinearInterpolator());
...
animatorSet.start();