我需要将一个视图从状态A动画到B,并改变它的比例、位置和滚动。
以下代码几乎可以实现:
AnimationSet animation = new AnimationSet(true);
int fromXDelta = view.getScrollX();
int fromYDelta = view.getScrollY();
view.scrollTo(0, 0);
float scale = (float) widthB / (float) widthA;
// Calculate toXDelta and toYDelta
TranslateAnimation translateAnimation = new TranslateAnimation(-fromXDelta, -toXDelta, -fromYDelta, -toYDelta);
translateAnimation.setDuration(duration);
animation.addAnimation(translateAnimation);
ScaleAnimation scaleAnimation = new ScaleAnimation(1, scale, 1, scale);
scaleAnimation.setDuration(duration);
animation.addAnimation(scaleAnimation);
animation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationEnd(Animation arg0) {
view.clearAnimation();
// Change view to state B by modifying its layout params and scroll
}
@Override public void onAnimationRepeat(Animation arg0) {}
@Override public void onAnimationStart(Animation arg0) {}
});
view.startAnimation(animation);
onAnimationEnd 的逻辑使得动画结束后视图会闪烁。如果我不调用 clearAnimation(),动画就无法像预期那样正常工作(为什么?)。
这种做法正确吗?
谢谢!