PaymentRequestUI.java 文件源码

@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom,
        int oldLeft, int oldTop, int oldRight, int oldBottom) {
    if (mSheetAnimator != null) mSheetAnimator.cancel();

    mRequestView.removeOnLayoutChangeListener(this);
    mContainerHeightDifference = (bottom - top) - (oldBottom - oldTop);

    ValueAnimator containerAnimator = ValueAnimator.ofFloat(1f, 0f);
    containerAnimator.addUpdateListener(new AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            float alpha = (Float) animation.getAnimatedValue();
            update(alpha);
        }
    });

    mSheetAnimator = containerAnimator;
    mSheetAnimator.setDuration(DIALOG_ENTER_ANIMATION_MS);
    mSheetAnimator.setInterpolator(new LinearOutSlowInInterpolator());
    mSheetAnimator.addListener(this);
    mSheetAnimator.start();
}