ISwipeRefreshLayout.java 文件源码

@SuppressLint("NewApi")
private void startScaleDownReturnToStartAnimation(Animation.AnimationListener listener) {
    mStartingScale = mRefreshView.getScaleX();
    mScaleDownToStartAnimation = new Animation() {
        @Override
        public void applyTransformation(float interpolatedTime, Transformation t) {
            float targetScale = (mStartingScale + (-mStartingScale * interpolatedTime));
            setAnimationProgress(targetScale);
            moveToStart(interpolatedTime);
        }
    };
    mScaleDownToStartAnimation.setDuration(SCALE_DOWN_DURATION);
    if (listener != null) {
        mScaleDownToStartAnimation.setAnimationListener(listener);
    }
    mRefreshView.clearAnimation();
    mRefreshView.startAnimation(mScaleDownToStartAnimation);
}