SwipeRefreshLayout.java 文件源码

private void startScaleDownReturnToStartAnimation(int from, AnimationListener listener) {
    this.mFrom = from;
    if (isAlphaUsedForScale()) {
        this.mStartingScale = (float) this.mProgress.getAlpha();
    } else {
        this.mStartingScale = ViewCompat.getScaleX(this.mCircleView);
    }
    this.mScaleDownToStartAnimation = new Animation() {
        public void applyTransformation(float interpolatedTime, Transformation t) {
            SwipeRefreshLayout.this.setAnimationProgress(SwipeRefreshLayout.this.mStartingScale + ((-SwipeRefreshLayout.this.mStartingScale) * interpolatedTime));
            SwipeRefreshLayout.this.moveToStart(interpolatedTime);
        }
    };
    this.mScaleDownToStartAnimation.setDuration(150);
    if (listener != null) {
        this.mCircleView.setAnimationListener(listener);
    }
    this.mCircleView.clearAnimation();
    this.mCircleView.startAnimation(this.mScaleDownToStartAnimation);
}