GestureRefreshLayout.java 文件源码

private void startScaleUpAnimation(Animation.AnimationListener listener) {
    mRefreshView.setVisibility(View.VISIBLE);
    if (android.os.Build.VERSION.SDK_INT >= 11) {
        // Pre API 11, alpha is used in place of scale up to show the
        // progress circle appearing.
        // Don't adjust the alpha during appearance otherwise.
        //mProgress.setAlpha(MAX_ALPHA);
    }
    mScaleAnimation = new Animation() {
        @Override
        public void applyTransformation(float interpolatedTime, Transformation t) {
            setAnimationProgress(interpolatedTime);
        }
    };
    mScaleAnimation.setDuration(mMediumAnimationDuration);
    mScaleAnimation.setAnimationListener(listener);
    mRefreshView.clearAnimation();
    mRefreshView.startAnimation(mScaleAnimation);
}