SwipeToRefreshLayout.java 文件源码

private void startScaleUpAnimation(Animation.AnimationListener listener) {
    mLoadingView.setVisibility(View.VISIBLE);
    if (android.os.Build.VERSION.SDK_INT >= 11) {
        mProgress.setAlpha(255);
    }
    Animation mScaleAnimation = new Animation() {
        @Override
        public void applyTransformation(float interpolatedTime, Transformation t) {
            setAnimationProgress(interpolatedTime);
        }
    };
    mScaleAnimation.setDuration(getResources().getInteger(android.R.integer.config_mediumAnimTime));
    if (listener != null) {
        mLoadingView.setAnimationListener(listener);
    }
    mLoadingView.clearAnimation();
    mLoadingView.startAnimation(mScaleAnimation);
}