模仿饿了么加载效果
#System Requirement
Android API 11+， Because of the use of ValueAnimation， if you want use it on API 8, please use NineoldAndroids library in your project.
#Usage
loadingView.addBitmap(R.mipmap.v4);
or
loadingView.addBitmap(bitmap);
or
loadingView.addBitmaps(mBitmapList);
//set the shadow color
loadingView.setShadowColor(Color.LTGRAY);
//set the duration of animation
loadingView.setDuration(800);
loadingView.start();