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无缝为Activity、Fragment、任何View设置加载（loading）、重试(retry)和无数据（empty）页面。
a extends lib for android-percent-support(Google百分比布局库的扩展)
继承ProgressBar实现的两种风格的滚动条，非常容易理解。
字体或者图片可以逐渐染色和逐渐褪色的动画效果
单页显示3个Item的ViewPager炫酷切换效果，适用于Banner等。
a easy API to use runtime permission for Android M
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