add library

houxiao

2017-03-23 d7dec3b8ce547916dce7e896dfc4df5189f36066

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<?xml version="1.0" encoding="utf-8"?> 
<alpha 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:fromAlpha="1.0" 
    android:toAlpha="0.0" 
    android:duration="300"/>