bug fix

chenke

2017-08-04 252c803d51fa07a55adc46efa9467741801e66c4

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