Activity设置透明背景

<?xml version="1.0" encoding="UTF-8"?>
<resources>

<color name="transparent">#0000000</color>

</resources>

<style name="AtyBgTransparent">
<item name="android:windowBackground">@color/transparent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item>
</style>

android:theme="@style/<span style="font-family: Arial, Helvetica, sans-serif;">AtyBgTransparent</span><span style="font-family: Arial, Helvetica, sans-serif;">"  </span>