Activity记录

1. Activity的task相关

http://blog.youkuaiyun.com/liuhe688/article/details/6761337

2. Activity的四种launchMode

http://blog.youkuaiyun.com/liuhe688/article/details/6754323

3.全透明activity

    <style name="BackgroundOnlyTheme">
        <item name="android:windowBackground">@null</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowAnimationStyle">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowFullscreen">true</item>
        <item name="android:windowNoDisplay">true</item>
        <item name="android:windowIsFloating">true</item>
    </style>

然后在onCreate中添加finish();