`

Failed to ensure directory问题

 
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04-19 14:38:08.868: W/ContextImpl(17290): Failed to ensure directory: /storage/sdcard1/Android/data/xxxx/files/xxx-cache



在android4.0源码出来以后，关于sd卡问题似乎没有解决好，起码上层api中没有体现到位。其实在framework层中有相应的类去获得内外置sd卡信息，是否可读写的权限。
     在2.x的版本中，在manifest中配置的权限android.permission.WRITE_EXTERNAL_STORAGE确实是用来使得sd卡获得写的权限。而在4.0开发的源码当中，由于有了内外置sd卡的区分，android.permission.WRITE_EXTERNAL_STORAGE的权限用来设置了内置sd卡的写权限，如果在manifest中只是配置了这个权限，那个应用只能在内置sd卡中进行写操作，还是无法在外置sd卡中进行写操作。需要写外置sd卡的话，需要配置另一个权限android.permission.WRITE_MEDIA_STORAGE，这样就可以在外置sd卡中进行写入操作了。
这两个权限都被定义在android源码目录\frameworks\base\data\etc\platform.xml中：

    <permission name="android.permission.WRITE_EXTERNAL_STORAGE" >

    <group gid="sdcard_rw" />

    </permission>

    <permission name="android.permission.WRITE_MEDIA_STORAGE" >

    <group gid="media_rw" />

    </permission>
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