Parent directory of file is not writable: /sdca...

需要在配置文件中添加<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

另外几个有用的权限

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.WRITE_SETTINGS" />

<uses-permission android:name="android.permission.DELETE_CACHE_FILES" /> 

<uses-permission android:name="android.permission.RECORD_AUDIO" />

 <uses-permission android:name="android.permission.INSTALL_PACKAGES"/>

<uses-permission android:name="android.permission.READ_OWNER_DATA"/> 

<uses-permission android:name="android.permission.CLEAR_APP_USER_DATA"/> 

<uses-permission android:name="android.permission.DELETE_CACHE_FILES"/>

 

<uses-permission android:name="android.permission.DELETE_PACKAGES" />