在编码时，要对sdcard进行写入或删除操作时候要给与WRITER_EXTERNAL_STORAGE权限
在AndroidManifest.xml中加入
<uses-permission android:name=”android.permission.WRITE_EXTERNAL_STORAGE” />
其他权限：
<uses-permission android:name=”android.permission.READ_CONTACTS” />
<uses-permission android:name=”android.permission.WRITE_CONTACTS” />
<uses-permission android:name=”android.permission.VIBRATE” />
<uses-permission android:name=”android.permission.ACCESS_COARSE_LOCATION” />
<uses-permission android:name=”android.permission.INTERNET” />
<uses-permission android:name=”android.permission.SET_WALLPAPER” />
<uses-permission android:name=”android.permission.WRITE_EXTERNAL_STORAGE” />
<uses-permission android:name=”android.permission.SEND_SMS” />
<uses-permission android:name=”android.permission.RECEIVE_SMS” />
<!– We will request access to the camera, saying we require a camera
of some sort but not one with autofocus capability. –>
<uses-permission android:name=”android.permission.CAMERA” />
<uses-feature android:name=”android.hardware.camera” />
<uses-feature android:name=”android.hardware.camera.autofocus” android:required=”false” />
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