利用Environment.getExternalStorageState()可以取得External storage狀態
其中
Intent.ACTION_MEDIA_MOUNTED 來判斷是否有SD卡
Intent.ACTION_MEDIA_MOUNTED_READ_ONLY 來判斷SD卡是否唯讀
Intent.ACTION_MEDIA_UNMOUNTED 來判斷是否有SD卡是否沒接上
1. 官網http://developer.android.com/training/basics/data-storage/files.html#WriteExternalStorage
2. 以下是簡單的使用範例
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