轉載：http://blog.csdn.net/xinzheng_wang/article/details/7827775

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Android 判斷SD卡是否存在及容量查詢的簡單方法如下：
首先要在AndroidManifest.xml中增加SD卡訪問權限

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1. <!--?在SDCard中創建與刪除文件權限?-->??
2. <uses-permission?android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>??
3. <!--?往SDCard寫入數據權限?-->??
4. <uses-permission?android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>???

SD卡是否存在

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1. private?boolean?ExistSDCard()?{??
2. ??if?(android.os.Environment.getExternalStorageState().equals(??
3. ????android.os.Environment.MEDIA_MOUNTED))?{??
4. ???return?true;??
5. ??}?else??
6. ???return?false;??
7. ?}??

SD卡剩余空間

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1. public?long?getSDFreeSize(){??
2. ?????//取得SD卡文件路徑??
3. ?????File?path?=?Environment.getExternalStorageDirectory();???
4. ?????StatFs?sf?=?new?StatFs(path.getPath());???
5. ?????//獲取單個數據塊的大小(Byte)??
6. ?????long?blockSize?=?sf.getBlockSize();???
7. ?????//空閑的數據塊的數量??
8. ?????long?freeBlocks?=?sf.getAvailableBlocks();??
9. ?????//返回SD卡空閑大小??
10. ?????//return?freeBlocks?*?blockSize;??//單位Byte??
11. ?????//return?(freeBlocks?*?blockSize)/1024;???//單位KB??
12. ?????return?(freeBlocks?*?blockSize)/1024?/1024;?//單位MB??
13. ???}??????

SD卡總容量

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1. 1. public?long?getSDAllSize(){??
   2. ?????//取得SD卡文件路徑??
   3. ?????File?path?=?Environment.getExternalStorageDirectory();???
   4. ?????StatFs?sf?=?new?StatFs(path.getPath());???
   5. ?????//獲取單個數據塊的大小(Byte)??
   6. ?????long?blockSize?=?sf.getBlockSize();???
   7. ?????//獲取所有數據塊數??
   8. ?????long?allBlocks?=?sf.getBlockCount();??
   9. ?????//返回SD卡大小??
   10. ?????//return?allBlocks?*?blockSize;?//單位Byte??
   11. ?????//return?(allBlocks?*?blockSize)/1024;?//單位KB??
   12. ?????return?(allBlocks?*?blockSize)/1024/1024;?//單位MB??
   13. ???} ? ? ?

轉載于:https://www.cnblogs.com/ruiati/p/3364989.html

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