Android获取SD卡总容量，可用大小，机身内存总容量及可用大小的系统方法

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/**      * 获得SD卡总大小      *       * @return      */      private String getSDTotalSize() {          File path = Environment.getExternalStorageDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long totalBlocks = stat.getBlockCount();          return Formatter.formatFileSize(MainActivity.this, blockSize * totalBlocks);      }        /**      * 获得sd卡剩余容量，即可用大小      *       * @return      */      private String getSDAvailableSize() {          File path = Environment.getExternalStorageDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long availableBlocks = stat.getAvailableBlocks();          return Formatter.formatFileSize(MainActivity.this, blockSize * availableBlocks);      }        /**      * 获得机身内存总大小      *       * @return      */      private String getRomTotalSize() {          File path = Environment.getDataDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long totalBlocks = stat.getBlockCount();          return Formatter.formatFileSize(MainActivity.this, blockSize * totalBlocks);      }        /**      * 获得机身可用内存      *       * @return      */      private String getRomAvailableSize() {          File path = Environment.getDataDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long availableBlocks = stat.getAvailableBlocks();          return Formatter.formatFileSize(MainActivity.this, blockSize * availableBlocks);      }

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