关于查看文件size

public static long getTotalSize(String device) {
StatFs sf = new StatFs (device);
//long totalblocks = sf.getBlockCountLong();
//long freeblocks = sf.getFreeBlocksLong();//为可用的，包含 系统保留的部分

long avablocks = sf.getAvailableBlocksLong();//可用的。不包含 系统保留的部分
long bsize = sf.getBlockSizeLong();

//long usedsize = totalblocks - freeblocks;

Log.e(TAG, "totalblocks = " + totalblocks);
Log.e(TAG, "totalblocksize = " + totalblocks*bsize/1024/1024);
Log.e(TAG, "freeblocks = " + freeblocks);
Log.e(TAG, "freeblocksize = " + freeblocks*bsize/1024/1024);
Log.e(TAG, "avablocks = " + avablocks);
Log.e(TAG, "avablocksize = " + avablocks*bsize/1024/1024);

Log.e(TAG, "usedsize = " + usedsize*bsize/1024/1024);


return 0;
}

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