/获取存储卡路径/FilesdcardDir=Environment.getExternalStorageDirectory();/StatFs看文件系统空间使用情况/StatFsstatFs=newStatFs(sdcardDir.getPath());/Block的size/LongblockSize=statFs.getBlockSize();/总Block数量/LongtotalBlocks=statFs.getBlockCount();/已使用的Block数量/LongavailableBlocks=statFs.getAvailableBlocks();