Android中获取rom的容量容量读取
File path = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(path.getPath());
long blocksize = sf.getBlockSizeLong();
long totalblocks = sf.getBlockCountLong();
//return Formatter.formatFileSize(getActivity(), blocksize * totalblocks);
return (blocksize * totalblocks) / 1024 / 1024 + "MB";
这里主要是用到了Environment类，获取外部存储的容量如下代码所示，获取的是/storage/sdcard 的容量
Environment.getExternalStorageDirectory()
可以用busybox df -h命令查看，分区的大小如下：
busybox df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 464.5M 56.0K 464.4M 0% /dev
tmpfs 464.5M 0 464.5M 0% /mnt
tmpfs 464.5M 0 464.5M 0% /mnt/secure
tmpfs 464.5M 0 464.5M 0% /mnt/asec
tmpfs 464.5M 0 464.5M 0% /mnt/obb
/dev/block/platform/soc/by-name/system 774.9M 592.1M 166.8M 78% /system
/dev/block/platform/soc/by-name/userdata 12.3G 403.2M 11.8G 3% /data
/dev/block/platform/soc/by-name/cache 774.9M 908.0K 758.0M 0% /cache
/data/media 12.2G 419.2M 11.7G 3% /storage/emulated
/data/media 12.2G 419.2M 11.7G 3% /storage/sdcard
如上所示，系统以及将/data/media挂载到了/stroage/sdcard的目录上。
利用如下的方法可以进行获取对应目录中的容量大小：
Environment.getExternalStoragePublicDirectory(DIRECTORY_XXX) //DIRECTORY有ALARMS DCIM MOVIES等等用于获取sdcard中的对应目录
Environment.getDataDirectory() //用于获取 /data 目录下的空间大小
Environment.getDownloadCacheDirectory() //用于获取 /cache 目录下的大小
Environment.getRootDirectory() //用于获取 /system 目录下的大小
