1 在Setting应用中，storage 显示total and free code:
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final File path = VolumeInfo.getPath();
final long freeBytes = path.getFreeSpace();
final long totalBytes = path.getTotalSpace();
final long usedBytes = totalBytes - freeBytes;
final String used = Formatter.formatFileSize(context, usedBytes);
final String total = Formatter.formatFileSize(context, totalBytes); ２ VolumeInfo.java 是hidden的，只能通过反射得到。代码如下： try {
StorageManager sManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
Class class_StorageManager = StorageManager.class;
Method method_getVolumes = class_StorageManager.getMethod("getVolumes");
List volumes = (List) method_getVolumes.invoke(sManager);
mClassType = Class.forName("android.os.storage.VolumeInfo");
for (Object volumeInfo : volumes) {
mGetMethod = mClassType.getDeclaredMethod("getPath");
File path = (File) mGetMethod.invoke(volumeInfo);
final long freeBytes = path.getFreeSpace();
final long totalBytes = path.getTotalSpace();
final long usedBytes = totalBytes - freeBytes;
Log.i("cyy1","freeBytes="+Formatter.formatFileSize(context,freeBytes));
Log.i("cyy1","usedBytes="+Formatter.formatFileSize(context,usedBytes));
mGetMethod１ = mClassType.getDeclaredMethod("getId");
String id = (String) mGetMethod１.invoke(volumeInfo);
Log.i("cyy1","id="+id);
}
}catch (Exception e){
Log.i("cyy1",e.getMessage());
e.printStackTrace();
} 得到数据：
08-18 17:28:31.087 32148-32148/ I/cyy1: freeBytes=190 MB
08-18 17:28:31.088 32148-32148/ I/cyy1: usedBytes=22.68 GB
08-18 17:28:31.088 32148-32148/ I/cyy1: id=private
08-18 17:28:31.088 32148-32148/ I/cyy1: freeBytes=9.90 MB
08-18 17:28:31.088 32148-32148 I/cyy1: usedBytes=22.84 GB
08-18 17:28:31.088 32148-32148/ I/cyy1: id=emulated 其中emulated 是external stroage的数据。而private 是data的数据
３ 可以通过以下ｃｏｄｅ验证：
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSizeLong();
long blockCount = stat.getBlockCountLong();
long availableBlocks = stat.getAvailableBlocksLong();
long avaibByte = stat.getAvailableBytes();
Log.i("cyy","avaibByte="+Formatter.formatFileSize(context,avaibByte));
long free= stat.getFreeBytes();
Log.i("cyy","free="+Formatter.formatFileSize(context,free));
String totalSize = Formatter.formatFileSize(context, blockCount*blockSize);
String availableSize = Formatter.formatFileSize(context, availableBlocks*blockSize);
Environment.getExternalStorageDirectory() 跟emulated 数据一致；Environment.getDataDirectory()
和private数据一致。
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