【移動應用開發(fā)技術(shù)】andorid　storage total and free

【移動應用開發(fā)技術(shù)】andoridstoragetotalandfree

1在Setting應用中，storage顯示totalandfreecode: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);２VolumeInfo.java

是hidden的，只能通過反射得到。代碼如下：try

{

StorageManager

sManager

=

(StorageManager)

context.getSystemService(Context.STORAGE_SERVICE);

Class

class_StorageManager

=

StorageManager.class;

Method

method_getVolumes

=

class_StorageManager.getMethod("getVolumes");

List<Object>

volumes

=

(List<Object>)

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();

}得到數(shù)據(jù)：

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的數(shù)據(jù)。而private

是data的數(shù)據(jù)

３可以通過以下ｃｏｄｅ驗證：

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,

avai