Android初学------系统设置之获取USB设备管理

//获得挂载的USB设备的存储空间使用情况

public static String[] getUSBStorage(Context context){
// USB Storage
String[] str=new String[2];
//mnt/udisk为USB设备在Android设备上的挂载路径.不同厂商的Android设备路径不同。
//这样写同样适合于SD卡挂载。 /mnt/media_rw/udisk  or   /storage/udisk
File path = new File("/mnt/media_rw/udisk");
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
long availableBlocks = stat.getAvailableBlocks();
String totalSize=Formatter.formatFileSize(context, (totalBlocks) * blockSize);
//		      String usedSize = Formatter.formatFileSize(context, (totalBlocks-availableBlocks) * blockSize);
String availableSize = Formatter.formatFileSize(context, availableBlocks * blockSize);
str[0]=totalSize;
str[1]=availableSize;
return str;//空间:总共/可用的
}

mIMountService.unmountVolume(usbPath, true, false);

@Override
protected void onResume() {
super.onResume();
//监听usb设备
IntentFilter iFilter = new IntentFilter();
iFilter.addAction(Intent.ACTION_MEDIA_EJECT);
iFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
iFilter.addAction(Intent.ACTION_MEDIA_REMOVED);
iFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
iFilter.addDataScheme("file");
mBroadcastReceiver = new USBBroadCastReceiver();
registerReceiver(mBroadcastReceiver, iFilter);
}

public  class USBBroadCastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_MEDIA_EJECT)) {
//USB设备移除，更新UI
Toast.makeText(getApplicationContext(), "USB已弹出", 0).show();
updateUSBIsShow();
findUSBDevice=false;
} else if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {
//USB设备挂载，更新UI
findUSBDevice=true;
updateUSBIsShow();
}else if (action.equals(Intent.ACTION_MEDIA_REMOVED)){
Toast.makeText(getApplicationContext(), "移除", 0).show();
updateUSBIsShow();
findUSBDevice=false;
}else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED)){
//	        	Toast.makeText(getApplicationContext(), "未安装", 0).show();
updateUSBIsShow();
findUSBDevice=false;
}
}
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
//注销广播
unregisterReceiver(mBroadcastReceiver);
}