Android中查看USB连接的外接设备信息的代码实例

     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);

private 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    
       } else if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {

          //USB设备挂载，更新UI
        }
      }
 }

  //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 

      //storage/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。
      File path = new File("/storage/udisk");

      StatFs stat = new StatFs(path.getPath());
      long blockSize = stat.getBlockSize();
      long totalBlocks = stat.getBlockCount();
      long availableBlocks = stat.getAvailableBlocks();
      String usedSize = Formatter.formatFileSize(context, (totalBlocks-availableBlocks) * blockSize);
      String availableSize = Formatter.formatFileSize(context, availableBlocks * blockSize);
      return usedSize + " / " + availableSize;//空间:已使用/可用的
 }

     //获得外接USB输入设备的信息
     Process p=Runtime.getRuntime().exec("cat /proc/bus/input/devices");
     BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
     String line = null;
     while((line = in.readLine())!= null){
       String deviceInfo = line.trim();

       //对获取的每行的设备信息进行过滤，获得自己想要的。

     }  

    } catch (Exception e) {
  // TODO: handle exception
     e.printStackTrace();
    }