IntentFilter intentFilter = new IntentFilter();

  intentFilter.addAction(Intent.ACTION_UMS_CONNECTED);
  intentFilter.addAction(Intent.ACTION_UMS_DISCONNECTED);

  mReceiver = new BroadcastReceiver() {
   @Override
   public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    String action = intent.getAction();
    if (action.equals(Intent.ACTION_UMS_CONNECTED) == true) {
     Toast.makeText(TimeCheckTest.this, "USB Connect",
       Toast.LENGTH_SHORT).show();
    } else if (action.equals(Intent.ACTION_UMS_DISCONNECTED) == true) {
     Toast.makeText(TimeCheckTest.this, "USB Disconnect",
       Toast.LENGTH_SHORT).show();
    }
   }
  };

  registerReceiver(mReceiver, intentFilter);

usb의 인식유무를 확인하는 코드입니다. 나머지는 본인이^^