@Override
        public void handleMessage(Message msg) {
          synchronized (mLock) {
            switch (msg.what) {
              case MSG_UPDATE_STATE:
                if (mConnected != mLastConnected || mConfiguration != mLastConfiguration) {
                  if (mConnected == 0) {
                    if (UsbManager.isFunctionEnabled(UsbManager.USB_FUNCTION_ACCESSORY)) {
                      // make sure accessory mode is off, and restore default functions
                      Log.d(TAG, "exited USB accessory mode");
                      if (!UsbManager.setFunctionEnabled(
                          UsbManager.USB_FUNCTION_ACCESSORY, false)) {
                        Log.e(TAG, "could not disable accessory function");
                      }
                      int count = mDefaultFunctions.size();
                      for (int i = 0; i < count; i++) {
                        String function = mDefaultFunctions.get(i);
                        if (!UsbManager.setFunctionEnabled(function, true)) {
                          Log.e(TAG, "could not reenable function " + function);
                        }
                      }

                      if (mCurrentAccessory != null) {
                        mDeviceManager.accessoryDetached(mCurrentAccessory);
                        mCurrentAccessory = null;
                      }
                    }
                  }

                  final ContentResolver cr = mContext.getContentResolver();
                  if (Settings.Secure.getInt(cr, Settings.Secure.DEVICE_PROVISIONED, 0) == 0) {
                    Slog.i(TAG, "Device not provisioned, skipping USB broadcast");
                    return;
                  }

                  mLastConnected = mConnected;
                  mLastConfiguration = mConfiguration;

                  // send a sticky broadcast containing current USB state
                  Intent intent = new Intent(UsbManager.ACTION_USB_STATE);
                  intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
                  intent.putExtra(UsbManager.USB_CONNECTED, mConnected != 0);
                  intent.putExtra(UsbManager.USB_CONFIGURATION, mConfiguration);
                  addEnabledFunctionsLocked(intent);
                  mContext.sendStickyBroadcast(intent);
                }
                break;
              case MSG_FUNCTION_ENABLED:
              case MSG_FUNCTION_DISABLED:
                functionEnabledLocked((String) msg.obj, msg.what == MSG_FUNCTION_ENABLED);
                break;
            }
          }
        }
 public void ding(int tick) {
   context.sendStickyBroadcast(new Intent(ACTION_JTT_TICK).putExtra(EXTRA_JTT, tick));
 }