@Override
 public void dispatchDemoCommand(String command, Bundle args) {
   if (getVisibility() == View.VISIBLE) {
     if (!mDemoMode && command.equals(COMMAND_ENTER)) {
       mDemoMode = true;
       mDemoTracker.level = mTracker.level;
       mDemoTracker.plugged = mTracker.plugged;
     } else if (mDemoMode && command.equals(COMMAND_EXIT)) {
       mDemoMode = false;
       postInvalidate();
     } else if (mDemoMode && command.equals(COMMAND_BATTERY)) {
       String level = args.getString("level");
       String plugged = args.getString("plugged");
       if (level != null) {
         mDemoTracker.level = Math.min(Math.max(Integer.parseInt(level), 0), 100);
       }
       if (plugged != null) {
         mDemoTracker.plugged = Boolean.parseBoolean(plugged);
       }
       postInvalidate();
     }
   }
 }