title: Non static method issue
body: <p>After running a code inspection through android studio, it highlight that the MainHandler should be static. I move the class to static but now it complain that
  "Non-Static method remainingSecondsChanged(int) cannot be referenced from a static context"</p>
  
  <pre><code>public class CountDownView extends FrameLayout {
  
      private static void remainingSecondsChanged(int newVal) {
          mRemainingSecs = newVal;
          if (mListener != null) {
              mListener.onRemainingSecondsChanged(mRemainingSecs);
          }
  
          if (newVal == 0) {
              // Countdown has finished.
              setVisibility(View.INVISIBLE);
              if (mListener != null) {
                  mRemainingSecondsView.setText(null);
                  mRemainingSecondsView.setBackgroundResource(R.drawable.bracket_view_finder);
                  mListener.onCountDownFinished();
              }
          } else {
              Locale locale = getResources().getConfiguration().locale;
              String localizedValue = String.format(locale, "%d", newVal);
              mRemainingSecondsView.setText(localizedValue);
  
              // Schedule the next remainingSecondsChanged() call in 1 second
              mHandler.sendEmptyMessageDelayed(SET_TIMER_TEXT, 1000);
          }
      }
  
      public void startCountDown(int sec) {
          if (sec &lt; 0) {
              return;
          }
          if (sec == 0) {
              cancelCountDown();
          }
          mRemainingSecondsView.setBackgroundResource(R.drawable.bracket_count_down);
          setVisibility(View.VISIBLE);
          remainingSecondsChanged(sec);
      }
  
      private static class MainHandler extends Handler {
  
          @Override
          public void handleMessage(Message message) {
              if (message.what == SET_TIMER_TEXT) {
                  remainingSecondsChanged(mRemainingSecs - 1);
              }
          }
      }
  
      private static final MainHandler mHandler = new MainHandler();
  
  }
  </code></pre>
  
  <p>Any idea how to fix it ?</p>