code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
      public CharSequence getCompletionHint() {
          if(mAutoCompleteMode == AUTOCOMPLETE_MODE_NONE || Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
              return null;
          return ((AutoCompleteTextView)mInputView).getCompletionHint();
      }
docs: Gets the optional hint text displayed at the bottom of the the matching list.
  <p>Only work when autoComplete mode is {@link #AUTOCOMPLETE_MODE_SINGLE} or {@link #AUTOCOMPLETE_MODE_MULTI}</p>
  
  @return The hint text, if any
  
  @see #setCompletionHint(CharSequence)
  
  @attr ref android.R.styleable#AutoCompleteTextView_completionHint