code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  	public int getMaxEms (){
  		if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
  			return mInputView.getMaxEms();
  
  		return -1;
  	}
docs: @return the maximum width of the TextView, expressed in ems or -1 if the maximum width
  was set in pixels instead (using {@link #setMaxWidth(int)} or {@link #setWidth(int)}).
  
  @see #setMaxEms(int)
  @see #setEms(int)
  
  @attr ref android.R.styleable#TextView_maxEms