code: @TargetApi(Build.VERSION_CODES.LOLLIPOP)
      public float getLetterSpacing (){
  		return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? mInputView.getLetterSpacing() : 0;
  	}
docs: @return the extent by which text is currently being letter-spaced.
  This will normally be 0.
  
  @see #setLetterSpacing(float)
  @see android.graphics.Paint#setLetterSpacing