code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  	public float getLineSpacingExtra (){
  		if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
  			return mInputView.getLineSpacingExtra();
  		return 0f;
  	}
docs: Gets the line spacing extra space
  
  @return the extra space that is added to the height of each lines of this TextView.
  
  @see #setLineSpacing(float, float)
  @see #getLineSpacingMultiplier()
  
  @attr ref android.R.styleable#TextView_lineSpacingExtra