title: MPAndroidChart PieChart how to change the center text to display the different color and font size
body: <p>Currently I use the MPAndroidChart from GITHUB and draw the piechart to display the two line text, each line has different color and different font size,I check the source codes and the center text is a string object, and try to use: </p>
  
  <pre><code>PAINT paint = pie_chart.getPaint(Chart.PAINT_CENTER_TEXT);
  </code></pre>
  
  <p>but looks like not work, would someone has the experience to do it and guide me about it.</p>