title: Android , Could I change NumberPicker to CharPicker {A+,A,B+,B.C+,C,D+,D,F}
body: <p>this is my code</p>
  
  <pre><code>np = (NumberPicker) findViewById(R.id.picker);
  np.setMaxValue(9);
  np.setValue(5);
  np.setMinValue(1);
  </code></pre>
  
  <p>Could picker view Char ?
  number = View</p>