title: Android calendar, How to draw a circle on selected date
body: <p>I have an android calendar, there's a dot under the selected date(or date has to-do events), what i want to do is draw a circle around the date number. Could anyone help me about this?</p>
  
  <pre><code>ImageView iw = (ImageView) v.findViewById(R.id.date_icon);
  if (conditionIsTrue) {
      iw.setVisibility(View.VISIBLE);
  } else {
      iw.setVisibility(View.INVISIBLE);
  }
  </code></pre>
  
  <p>The black dot under the given date is a dot image, every time the date is selected i make the dot visible. Unfortunately i cannot find a way make the circle arounded the date. Any help will be appreciated.</p>
  
  <p><img src="https://i.stack.imgur.com/EClQz.png" alt="enter image description here"> </p>
  
  <p>what i want to get:</p>
  
  <p><img src="https://i.stack.imgur.com/ijulv.png" alt="enter image description here"></p>