title: How to set layout params to units dp android
body: <pre><code>mainLayout = (LinearLayout) findViewById(R.id.linearLayout);
  mChart = new HorizontalBarChart(this);
  mChart.setLayoutParams(new ViewGroup.LayoutParams(
                  ViewGroup.LayoutParams.MATCH_PARENT,
                  ViewGroup.LayoutParams.WRAP_CONTENT));
  mainLayout.addView(mChart);
  </code></pre>
  
  <p>I like to change the width and height to dp units like 100 dp or 200 dp,. the setLayoutParams doesn't take number units , the choices are only (wrap_content and match_content).. I'm new to Android so im confused how to change it.</p>