title: Add Button in Relative Layout
body: <p>I want to add some button in a Sliding Drawer's content, its content is a Relative Layout. 
  The button will be defined in Java code and the Relative Layout is already defined in xml layout. So, let's say i want to add 4 buttons:</p>
  
  <pre><code>for (int i=0; i&lt;4; i++) {
       Button btn = new Button(this);
       btn.setId(i);
       btn.setText("some_text");
  }
  </code></pre>
  
  <p>Then i initialize the Relative Layout:</p>
  
  <pre><code>RelativeLayout layout = (RelativeLayout)findViewById(R.id.slidingDrawerContent);
  </code></pre>
  
  <p>Now how do i add all of the Button into the Relative Layout? Thanks for the help.</p>