title: Android: how to center a button programatically created?
body: <p>I need to create a button programatically and have it centered on the layout, both horizontally and vertically. I am trying with the following code:</p>
  
  <pre><code>LinearLayout ll = (LinearLayout)findViewById(R.id.layoutItem);
  Button b = new Button(this);        
  b.setBackgroundDrawable(getResources().getDrawable(R.drawable.button));
  b.setLayoutParams(new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT)); 
  b.setGravity(Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL);
  ll.addView(b);
  </code></pre>
  
  <p>But it's not working. The button comes out on top all to the left.</p>
  
  <p>Any clues on how to fix this?</p>