MonoDroid 'hello world' examples (simple, layout-less sample app)

HelloWorldActivity.cs

using Android.App;
using Android.OS;
using Android.Widget;

namespace Demo
{
    [Activity(Label = "HelloWorld", MainLauncher = true)]
    public class HelloWorldActivity : Activity
    {
        int count = 0;
        Button b;
        //TextView tv;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            b = new Button(this);
            b.SetText("Click me", TextView.BufferType.Normal);
            b.Click += delegate { b.Text = string.Format("{0} clicks!", ++count); };
            SetContentView(b);    // example #1

            #region Example 2
            //tv = new TextView(this);
            //tv.SetText("Welcome to MonoDroid...", Android.Widget.TextView.BufferType.Normal);
            //LinearLayout ll = new LinearLayout(this);
            //ll.Orientation = Orientation.Vertical;
            //ll.AddView(tv);
            //ll.AddView(b);
            //SetContentView(ll);    // example #2
            #endregion
            #region Example 3
            //RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(200, 50);
            //b.LayoutParameters = rlp;
            //tv.LayoutParameters = rlp;
            //RelativeLayout rl = new RelativeLayout(this);
            //rl.AddView(tv);
            //rl.AddView(b);
            //SetContentView(rl);    // example #3
            #endregion
        }
    }
}