Xamarin.Android Dialogs Simple Alert Dialog Example

Example

We shall create a simple Alert Dialog in Xamarin.Android

Now considering you have gone through the getting started guide from the documentation.

You must be having the project structure like this:

Your Main Activity must be looking like this:

 public class MainActivity : Activity
 {
 int count = 1;
 
 protected override void OnCreate(Bundle bundle)
 {
 base.OnCreate(bundle);
 
 // Set our view from the "main" layout resource
 SetContentView(Resource.Layout.Main);
 
 // Get our button from the layout resource,
 // and attach an event to it
 Button button = FindViewById<Button>(Resource.Id.MyButton);
 
 button.Click += delegate { button.Text = string.Format("{0} clicks!", count++); };
 }
 }

Now What we shall do is, instead of adding one to the counter on button click, we shall ask user if he wants to add or substract one in a simple Alert Dialog

And on Click of the Positive or the negative button we will take the action.

 button.Click += delegate {
 AlertDialog.Builder alert = new AlertDialog.Builder(this);
 alert.SetTitle("Specify Action");
 alert.SetMessage("Do you want to add or substract?");

 alert.SetPositiveButton("Add", (senderAlert, args) =>
 {
 count++;
 button.Text = string.Format("{0} clicks!", count);
  });

  alert.SetNegativeButton("Substract", (senderAlert, args) =>
  {
  count--;
  button.Text = string.Format("{0} clicks!", count);
  });

  Dialog dialog = alert.Create();
      dialog.Show();
 };

screenshot: