Alert dialogs

In many apps, we will require some input from the user or a decision to be made. The decision may require a response before the app can continue.

How to do it...

If we want a decision to be made, we can use a pop-up dialog. This is achieved by using the AlertDialog.Builder type:

1. Alerts are easy to create using the AlertDialog.Builder type:

   using (var dialog = new AlertDialog.Builder(this)) {
     dialog.SetTitle("Alert Title");
     dialog.SetMessage("Alert message text here...");
     dialog.Show();
   }

2. We can also add buttons to the alert by using the SetPositiveButton(), SetNegativeButton(), or SetNeutralButton() methods:

   dialog.SetPositiveButton("Yes", delegate {
     // do something cool here
   });
   dialog.SetNegativeButton("No", delegate {
     // do something uncool here
   });

3. Custom views can also be used with alerts through the SetView() method:

   var layout = LayoutInflater.Inflate(
     Resource.Layout.DialogLayout, null);
   dialog.SetView(layout);

How it works...

An alert dialog is a pop-up window that...