Displaying a message box with AlertDialog

In Chapter 4, Menus, we created a theme to make an Activity look like a dialog. In this recipe, we'll demonstrate how to create a dialog using the AlertDialog class. AlertDialog offers a Title, up to three buttons, and a list or custom layout area, as shown in the following example:

Note

The button arrangement can vary depending on the OS version.

Getting ready

Create a new project in Android Studio and call it AlertDialog. Use the default Phone & Tablet options and select the Empty Activity option when prompted for the Activity Type.

How to do it...

To demonstrate, we'll create a Confirm Delete dialog to prompt the user for confirmation after pressing the Delete button. Start by opening the main_activity.xml layout file and follow these steps:

1. Add the following <Button>:

<Button
android:id="@+id/buttonDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete"
android:onClick="confirmDelete...