Making an AlertDialog in Android

This is an expansion of an answer I wrote on Stack Overflow.

AlertDialogs are useful for displaying a message to a user and optionally giving them a chance to respond to it. This is the equivalent of an iOS UIAlertController (or a Flutter AlertDialog). The examples below show a basic setup for one, two, and three buttons.

One button

import android.support.v7.app.AlertDialog;
public class MainActivity extends AppCompatActivity {
    public void showAlertDialogButtonClicked(View view) {
        // setup the alert builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("My title");
        builder.setMessage("This is my message.");
        // add a button
        builder.setPositiveButton("OK", null);
        // create and show the alert dialog
        AlertDialog dialog = builder.create();
        dialog.show();
    }
}

Two buttons

public class MainActivity extends AppCompatActivity {
    public void…