Android Alert Dialog with one, two, and three buttons

I don't make alerts very often but every time I do it takes me a while to read through the documentation and figure out how to do it. Since I have had to do this a few times now, I am going to write an answer below that I can come back to in the future. Specifically I want to compare the basic code for

• One button (OK)


• Two buttons (OK and Cancel)


• Three buttons (Positive, Negative, Other)

It would be nice to have the basic code for these three common alert types in one spot for easy reference and modification in the future. This question asks how to do it for one button.

I am adding my answer below.

Answer

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();
    }
}

public class MainActivity extends AppCompatActivity {

    public void showAlertDialogButtonClicked(View view) {

        // setup the alert builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("AlertDialog");
        builder.setMessage("Would you like to continue learning how to use Android alerts?");


        // add the buttons
        builder.setPositiveButton("Continue", null);
        builder.setNegativeButton("Cancel", null);

        // create and show the alert dialog
        AlertDialog dialog = builder.create();
        dialog.show();
    }
}

public class MainActivity extends AppCompatActivity {

    public void showAlertDialogButtonClicked(View view) {


        // setup the alert builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Notice");
        builder.setMessage("Launching this missile will destroy the entire universe. Is this what you intended to do?");

        // add the buttons
        builder.setPositiveButton("Launch missile", null);
        builder.setNeutralButton("Remind me later", null);
        builder.setNegativeButton("Cancel", null);


        // create and show the alert dialog
        AlertDialog dialog = builder.create();
        dialog.show();
    }
}

If the button text it too long to all fit horizontally, then it will automatically get laid out in a vertical column of three buttons.

The OnClickListener was null in the above examples. You can replace null with a listener to do something when the user taps a button. For example:

builder.setPositiveButton("Launch missile", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        // do something like...

        launchMissile();
    }
});

There are many more varieties of dialogs that you can make. See the documentation for help with this.

Since only three buttons are supported in an AlertDialog, here is an example of a dialog with a list.

public class MainActivity extends AppCompatActivity {

    public void showAlertDialogButtonClicked(View view) {

        // setup the alert builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Choose an animal");


        // add a list
        String[] animals = {"horse", "cow", "camel", "sheep", "goat"};
        builder.setItems(animals, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which) {
                    case 0: // horse
                    case 1: // cow
                    case 2: // camel

                    case 3: // sheep
                    case 4: // goat
                }
            }
        });

        // create and show the alert dialog
        AlertDialog dialog = builder.create();
        dialog.show();
    }

}

See this answer for similar examples of a radio button list and a checkbox list.

• Use string resources rather than hard coded strings.


• You can wrap everything in a class that extends DialogFragment for easy reuse of a dialog. (See this for help.)




• These examples used the support library to support versions prior to API 11. So the import should be

  
  
  

  import android.support.v7.app.AlertDialog;
  




• I omitted the onCreate method in the examples above for brevity. There was nothing special there.