Simplest yes/no dialog fragment

So, what's the simplest way to create and display a really basic Alert Dialog? Bonus points if it's using the support library.

Simply create a DialogFragment(SDK or support library) and override its onCreateDialog method to return an AlertDialog with the desired text and buttons set on it:

public static class SimpleDialog extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
                .setMessage("Are you sure?")
                .setPositiveButton("Ok", null)
                .setNegativeButton("No way", null)
                .create();
    }

}

To do something when the user uses one of the buttons you'll have to provide an instance of a DialogInterface.OnClickListener instead of the null references from my code.

A DialogFragment is really just a fragment that wraps a dialog. You can put any kind of dialog in there by creating and returning the dialog in the onCreateDialog() method of the DialogFragment.

Heres an example DialogFragment:

class MyDialogFragment extends DialogFragment{
    Context mContext;
    public MyDialogFragment() {
        mContext = getActivity();
    }
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
        alertDialogBuilder.setTitle("Really?");
        alertDialogBuilder.setMessage("Are you sure?");
        //null should be your on click listener
        alertDialogBuilder.setPositiveButton("OK", null);
        alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });


        return alertDialogBuilder.create();
    }
}

To create the dialog call:

new MyDialogFragment().show(getFragmentManager(), "MyDialog");

And to dismiss the dialog from somewhere:

((MyDialogFragment)getFragmentManager().findFragmentByTag("MyDialog")).getDialog().dismiss();

All of that code will work perfectly with the support library, by just changing the imports to use the support library classes.

For those coding with Kotlin and Anko, you can now do dialogs in 4 lines of code:

alert("Order", "Do you want to order this item?") {
    positiveButton("Yes") { processAnOrder() }
    negativeButton("No") { }
}.show()