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class StartGameDialogFragment : DialogFragment() {
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        return activity?.let {
            // Use the Builder class for convenient dialog construction.
            val builder = AlertDialog.Builder(it)
            builder.setMessage("Start game")
                .setPositiveButton("Start") { dialog, id ->
                    // START THE GAME!
                }
                .setNegativeButton("Cancel") { dialog, id ->
                    // User cancelled the dialog.
                }
            // Create the AlertDialog object and return it.
            builder.create()
        } ?: throw IllegalStateException("Activity cannot be null")
    }
}

class OldXmlActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_old_xml)

        StartGameDialogFragment().show(supportFragmentManager, "GAME_DIALOG")
    }
}

public class StartGameDialogFragment extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction.
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(R.string.dialog_start_game)
               .setPositiveButton(R.string.start, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // START THE GAME!
                   }
               })
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // User cancels the dialog.
                   }
               });
        // Create the AlertDialog object and return it.
        return builder.create();
    }
}
// ...

StartGameDialogFragment().show(supportFragmentManager, "GAME_DIALOG");

val builder: AlertDialog.Builder = AlertDialog.Builder(context)
builder
    .setMessage("I am the message")
    .setTitle("I am the title")

val dialog: AlertDialog = builder.create()
dialog.show()

// 1. Instantiate an AlertDialog.Builder with its constructor.
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

// 2. Chain together various setter methods to set the dialog characteristics.
builder.setMessage(R.string.dialog_message)
       .setTitle(R.string.dialog_title);

// 3. Get the AlertDialog.
AlertDialog dialog = builder.create();

val builder: AlertDialog.Builder = AlertDialog.Builder(context)
builder
    .setMessage("I am the message")
    .setTitle("I am the title")
    .setPositiveButton("Positive") { dialog, which ->
        // Do something.
    }
    .setNegativeButton("Negative") { dialog, which ->
        // Do something else.
    }

val dialog: AlertDialog = builder.create()
dialog.show()

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Add the buttons.
builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // User taps OK button.
           }
       });
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // User cancels the dialog.
           }
       });
// Set other dialog properties.
...

// Create the AlertDialog.
AlertDialog dialog = builder.create();

val builder: AlertDialog.Builder = AlertDialog.Builder(context)
builder
    .setTitle("I am the title")
    .setPositiveButton("Positive") { dialog, which ->
        // Do something.
    }
    .setNegativeButton("Negative") { dialog, which ->
        // Do something else.
    }
    .setItems(arrayOf("Item One", "Item Two", "Item Three")) { dialog, which ->
        // Do something on item tapped.
    }

val dialog: AlertDialog = builder.create()
dialog.show()

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle(R.string.pick_color)
           .setItems(R.array.colors_array, new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
               // The 'which' argument contains the index position of the selected item.
           }
    });
    return builder.create();
}

val builder: AlertDialog.Builder = AlertDialog.Builder(context)
builder
    .setTitle("I am the title")
    .setPositiveButton("Positive") { dialog, which ->
        // Do something.
    }
    .setNegativeButton("Negative") { dialog, which ->
        // Do something else.
    }
    .setMultiChoiceItems(
        arrayOf("Item One", "Item Two", "Item Three"), null) { dialog, which, isChecked ->
        // Do something.
    }

val dialog: AlertDialog = builder.create()
dialog.show()

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    selectedItems = new ArrayList();  // Where we track the selected items
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    // Set the dialog title.
    builder.setTitle(R.string.pick_toppings)
    // Specify the list array, the items to be selected by default (null for
    // none), and the listener through which to receive callbacks when items
    // are selected.
           .setMultiChoiceItems(R.array.toppings, null,
                      new DialogInterface.OnMultiChoiceClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which,
                       boolean isChecked) {
                   if (isChecked) {
                       // If the user checks the item, add it to the selected
                       // items.
                       selectedItems.add(which);
                   } else if (selectedItems.contains(which)) {
                       // If the item is already in the array, remove it.
                       selectedItems.remove(which);
                   }
               }
           })
    // Set the action buttons
           .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int id) {
                   // User taps OK, so save the selectedItems results
                   // somewhere or return them to the component that opens the
                   // dialog.
                   ...
               }
           })
           .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int id) {
                   ...
               }
           });

    return builder.create();
}

val builder: AlertDialog.Builder = AlertDialog.Builder(context)
builder
    .setTitle("I am the title")
    .setPositiveButton("Positive") { dialog, which ->
        // Do something.
    }
    .setNegativeButton("Negative") { dialog, which ->
        // Do something else.
    }
    .setSingleChoiceItems(
        arrayOf("Item One", "Item Two", "Item Three"), 0
    ) { dialog, which ->
        // Do something.
    }

val dialog: AlertDialog = builder.create()
dialog.show()

        String[] choices = {"Item One", "Item Two", "Item Three"};
        
        AlertDialog.Builder builder = AlertDialog.Builder(context);
        builder
                .setTitle("I am the title")
                .setPositiveButton("Positive", (dialog, which) -> {

                })
                .setNegativeButton("Negative", (dialog, which) -> {

                })
                .setSingleChoiceItems(choices, 0, (dialog, which) -> {

                });

        AlertDialog dialog = builder.create();
        dialog.show();

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return activity?.let {
        val builder = AlertDialog.Builder(it)
        // Get the layout inflater.
        val inflater = requireActivity().layoutInflater;

        // Inflate and set the layout for the dialog.
        // Pass null as the parent view because it's going in the dialog
        // layout.
        builder.setView(inflater.inflate(R.layout.dialog_signin, null))
                // Add action buttons.
                .setPositiveButton(R.string.signin,
                        DialogInterface.OnClickListener { dialog, id ->
                            // Sign in the user.
                        })
                .setNegativeButton(R.string.cancel,
                        DialogInterface.OnClickListener { dialog, id ->
                            getDialog().cancel()
                        })
        builder.create()
    } ?: throw IllegalStateException("Activity cannot be null")
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    // Get the layout inflater.
    LayoutInflater inflater = requireActivity().getLayoutInflater();

    // Inflate and set the layout for the dialog.
    // Pass null as the parent view because it's going in the dialog layout.
    builder.setView(inflater.inflate(R.layout.dialog_signin, null))
    // Add action buttons
           .setPositiveButton(R.string.signin, new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int id) {
                   // Sign in the user.
               }
           })
           .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   LoginDialogFragment.this.getDialog().cancel();
               }
           });
    return builder.create();
}

class NoticeDialogFragment : DialogFragment() {
    // Use this instance of the interface to deliver action events.
    internal lateinit var listener: NoticeDialogListener

    // The activity that creates an instance of this dialog fragment must
    // implement this interface to receive event callbacks. Each method passes
    // the DialogFragment in case the host needs to query it.
    interface NoticeDialogListener {
        fun onDialogPositiveClick(dialog: DialogFragment)
        fun onDialogNegativeClick(dialog: DialogFragment)
    }

    // Override the Fragment.onAttach() method to instantiate the
    // NoticeDialogListener.
    override fun onAttach(context: Context) {
        super.onAttach(context)
        // Verify that the host activity implements the callback interface.
        try {
            // Instantiate the NoticeDialogListener so you can send events to
            // the host.
            listener = context as NoticeDialogListener
        } catch (e: ClassCastException) {
            // The activity doesn't implement the interface. Throw exception.
            throw ClassCastException((context.toString() +
                    " must implement NoticeDialogListener"))
        }
    }
}

public class NoticeDialogFragment extends DialogFragment {

    // The activity that creates an instance of this dialog fragment must
    // implement this interface to receive event callbacks. Each method passes
    // the DialogFragment in case the host needs to query it.
    public interface NoticeDialogListener {
        public void onDialogPositiveClick(DialogFragment dialog);
        public void onDialogNegativeClick(DialogFragment dialog);
    }

    // Use this instance of the interface to deliver action events.
    NoticeDialogListener listener;

    // Override the Fragment.onAttach() method to instantiate the
    // NoticeDialogListener.
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        // Verify that the host activity implements the callback interface.
        try {
            // Instantiate the NoticeDialogListener so you can send events to
            // the host.
            listener = (NoticeDialogListener) context;
        } catch (ClassCastException e) {
            // The activity doesn't implement the interface. Throw exception.
            throw new ClassCastException(activity.toString()
                    + " must implement NoticeDialogListener");
        }
    }
    ...
}

class MainActivity : FragmentActivity(),
        NoticeDialogFragment.NoticeDialogListener {

    fun showNoticeDialog() {
        // Create an instance of the dialog fragment and show it.
        val dialog = NoticeDialogFragment()
        dialog.show(supportFragmentManager, "NoticeDialogFragment")
    }

    // The dialog fragment receives a reference to this Activity through the
    // Fragment.onAttach() callback, which it uses to call the following
    // methods defined by the NoticeDialogFragment.NoticeDialogListener
    // interface.
    override fun onDialogPositiveClick(dialog: DialogFragment) {
        // User taps the dialog's positive button.
    }

    override fun onDialogNegativeClick(dialog: DialogFragment) {
        // User taps the dialog's negative button.
    }
}

public class MainActivity extends FragmentActivity
                          implements NoticeDialogFragment.NoticeDialogListener{
    ...
    public void showNoticeDialog() {
        // Create an instance of the dialog fragment and show it.
        DialogFragment dialog = new NoticeDialogFragment();
        dialog.show(getSupportFragmentManager(), "NoticeDialogFragment");
    }

    // The dialog fragment receives a reference to this Activity through the
    // Fragment.onAttach() callback, which it uses to call the following
    // methods defined by the NoticeDialogFragment.NoticeDialogListener
    // interface.
    @Override
    public void onDialogPositiveClick(DialogFragment dialog) {
        // User taps the dialog's positive button.
        ...
    }

    @Override
    public void onDialogNegativeClick(DialogFragment dialog) {
        // User taps the dialog's negative button.
        ...
    }
}

    override fun onCreateDialog(savedInstanceState: Bundle): Dialog {
        return activity?.let {
            // Build the dialog and set up the button click handlers.
            val builder = AlertDialog.Builder(it)

            builder.setMessage(R.string.dialog_start_game)
                    .setPositiveButton(R.string.start,
                            DialogInterface.OnClickListener { dialog, id ->
                                // Send the positive button event back to the
                                // host activity.
                                listener.onDialogPositiveClick(this)
                            })
                    .setNegativeButton(R.string.cancel,
                            DialogInterface.OnClickListener { dialog, id ->
                                // Send the negative button event back to the
                                // host activity.
                                listener.onDialogNegativeClick(this)
                            })

            builder.create()
        } ?: throw IllegalStateException("Activity cannot be null")
    }

public class NoticeDialogFragment extends DialogFragment {
    ...
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Build the dialog and set up the button click handlers.
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(R.string.dialog_start_game)
               .setPositiveButton(R.string.start, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // Send the positive button event back to the host activity.
                       listener.onDialogPositiveClick(NoticeDialogFragment.this);
                   }
               })
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // Send the negative button event back to the host activity.
                       listener.onDialogNegativeClick(NoticeDialogFragment.this);
                   }
               });
        return builder.create();
    }
}

fun confirmStartGame() {
    val newFragment = StartGameDialogFragment()
    newFragment.show(supportFragmentManager, "game")
}

public void confirmStartGame() {
    DialogFragment newFragment = new StartGameDialogFragment();
    newFragment.show(getSupportFragmentManager(), "game");
}

class CustomDialogFragment : DialogFragment() {

    // The system calls this to get the DialogFragment's layout, regardless of
    // whether it's being displayed as a dialog or an embedded fragment.
    override fun onCreateView(
            inflater: LayoutInflater,
            container: ViewGroup?,
            savedInstanceState: Bundle?
    ): View {
        // Inflate the layout to use as a dialog or embedded fragment.
        return inflater.inflate(R.layout.purchase_items, container, false)
    }

    // The system calls this only when creating the layout in a dialog.
    override fun onCreateDialog(savedInstanceState: Bundle): Dialog {
        // The only reason you might override this method when using
        // onCreateView() is to modify the dialog characteristics. For example,
        // the dialog includes a title by default, but your custom layout might
        // not need it. Here, you can remove the dialog title, but you must
        // call the superclass to get the Dialog.
        val dialog = super.onCreateDialog(savedInstanceState)
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
        return dialog
    }
}

public class CustomDialogFragment extends DialogFragment {
    // The system calls this to get the DialogFragment's layout, regardless of
    // whether it's being displayed as a dialog or an embedded fragment.
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // Inflate the layout to use as a dialog or embedded fragment.
        return inflater.inflate(R.layout.purchase_items, container, false);
    }

    // The system calls this only when creating the layout in a dialog.
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // The only reason you might override this method when using
        // onCreateView() is to modify the dialog characteristics. For example,
        // the dialog includes a title by default, but your custom layout might
        // not need it. Here, you can remove the dialog title, but you must
        // call the superclass to get the Dialog.
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }
}

fun showDialog() {
    val fragmentManager = supportFragmentManager
    val newFragment = CustomDialogFragment()
    if (isLargeLayout) {
        // The device is using a large layout, so show the fragment as a
        // dialog.
        newFragment.show(fragmentManager, "dialog")
    } else {
        // The device is smaller, so show the fragment fullscreen.
        val transaction = fragmentManager.beginTransaction()
        // For a polished look, specify a transition animation.
        transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
        // To make it fullscreen, use the 'content' root view as the container
        // for the fragment, which is always the root view for the activity.
        transaction
                .add(android.R.id.content, newFragment)
                .addToBackStack(null)
                .commit()
    }
}

public void showDialog() {
    FragmentManager fragmentManager = getSupportFragmentManager();
    CustomDialogFragment newFragment = new CustomDialogFragment();

    if (isLargeLayout) {
        // The device is using a large layout, so show the fragment as a
        // dialog.
        newFragment.show(fragmentManager, "dialog");
    } else {
        // The device is smaller, so show the fragment fullscreen.
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        // For a polished look, specify a transition animation.
        transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        // To make it fullscreen, use the 'content' root view as the container
        // for the fragment, which is always the root view for the activity.
        transaction.add(android.R.id.content, newFragment)
                   .addToBackStack(null).commit();
    }
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    isLargeLayout = resources.getBoolean(R.bool.large_layout)
}

boolean isLargeLayout;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    isLargeLayout = getResources().getBoolean(R.bool.large_layout);
}