Sample code for a blog post about the Android Wear Developer Preview.

WearableActivity.java

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.preview.support.wearable.notifications.WearableNotifications;
import android.support.v4.app.NotificationCompat;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;

import com.google.common.collect.Lists;
import com.inch.android.sandbox.R;

import java.util.List;

public class WearableActivity extends BaseActivity {

    private static final int NOTIFICATION_ID = 255;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final FrameLayout root = new FrameLayout(this);
        setContentView(root);

        final Button button = new Button(this);
        button.setText("Notify!");
        button.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER));
        button.setTextSize(40);
        button.setGravity(Gravity.CENTER_HORIZONTAL);
        button.setPadding(100, 20, 100, 20);
        root.addView(button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                final List<Card> fakeCards = Card.getFakeCards();
                final List<Notification> notifications = Lists.newArrayList();

                final NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(WearableActivity.this)
                    .setSmallIcon(R.drawable.inch_logo)
                    .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.caller_picture))
                    .setContentTitle("Incoming call")
                    .setContentText("Gyula Voros");

                for (Card fakeCard : fakeCards) {
                    final NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
                    bigTextStyle.setBigContentTitle(fakeCard.title)
                        .bigText(fakeCard.description);

                    notifications.add(new NotificationCompat.Builder(WearableActivity.this)
                            .setStyle(bigTextStyle)
                            .build()
                    );
                }

                Notification twoPageNotification =
                    new WearableNotifications.Builder(notificationBuilder)
                        .addPages(notifications)
                        .build();

                ((NotificationManager) WearableActivity.this.getSystemService(Context.NOTIFICATION_SERVICE)).notify(NOTIFICATION_ID, twoPageNotification);
            }
        });
    }

    public static final class Card {

        public String title;
        public String description;

        public Card(String title, String description) {
            this.title = title;
            this.description = description;
        }

        public static List<Card> getFakeCards() {
            final List<Card> fakeCards = Lists.newArrayList();

            fakeCards.add(new Card("Re: What about the email cards?", "Today at 4:20 PM You could easily show multiple cards, just create a multi-page notification."));
            fakeCards.add(new Card("Meeting at CMI", "Yesterday at 10:00 AM\n Weekly kickoff meeting."));
            fakeCards.add(new Card("Message", "Yesterday at 9:32 AM\n I'll be late."));
            fakeCards.add(new Card("Missed call", "Yesterday at 9:30 AM"));

            return fakeCards;
        }
    }

}