ViewPager viewPager = findViewById(R.id.viewPager); PagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager()); viewPager.setAdapter(adapter); private class MyPagerAdapter extends FragmentPagerAdapter { public MyPagerAdapter(FragmentManager fragmentManager) { super(fragmentManager); } @Override public Fragment getItem(int position) { return new MyFragment(); } @Override public int getCount() { return 3; } } <androidx.viewpager.widget.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent" /> NotificationCompat.Builder builder = new NotificationCompat.Builder(context) .setSmallIcon(R.drawable.notification_icon) .setPriority(NotificationCompat.PRIORITY_DEFAULT) .setAutoCancel(true); NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());