NotificationFactory

RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY).build();

NotificationCompat.Action action =
        new NotificationCompat.Action.Builder(...)
                .addRemoteInput(remoteInput)
                .build();

NotificationCompat.WearableExtender wearableExtender = new NotificationCompat.WearableExtender().addAction(action);

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(MainActivity.this).extend(wearableExtender);