android TV-Recommending TV Content,

>Helping Users Find Your Content on TV

 TV devices offer many entertainment options for users. They have thousands of content options from apps and related content services. At the same time, most users prefer to use TVs with the least amount of input possible. With the number of choices available to users, it is important for app developers to provide quick and easy paths for users to discover and enjoy your content.

> Recommending TV Content,

 When interacting with TVs, users generally prefer to give minimal input before watching content. An ideal scenario for many TV users is: sit down, turn on, and watch. The fewest steps to get users to content they enjoy is generally the path they prefer.

 The Android framework assists with minimum-input interaction by providing a recommendations row on the home screen. Content recommendations appear as the first row of the TV home screen after the first use of the device. Contributing recommendations from your app's content catalog can help bring users back to your app.

>  Recommendations help users quickly find the content and apps they enjoy. Creating recommendations that are high-quality and relevant to users is an important factor in creating a great user experience with your TV app. For this reason, you should carefully consider what recommendations you present to the user and manage them closely.

 When you create recommendations, you should link users back to incomplete viewing activities or suggest activities that extend that to related content. Here are some specific type of recommendations you should consider:

• Continuation content recommendations for the next episode for users to resume watching a series.
• New content recommendations, such as for a new first-run episode, if the user finished watching another series.
• Related content recommendations based on the users historic viewing behavior.

> Refreshing Recommendations

When refreshing recommendations, don't just remove and repost them, because doing so causes the recommendations to appear at the end of the recommendations row. Once a content item, such as a movie, has been played, remove it from the recommendations.

Customizing Recommendations

You can customize recommendation cards to convey branding information, by setting user interface elements such as the card's foreground and background image, color, app icon, title, and subtitle. To learn more, seeRecommendation Row in the Android TV Design Spec.

Create a Recommendations Service

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Content recommendations are created with background processing. In order for your application to contribute to recommendations, create a service that periodically adds listings from your app's catalog to the system's list of recommendations.

>to extend IntentService to create a recommendation service for your application:

public class UpdateRecommendationsService extends IntentService {
    private static final String TAG = "UpdateRecommendationsService";
    private static final int MAX_RECOMMENDATIONS = 3;

    public UpdateRecommendationsService() {
        super("RecommendationService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.d(TAG, "Updating recommendation cards");
        HashMap<String, List<Movie>> recommendations = VideoProvider.getMovieList();
        if (recommendations == null) return;

        int count = 0;

        try {
            RecommendationBuilder builder = new RecommendationBuilder()
                    .setContext(getApplicationContext())
                    .setSmallIcon(R.drawable.videos_by_google_icon);

            for (Map.Entry<String, List<Movie>> entry : recommendations.entrySet()) {
                for (Movie movie : entry.getValue()) {
                    Log.d(TAG, "Recommendation - " + movie.getTitle());

                    builder.setBackground(movie.getCardImageUrl())
                            .setId(count + 1)
                            .setPriority(MAX_RECOMMENDATIONS - count)
                            .setTitle(movie.getTitle())
                            .setDescription(getString(R.string.popular_header))
                            .setImage(movie.getCardImageUrl())
                            .setIntent(buildPendingIntent(movie))
                            .build();

                    if (++count >= MAX_RECOMMENDATIONS) {
                        break;
                    }
                }
                if (++count >= MAX_RECOMMENDATIONS) {
                    break;
                }
            }
        } catch (IOException e) {
            Log.e(TAG, "Unable to update recommendation", e);
        }
    }

    private PendingIntent buildPendingIntent(Movie movie) {
        Intent detailsIntent = new Intent(this, DetailsActivity.class);
        detailsIntent.putExtra("Movie", movie);

        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(DetailsActivity.class);
        stackBuilder.addNextIntent(detailsIntent);
        // Ensure a unique PendingIntents, otherwise all
        // recommendations end up with the same PendingIntent
        detailsIntent.setAction(Long.toString(movie.getId()));

        PendingIntent intent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
        return intent;
    }
}

>First, you set the values of the recommendation card elements.

public class RecommendationBuilder {
    ...

    public RecommendationBuilder setTitle(String title) {
            mTitle = title;
            return this;
        }

        public RecommendationBuilder setDescription(String description) {
            mDescription = description;
            return this;
        }

        public RecommendationBuilder setImage(String uri) {
            mImageUri = uri;
            return this;
        }

        public RecommendationBuilder setBackground(String uri) {
            mBackgroundUri = uri;
            return this;
        }

> Once you've set the values, you then build the notification, assigning the values from the builder class to the notification, and calling NotificationCompat.Builder.build().

Also, be sure to call setLocalOnly() so the NotificationCompat.BigPictureStyle notification won't show up on other devices.

public class RecommendationBuilder {
    ...

    public Notification build() throws IOException {
        ...

        Notification notification = new NotificationCompat.BigPictureStyle(
                new NotificationCompat.Builder(mContext)
                        .setContentTitle(mTitle)
                        .setContentText(mDescription)
                        .setPriority(mPriority)
                        .setLocalOnly(true)
                        .setOngoing(true)
                        .setColor(mContext.getResources().getColor(R.color.fastlane_background))
                        .setCategory(Notification.CATEGORY_RECOMMENDATION)
                        .setLargeIcon(image)
                        .setSmallIcon(mSmallIcon)
                        .setContentIntent(mIntent)
                        .setExtras(extras))
                .build();

        return notification;
    }
}

>  extends the BroadcastReceiver class to start periodic execution of a recommendation service every half hour:

public class BootupActivity extends BroadcastReceiver {
    private static final String TAG = "BootupActivity";

    private static final long INITIAL_DELAY = 5000;

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "BootupActivity initiated");
        if (intent.getAction().endsWith(Intent.ACTION_BOOT_COMPLETED)) {
            scheduleRecommendationUpdate(context);
        }
    }

    private void scheduleRecommendationUpdate(Context context) {
        Log.d(TAG, "Scheduling recommendations update");

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent recommendationIntent = new Intent(context, UpdateRecommendationsService.class);
        PendingIntent alarmIntent = PendingIntent.getService(context, 0, recommendationIntent, 0);

        alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                INITIAL_DELAY,
                AlarmManager.INTERVAL_HALF_HOUR,
                alarmIntent);
    }

This implementation of the BroadcastReceiver class must run after start up of the TV device where it is installed. To accomplish this, register this class in your app manifest with an intent filter that listens for the completion of the device boot process. The following sample code demonstrates how to add this configuration to the manifest:

<manifest ... >
  <application ... >
    <receiver android:name="com.example.android.tvleanback.BootupActivity"
              android:enabled="true"
              android:exported="false">
      <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"/>
      </intent-filter>
    </receiver>
  </application>
</manifest>

Important: Receiving a boot completed notification requires that your app requests theRECEIVE_BOOT_COMPLETED permission. For more information, see ACTION_BOOT_COMPLETED.

In your recommendation service class' onHandleIntent() method, post the recommendation to the manager as follows:

Notification notification = notificationBuilder.build();
mNotificationManager.notify(id, notification);