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;
    }
}

使服務(wù)被系統(tǒng)意識和運行，在應(yīng)用manifest中注冊它，接下來的代碼片段展示了如何定義這個類做為服務(wù)：

<manifest ... >
  <application ... >
    ...

    <service
            android:name="com.example.android.tvleanback.UpdateRecommendationsService"
            android:enabled="true" />
  </application>
</manifest>

刷新推薦

基于用戶的行為和數(shù)據(jù)來推薦，例如播放列表，喜愛列表和相關(guān)內(nèi)容。當(dāng)刷新推薦時，不僅僅是刪除和重新加載他們，因為這樣會導(dǎo)致推薦出現(xiàn)在推薦欄的結(jié)尾。一旦一個內(nèi)容項被播放，如一個影片，從推薦中刪除它。

應(yīng)用的推薦順序被保存依據(jù)應(yīng)用提供他們的順序。framework interleave應(yīng)用推薦基于推薦質(zhì)量，用戶習(xí)慣的收集。最好的推薦應(yīng)是推薦最合適的出現(xiàn)在列表前面。

創(chuàng)建推薦

一旦我們的推薦服務(wù)開始運行，它必須創(chuàng)建推薦和推送他們到Android framework。Framework收到推薦作為通知對象。它用特定的模板并且標(biāo)記為特定的目錄。

設(shè)置值

去設(shè)置推薦卡片的UI元素，創(chuàng)建一個builder類用接下來的builder樣式描述。首先，設(shè)置推薦卡片元素的值。

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;
        }
...

創(chuàng)建通知

一旦我們設(shè)置了值，然后去創(chuàng)建通知，從builder類分配值到通知，并且調(diào)用[NotificationCompat.Builder.build](http://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#build())。

并且，確信調(diào)用setLocalOnly()，這樣NotificationCompat.BigPictureStyle通知不將顯示在另一個設(shè)備。

接下來的代碼示例展示了如何創(chuàng)建推薦。

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;
    }
}

運行推薦服務(wù)

我們的應(yīng)用推薦服務(wù)必須周期性運行確保創(chuàng)建當(dāng)前的推薦。去運行我們的服務(wù)，創(chuàng)建一個類運行計時器和在周期間隔關(guān)聯(lián)它。接下來的代碼例子擴展了BroadcastReceiver類去開始每半小時的推薦服務(wù)的周期性執(zhí)行：

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);
    }
}

這個BroadcastReceiver類的實現(xiàn)必須運行在TV設(shè)備啟動后。為了完成這個，注冊這個類在應(yīng)用manifest的intet filter中，它監(jiān)聽設(shè)備啟動完成。接下來的代碼展示了如何添加這個配置到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：接收一個啟動完成通知需要我們的應(yīng)用有RECEIVE_BOOT_COMPLETED權(quán)限。更多信息，查看ACTION_BOOT_COMPLETED。

在推薦服務(wù)類的onHandleIntent()方法中，用以下代碼提交推薦到管理器：

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

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推薦TV內(nèi)容

創(chuàng)建推薦服務(wù)

刷新推薦

創(chuàng)建推薦

設(shè)置值

創(chuàng)建通知

運行推薦服務(wù)