我可以使用作业调度程序发送通知吗？

Question

我正在尝试在作业服务运行时发出通知。它不工作。我想知道启用 Job 服务时提供通知的正确方法。请帮助我理解这些概念以及如何使其发挥作用？ 注意：计划正在运行，我正在尝试添加通知，但它不起作用。

public class GuardianJobService  extends JobService{
     public final int REQUEST_CODE_ASK_PERMISSIONS = 1001;
@Override
public boolean onStartJob(JobParameters params) {
    enableTracking();
    addNotification();
    return true;
}

@Override
public boolean onStopJob(JobParameters params) {
    return true;
}

private void addNotification() {
    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.alert_icon)
                    .setContentTitle("Notifications Example")
                    .setContentText("This is a test notification");
    Intent notificationIntent = new Intent(this, LoginActivity.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
}
public void enableTracking() {  
    ......
}

}

Answer 1

作业调度基本上是在后台运行长任务。您应该在 FirebaseMessagingService 中添加通知，然后在添加通知后启动作业以在后台执行任务。

Answer 2

是的，我已经实现了监听器，它计划检查事件。如果这符合我的要求，那么我只需调用下面给出的函数。

private void generateBigTextStyleNotification() {
    String notificationChannelId =
            NotificationUtil.createNotificationChannel(thisService);

    String title = "Your title";
    String msg = "Your message";

    NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle()
            .bigText(msg)
            .setBigContentTitle(title)
            .setSummaryText("Your Summary");

    PendingIntent notifyPendingIntent =
            PendingIntent.getActivity(
                    thisService,
                    0,
                    new Intent(),
                    PendingIntent.FLAG_CANCEL_CURRENT
            );

    //Build and issue the notification.

    // Notification Channel Id is ignored for Android pre O (26).
    NotificationCompat.Builder notificationCompatBuilder =
            new NotificationCompat.Builder(
                    thisService, notificationChannelId);
    notificationCompatBuilder.setAutoCancel(true);
    GlobalNotificationBuilder.setNotificationCompatBuilderInstance(notificationCompatBuilder);
    Uri alarmSound = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE
            + "://" + thisService.getPackageName() + "YourSoundPath");
    Notification notification = notificationCompatBuilder
            // BIG_TEXT_STYLE sets title and content for API 16 (4.1 and after).
            .setStyle(bigTextStyle)
            // Title for API <16 (4.0 and below) devices.
            .setContentTitle(title)
            // Content for API <24 (7.0 and below) devices.
            .setContentText(msg)
            .setSmallIcon(R.drawable.ic_launcher)
            .setSound(alarmSound)
            .setLargeIcon(BitmapFactory.decodeResource(
                    thisService.getResources(),
                    R.mipmap.ic_launcher))
            .setContentIntent(notifyPendingIntent)
            .setDefaults(NotificationCompat.FLAG_AUTO_CANCEL)
            // Set primary color (important for Wear 2.0 Notifications).
            .setColor(ContextCompat.getColor(thisService, R.color.secondary_background_color))
            .setCategory(Notification.CATEGORY_EVENT)

            // Sets priority for 25 and below. For 26 and above, 'priority' is deprecated for
            // 'importance' which is set in the NotificationChannel. The integers representing
            // 'priority' are different from 'importance', so make sure you don't mix them.
            .setPriority(NotificationCompat.PRIORITY_MAX)

            // Sets lock-screen visibility for 25 and below. For 26 and above, lock screen
            // visibility is set in the NotificationChannel.
            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
            .setAutoCancel(true)

            // Adds additional actions specified above.
            .build();
    mNotificationManagerCompat.notify(NOTIFICATION_ID, notification);
}

Bahman 感谢提问，这是我们的 NotificationUtil 类：

public class NotificationUtil {
public static String createNotificationChannel(
        Context context) {

    // NotificationChannels are required for Notifications on O (API 26) and above.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

        // The id of the channel.
        String channelId = "YOUR_CHANNEL_ID";

        // The user-visible name of the channel.
        CharSequence channelName = "YOUR_CHANNEL_NAME";
        // The user-visible description of the channel.
        String channelDescription = "YOUR_CHANNEL_DESCRIPTION";
        int channelImportance = NotificationManager.IMPORTANCE_HIGH;
        int channelLockscreenVisibility = NotificationCompat.VISIBILITY_PUBLIC;

        // Initializes NotificationChannel.
        NotificationChannel notificationChannel = null;
        notificationChannel = new NotificationChannel(channelId, channelName, channelImportance);

        notificationChannel.setDescription(channelDescription);
        notificationChannel.enableVibration(true);
        notificationChannel.setLockscreenVisibility(channelLockscreenVisibility);

        // Adds NotificationChannel to system. Attempting to create an existing notification
        // channel with its original values performs no operation, so it's safe to perform the
        // below sequence.
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);

        return channelId;
    } else {
        // Returns null for pre-O (26) devices.
        return null;
    }
}

}

Answer 3

我认为有一些潜在的问题

• 忘记在 AndroidManifest.xml 中添加 GuardianJobService
• 从未满足运行作业的条件（您能出示您的日程安排代码吗？）
• 如果您在 Android >= 8.0 的设备上运行，则需要创建通知通道以接收通知（请参阅 here）

Answer 4

请创建一个通知渠道并将其注册到您的通知管理器。构建通知时使用相同的通知渠道。如果您在 Android 版本大于或等于 Oreo 的设备上运行代码，则该应用不会触发通知，因此您需要为 Oreo 及更高版本提供通知通道。参考：https://developer.android.com/training/notify-user/build-notification