我可以使用作业计划程序发送通知吗?

Question

我正在尝试在作业服务运行时发出通知。它不起作用。我想知道启用作业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工作？注意：计划正在工作，我正在尝试添加通知，但不起作用。

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，然后在添加通知后在后台启动作业以执行任务。

Answer 2

是的，我已经实现了计划用于检查事件的侦听器。如果这符合我的要求，那么我只需调用下面给定的函数。

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);
}

巴曼 谢谢你的提问，这是我们的通知实用程序类：

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

我认为存在一些潜在的问题

• 忘了在 AndroidManifest 中添加 GuardianJobService.xml
• 永远不要满足运行作业的条件(你能显示你的计划代码吗？
• 如果您在装有Android>= 8.0的设备上运行，则需要创建通知通道才能接收通知(请参阅此处(

Answer 4

请创建一个通知通道并将其注册到您的通知管理器。生成通知时使用相同的通知通道。如果您在Android版本高于或等于奥利奥的设备上运行代码，该应用程序不会触发通知，因此您需要为奥利奥及更高版本设置通知通道。参考： https://developer.android.com/training/notify-user/build-notification