Android10 如何显示每日离线通知?

How to show daily offline notifications in Android 10?

我想向用户发送离线通知 daily.Tried 许多事情,例如:警报管理器、工作管理器,但没有 luck.The 通知未触发或它们只是稍后触发。

有什么方法可以完成工作吗?

报警功能:

public void StartAlarm()
{
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY,23);
    calendar.set(Calendar.MINUTE,59);
    calendar.set(Calendar.SECOND,0);


    AlarmManager alarmManager = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);


    Intent alarmIntent = new Intent(getApplicationContext(), AlarmReceiver.class);
    //alarmIntent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);

    Log.d("LOG", String.valueOf(calendar.getTimeInMillis()));

    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 156, alarmIntent, 0);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        } else {
            alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        }

工作经理代码:

 public MyWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
}


@NonNull
@Override
public Result doWork() {


    StartAlarm();


    Log.d("In worker","yes");


    return Result.success();
}

工作经理driver:

public void StartPeriodicWorker()
{

    final PeriodicWorkRequest periodicWorkRequest = new
            PeriodicWorkRequest.Builder(MyWorker.class,24,TimeUnit.HOURS)
            .addTag("Birthday")
            .build();

    WorkManager.getInstance(getApplicationContext()).enqueueUniquePeriodicWork("Birthday Notifier", ExistingPeriodicWorkPolicy.REPLACE, periodicWorkRequest);

}

报警接收器:

  public class AlarmReceiver extends BroadcastReceiver {

private DatabaseReference myRef;
private ArrayList<String> allPeoples;

private int numberOfPeoples;

private Context ctx;

@Override
public void onReceive(Context context, Intent intent) {

    Toast.makeText(context,"In alarm receiver",Toast.LENGTH_LONG).show();

    ctx = context;
    initPeoples();

}

public String getCurrentDate() {
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat mdformat = new SimpleDateFormat("d MMMM");
    String strDate = mdformat.format(calendar.getTime());
    return strDate;
}


private  void initPeoples() {

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    myRef = database.getReference("Users");
    myRef.keepSynced(true);

    myRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            allPeoples =  new ArrayList<>();
            for(DataSnapshot snapshot : dataSnapshot.getChildren()){
                if(snapshot.getKey().equals("Teacher") || snapshot.getKey().equals("Staff")){
                    for(DataSnapshot faculty : snapshot.child("peoples").getChildren()){
                        String birthday = (String) faculty.child("DOB").getValue();

                        if(birthday.equals(getCurrentDate())) {
                            String member = birthday;
                            allPeoples.add(member);
                        }
                    }
                }else{
                    for(DataSnapshot student : snapshot.child("peoples").getChildren()){
                        String birthday = (String) student.child("DOB").getValue();

                        if(birthday.equals(getCurrentDate())) {
                            String member = birthday;
                            allPeoples.add(member);
                        }
                    }
                }
            }

            numberOfPeoples = allPeoples.size();

            ShowNotification();

        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });

}

public void ShowNotification()
{
    String CHANNEL_ID = "Channel_1453";
    String CHANNEL_NAME = "Birthday Notification";

    NotificationManagerCompat manager = NotificationManagerCompat.from(ctx);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME,
                NotificationManager.IMPORTANCE_HIGH);
        manager.createNotificationChannel(channel);
    }

    Notification notification = new NotificationCompat.Builder(ctx, CHANNEL_ID)
            .setSmallIcon(R.drawable.ic_stat_notify)
            .setContentTitle("Birthday Reminder")
            .setColor(Color.GREEN)
            .setContentText("Click to see who has birthday today!")
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setAutoCancel(true)
            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
            .setContentIntent(PendingIntent.getActivity(ctx, 0, new Intent(ctx, Birthday.class), PendingIntent.FLAG_UPDATE_CURRENT))
            .build();

    manager.notify(454, notification);
}

}

看起来你做的一切都是对的,正如你在评论中所说的它在 nexus S 上工作,我假设你也在清单中声明了接收者。

所以在遇到同样的问题一周后,结果是:

在某些自定义 OS 的设备(如小米)中,当您将应用从最近使用的列表中滑开时,OS 将其视为强制停止,因此所有服务和其他内容都会被杀。基于 Issue Tracker 目前没有办法解决这个问题。他们回应说他们正在与原始设备制造商合作解决这个问题。

但根据我自己的经验,如果您使用工作管理器设置通知,它会延迟,但您最终会收到(至少大部分时间)。

但是如果你想要准确的时间,暂时没有办法进行。

目前唯一的解决办法是手动授予一些权限。有关此手动设置的更多信息,请访问 dontkillmyapp

我可以看到一个可能的问题,并且可以在没有 workmanager 的情况下执行此操作(假设设备在通知运行时连接正常)。

我建议启动一项服务(如果高于 Android 8.0,则为前台服务),而不是在接收器本身中建立网络,然后在那里开展工作。这是因为 android 的接收者时间限制比 service/foreground 服务短得多。所以对我来说,您的接收器在网络请求完成之前被杀死听起来很合理,因此没有显示任何通知。

您可以在服务中显示通知,还可以安排下一个闹钟,因为 setExactAndAllowWhileIdle 本身不是重复闹钟。所以在你的接收器中,是这样的:

@Override
public void onReceive(Context context, Intent intent) {
        Intent service = new Intent(context, BirthdayNotifyService.class);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            context.startForegroundService(service);
        } else {
            context.startService(service);
        }
}

然后一个可能的服务class:

public class BirthdayNotifyService extends IntentService {

    public BirthdayNotifyService() {
        super("BirthdayNotifyService");
    }

    @Override
    public int onStartCommand(@Nullable Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);
        return START_STICKY;
    }

    @Override
    protected void onHandleIntent(@Nullable Intent intent) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            //Build a simple notification to show if a foreground service is neccesary
            Notification noti = notiBuilder.build();
            startForeground(1, noti);
        }

        //Do your network request work here. After completed, show your birthday notification and stop the foreground service.
    }
}

要在显示生日通知后立即停止服务,请使用以下命令:

stopForeground(true);
stopSelf();

更新:我在我的 phone(小米红米 Note 8 plus)上使用了这个方法,它工作了几次,然后就停止工作了。它在库存 android 上运行良好,但并非在所有设备上运行良好。因此我仍然会说这不是在特定时间发送通知的可靠解决方案。