android - 如何在 Android 10 中显示每日离线通知？

Question

我想每天向用户发送离线通知。尝试了很多事情，例如:警报管理器，工作管理器，但没有运气。通知没有触发或者它们只是稍后触发。
有什么办法可以完成工作吗？
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();
}

工作经理司机:

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);
}

}

Answer 1

我可以看到一个可能的问题，并且可以在没有工作管理器的情况下执行此操作(假设在通知运行时设备具有健康的连接)。
我建议不要在接收器本身中建立您的网络，而是启动一个服务(如果高于 Android 8.0，则为前台服务)，然后在那里完成您的工作。这是因为 android 的接收器时间限制远低于服务/前台服务。所以对我来说，在网络请求完成之前你的接收器被杀死听起来很合理，所以没有显示任何通知。
您可以在服务中显示通知，还可以安排自 setExactAndAllowWhileIdle 以来的下一个警报它本身并不是一个重复的警报。所以在你的接收器中，类似:

@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);
        }
}

然后是一个可能的服务类:

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.
    }
}

要停止服务，请在显示生日通知后立即使用以下命令:

stopForeground(true);
stopSelf();

更新 : 我在我的手机(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。它在股票 android 上运行良好，但并非在所有设备上都运行良好。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。