每次我打开我的应用程序时都会触发 Android 工作管理器

Question

我做了一个周期性的工作管理器，它的行为很严重。它不是在设定的时间间隔内执行工作，而是每分钟执行一次。每次我打开应用程序时它也会被触发。这意味着如果我在一分钟内打开我的应用程序 50 次，它会完成 50 次工作。这是我的代码

public class UpdateUserDataService extends Worker {
    public UpdateUserDataService(@NonNull Context context, @NonNull WorkerParameters workerParams) {
        super(context, workerParams);
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    @NonNull
    @Override
    public Result doWork() {
        FirebaseMessaging.getInstance().getToken().addOnSuccessListener(s -> {
            DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Update");
            SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy_h:mm a", Locale.getDefault());
            Calendar c = Calendar.getInstance();
            String currentDate = dateFormat.format(c.getTime());
            JobFooter jobFooter = new JobFooter(currentDate, s);
            reference.child(dateFormat.format(new Date())).setValue(jobFooter);

            Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
            notificationIntent.putExtra("Notification", true);
            notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            PendingIntent intent = PendingIntent.getActivity(getApplicationContext(), 0,
                    notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

            NotificationHelper notificationHelper = new NotificationHelper(getApplicationContext(), defaultSoundUri);
            Notification.Builder notificationBuilder = notificationHelper.getNotification("Title", currentDate, intent);
            notificationHelper.notify(10, notificationBuilder);
        });
        return Result.success();
    }
}

并且在我的 oncreate 方法下的主要 Activity 中

 Constraints constraints = new Constraints.Builder()
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .setRequiresBatteryNotLow(true)
                .build();
        PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest.Builder(
                UpdateUserDataService.class, 15, TimeUnit.MINUTES)
                .setConstraints(constraints)
                .build();

        WorkManager.getInstance(this).enqueue(periodicWorkRequest);

我只想让我的代码按照操作系统规范和约束每 15 分钟执行一次，而不管我的应用程序是否打开。

Answer 1

String EXPIRY_CHECK = "unique_worker_name";

 Constraints constraints = new Constraints.Builder()
            .setRequiresBatteryNotLow(true)
            .build();
            
PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest
      .Builder(UpdateUserDataService.class, 1, TimeUnit.DAYS)
      .setConstraints(constraints).build();
            
WorkManager.getInstance(this)
      .enqueueUniquePeriodicWork(EXPIRY_CHECK, ExistingPeriodicWorkPolicy.KEEP, periodicWorkRequest);

这将检查一个已经存在的 worker 是否已初始化，如果它已经在运行，则不会启动一个新的 worker。