检查是否已安排WorkManager

问题描述

如何检查WorkManager是否已安排.

How can I check if WorkManager is scheduled already.

这是我安排WorkManager的代码.

public static void scheduleWork() {
    PeriodicWorkRequest.Builder photoCheckBuilder =
            new PeriodicWorkRequest.Builder(WorkManagerService.class, TIME_INTERVAL_IN_SECONDS,
                    TimeUnit.SECONDS);
    PeriodicWorkRequest photoCheckWork = photoCheckBuilder.build();
    WorkManager instance = WorkManager.getInstance();
    if (instance != null) {
        instance.enqueueUniquePeriodicWork("TAG", ExistingPeriodicWorkPolicy.KEEP , photoCheckWork);
    }
}

我在Application类的onCreate()中调用scheduleWork().即使通过 此方法 ，我也可以检查我的服务是否正在运行.但是我不希望安排WorkManager，前提是已经安排了WorkManager来消除计划的时间中的不一致之处.

I call scheduleWork() in onCreate() of my Application class.Even I can check my service is running or not by this method. But I don't want schedule WorkManager if it is already scheduled to remove inconsistency in scheduled time.

像

if(!workManagerIsScheduled())
   {
     scheduleWork();
   }

有解决方案吗?

推荐答案

更新

如果您只是因为不想重复工作而需要检查已经在运行的工作管理器.您可以简单地使用 enqueueUniquePeriodicWork()

因此您无需担心作品的重复性.

So you don't need to worry about duplicacy about works.

 workmanager.enqueueUniquePeriodicWork(TAG, ExistingPeriodicWorkPolicy.KEEP , photoCheckWork);

• TAG是唯一名称，工作经理将使用它来检查重复性.
• 您可以在 ExistingPeriodicWorkPolicy.KEEP和ExistingPeriodicWorkPolicy.REPLACE之间进行选择.
• Where TAG is unique name by which work manager will check duplicacy.
• You can choose between ExistingPeriodicWorkPolicy.KEEP and ExistingPeriodicWorkPolicy.REPLACE.

我在找不到任何方法时创建了此方法.

I created this method when I did not find any.

private boolean isWorkScheduled(String tag) {
    WorkManager instance = WorkManager.getInstance();
    ListenableFuture<List<WorkInfo>> statuses = instance.getWorkInfosByTag(tag);
    try {
        boolean running = false;
        List<WorkInfo> workInfoList = statuses.get();
        for (WorkInfo workInfo : workInfoList) {
            WorkInfo.State state = workInfo.getState();
            running = state == WorkInfo.State.RUNNING | state == WorkInfo.State.ENQUEUED;
        }
        return running;
    } catch (ExecutionException e) {
        e.printStackTrace();
        return false;
    } catch (InterruptedException e) {
        e.printStackTrace();
        return false;
    }
}

if (your_work_manager.version < 1.0.0-alpha11)

private boolean isWorkScheduled(String tag) {
    WorkManager instance = WorkManager.getInstance();
    LiveData<List<WorkStatus>> statuses = instance.getStatusesByTag(tag);
    if (statuses.getValue() == null) return false;
    boolean running = false;
    for (WorkStatus workStatus : statuses.getValue()) {
        running = workStatus.getState() == State.RUNNING | workStatus.getState() == State.ENQUEUED;
    }
    return running;
}

当某些任务为 RUNNING 或 ENQUEUED 时，它将返回 true .

It will return true when some of its task is RUNNING or ENQUEUED.

public static final String TAG_MY_WORK = "mywork";

if(!isWorkScheduled(TAG_MY_WORK)) { // check if your work is not already scheduled
    scheduleWork(TAG_MY_WORK); // schedule your work
}

public static void scheduleWork(String tag) {
    PeriodicWorkRequest.Builder photoCheckBuilder =
            new PeriodicWorkRequest.Builder(WorkManagerService.class, TIME_INTERVAL_IN_SECONDS,
                    TimeUnit.SECONDS);
    PeriodicWorkRequest photoCheckWork = photoCheckBuilder.build();
    WorkManager instance = WorkManager.getInstance();
    instance.enqueueUniquePeriodicWork(tag, ExistingPeriodicWorkPolicy.KEEP , photoCheckWork);
}

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