检查是否已安排WorkManager [英] Check if WorkManager is scheduled already

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

此方法可让您排队一个唯一名称的 PeriodicWorkRequest，其中只有一个 特定名称可以一次处于活动状态.例如，您只能 希望一个同步操作处于活动状态.如果有一个未决，您可以 选择运行它还是将其替换为您的新作品.

This method allows you to enqueue a uniquely-named PeriodicWorkRequest, where only one PeriodicWorkRequest of a particular name can be active at a time. For example, you may only want one sync operation to be active. If there is one pending, you can choose to let it run or replace it with your new work.

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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