WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(id).observe 是否保证观察 WorkInfo.State.ENQUEUED

Question

我目前的 Android 申请雇用了

archWorkerRuntimeVersion = '2.3.0-beta02'

api "androidx.work:work-runtime:$archWorkerRuntimeVersion"
api "androidx.work:work-runtime-ktx:$archWorkerRuntimeVersion"

我通过 LiveData 观察工人的状态如下：-

   WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(myWorkRequest.id).observe(lifeCycleOwner, Observer {
        if (it != null && it.state == WorkInfo.State.ENQUEUED) {
            // DO SOMETHING IMPORTANT
        }
    })

我可以依靠一直观察 WorkInfo.State.ENQUEUED 的状态吗？

或者我的观察者在某些情况下不会呈现这种状态？

Answer 1

是的，尽管与此相关的事情很少需要注意，但可以保证观察到 API。以下是来自 google:

的描述

* Adds the given observer to the observers list. This call is similar to
 * {@link LiveData#observe(LifecycleOwner, Observer)} with a LifecycleOwner, which
 * is always active. This means that the given observer will receive all events and will never
 * be automatically removed. You should manually call {@link #removeObserver(Observer)} to stop
 * observing this LiveData.
 * While LiveData has one of such observers, it will be considered
 * as active.
 * <p>
 * If the observer was already added with an owner to this LiveData, LiveData throws an
 * {@link IllegalArgumentException}.

下面的观察代码应该从主线程调用，否则状态将不是最新的

WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(myWorkRequest.id).observe(lifeCycleOwner, Observer {
    if (it != null && it.state == WorkInfo.State.ENQUEUED) {
        // DO SOMETHING IMPORTANT
    }
})

WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(id).observe 是否保证观察 WorkInfo.State.ENQUEUED

Is WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(id).observe guaranteed to observe WorkInfo.State.ENQUEUED

android

android-workmanager