我正在使用带有Rx的WorkManager(Android Jetpack)开发一个Android应用程序。下面是Worker类。
class ImageRxWorker(
appContext: Context,
private val workerParams: WorkerParameters
) : RxWorker(appContext, workerParams) {
override fun createWork(): Single<Result> = Single.create<Result> { emitter -
// do the job
emitter.onSuccess(Result.success())
}
}
它工作正常,没有问题。但我想知道的是如何处理结果呢?
class MainPresenter(
private val view: MainActivity,
private val workManager: WorkManager = WorkManager.getInstance()
) : MainContract.Presenter {
override fun startWork(): Completable {
view.showToastMessage(R.string.worker_started)
return Completable.create { emitter ->
val uploadWorkRequest = OneTimeWorkRequestBuilder<ImageRxWorker>().build()
workManager.enqueue(uploadWorkRequest)
emitter.onComplete() // This is not exit immediately.
}
}
}
我找到了“addListener”,“result”,但我不知道如何使用它们。我试图谷歌搜索,但我找不到任何好的参考。来人帮帮我!
我想......我找到了解决方案之一。
有用!!!
但是......它......非常丑陋......而且不聪明......
(在我的应用程序中,我不使用LiveData。)
override fun startWork(): Completable {
view.showToastMessage(R.string.worker_started)
return Completable.create { emitter ->
Log.d(TAG, "[WM][Presenter] startWork - start")
val workRequest = OneTimeWorkRequestBuilder<ImageRxWorker>()
.setInputData(workDataOf("TIME" to 1000L))
.build()
workManager.enqueue(workRequest)
while (workManager.getWorkInfoById(workRequest.id).get().state != WorkInfo.State.SUCCEEDED) {
// Should I really polling?
Thread.sleep(1000)
Log.d(TAG, "[WM][Presenter] not yet......")
}
Log.d(TAG, "[WM][Presenter] complete")
emitter.onComplete()
}
}
哇,这是“User One”的答案写的第三个代码。它工作正常,看起来比第二个代码更好。因为我的应用程序不使用'LiveData',我无法确保此代码是否有效。
在“observeForever”中,我在Worker完成后调用“cancelWorkById”。这是对的吗?
override fun startWork(): Completable {
view.showToastMessage(R.string.worker_started)
return Completable.create { emitter ->
Log.d(TAG, "[WM][Presenter] startWork - start")
val workRequest = OneTimeWorkRequestBuilder<ImageRxWorker>()
.setInputData(workDataOf("TIME" to 1000L))
.build()
workManager.enqueue(workRequest)
workManager.getWorkInfoByIdLiveData(workRequest.id).observeForever { workInfo ->
workInfo?.outputData?.getString("key")?.let { data ->
Log.d(TAG, "[WM][Presenter] startWork - complete: $data")
emitter.onComplete()
workManager.cancelWorkById(workRequest.id)
}
}
}
}
你使用getWorkInfoById的方法返回一个ListenableFuture,这个返回一个LiveData:
您可以通过观察getWorkInfoByIdLiveData()返回的LiveData,然后在trigerred中调用emitter.onComplete()来观察工作状态,而不是while循环,但是你的演示者中没有LifeCycle,所以你应该使用observeForever()并负责删除观察者,
这是一个例子:
workManager.getWorkInfoByIdLiveData(workRequest.id)
.observeForever(object : Observer<WorkInfo> {
override fun onChanged(workInfo : WorkInfo?) {
if(workInfo.state == WorkInfo.State.SUCCEEDED) {
////The Work result is a Success
}
/* Here We remove the Observer if Not needed anymore
'this' here = the Observer */
workManager.getWorkInfoByIdLiveData(workRequest.id)
.removeObserver(this)
}
或者只是使用getWorkInfoById()返回的ListenableFuture来获取CallBack