标签: android-workmanager

我们有一个 Android 应用程序，使用 WorkManager 来处理后台同步工作。我们的同步工作者是这样的：

public class SyncWorker extends Worker {

    [...]

    @NonNull
    @Override
    public Result doWork() {

        if (canNotRetry(getRunAttemptCount())) {
            // This could seem unreachable, consider removing... or not... because if stopped by the
            // system, the work might be retried by design
            CBlogger.INSTANCE.log([...]);
            return Result.success();
        }

        boolean syncOk = false;

        //Sync
        try (Realm realm = Realm.getDefaultInstance()) {

            // Doing sync related ops & network calls
            // checking this.isStopped() between operations to quit
            // sync activity when worker has …

Work [ id=ab50e634-d315-4566-acc2-fe146a7366e2, tags={ in.offline.usecase.Upload****s$Worker, upload/***/now/* } ] was cancelled
java.util.concurrent.CancellationException: Task was cancelled.
    at androidx.work.impl.utils.futures.AbstractFuture.cancellationExceptionWithCause(AbstractFuture.java:1184)
    at androidx.work.impl.utils.futures.AbstractFuture.getDoneValue(AbstractFuture.java:514)
    at androidx.work.impl.utils.futures.AbstractFuture.get(AbstractFuture.java:475)
    at androidx.work.impl.WorkerWrapper$2.run(WorkerWrapper.java:284)
    at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.lang.Thread.run(Thread.java:764)

为什么工作管理器开发人员无法显示取消的原因，这个问题已经存在一年左右了，他们正在提供前台支持，但没有解决基本问题。

我正在使用 ListenableWorker 来执行后台任务。我也希望操作系统意识到我的服务重要性，所以我打电话

 setForegroundAsync(new ForegroundInfo(WorkerConstants.NOTIFICATION_FOREGROUND_ID,
 builder.build()));

正如谷歌文档中所建议的那样。

但是当我的服务停止或取消时，我仍然可以看到前台服务通知并且我无法删除它。

此外，我在此通知中添加了取消按钮，但它什么也没做，我无法关闭它：

PendingIntent intent = WorkManager.getInstance(getApplicationContext())
                            .createCancelPendingIntent(getId());
                    builder.addAction(R.drawable.ic_redesign_exit,"Stop",intent);

有什么建议？

在这里做一些Jeopardy 风格的问答。

我有一些工作有时需要按照2.7.0 版本中所述的方式快速运行：WorkManager

val constraints = Constraints.Builder()
    .setRequiredNetworkType(NetworkType.CONNECTED).build()
val oneTimeWorkRequest = OneTimeWorkRequest.Builder(MyWorker::class.java)
    .setInitialDelay(2, TimeUnit.SECONDS)
    .setExpedited(OutOfQuotaPolicy.RUN_AS_NON_EXPEDITED_WORK_REQUEST)
    .setConstraints(constraints).build()
WorkManager.getInstance(context).enqueueUniqueWork("my-identifier", ExistingWorkPolicy.REPLACE, oneTimeWorkRequest)

我相信代码在 Android 12/S 上运行得很好，但是当作业在 Android 11 上运行时，我收到以下错误：

E/WM-WorkerWrapper: Work [ id=<UUID>, tags={ [WorkerTag] } ] failed because it threw an exception/error
     java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Expedited WorkRequests require a ListenableWorker to provide an implementation for `getForegroundInfoAsync()`
        at androidx.work.impl.utils.futures.AbstractFuture.getDoneValue(AbstractFuture.java:516)
        at androidx.work.impl.utils.futures.AbstractFuture.get(AbstractFuture.java:475)
        at androidx.work.impl.WorkerWrapper$2.run(WorkerWrapper.java:311)
        at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)

我需要做什么？