android - CoroutineWorker 可以安排另一个 Worker 吗？

Question

我想与 worker 安排另一份工作。但是，我在文档中找不到是否允许这样做。

类似于:

class MyWorker(context: Context, params: WorkerParameters): CoroutineWorker(context, params) {

    override val coroutineContext = Dispatchers.IO

    override suspend fun doWork(): Result = coroutineScope {
        val syncWorker = OneTimeWorkRequestBuilder<MyWorker>()
            .setInitialDelay(3000, TimeUnit.MILLISECONDS)
            .build()

        WorkManager.getInstance(context)
            .enqueueUniqueWork("MyJob", ExistingWorkPolicy.REPLACE, syncWorker)
        Result.success()
    }

Answer 1

是的，可以，但有一个异常(exception)。

唯一可能危险的情况是，如果您使用来自同一工作人员实例的 ExistingWorkPolicy.REPLACE 对唯一工作人员进行排队(以您的示例为例，您无法从同一工作人员重新安排工作) syncWorker):

class syncWorker(context: Context, params: WorkerParameters): CoroutineWorker(context, params) {

    override suspend fun doWork(): Result {
        withContext(Dispatchers.IO) {
            val syncWorker = OneTimeWorkRequestBuilder<MyWorker>()
                .build()

            // DON'T DO THIS!!!
            // You may end up with two instances of the same worker
            // running at the same time
            WorkManager.getInstance(context)
                .enqueueUniqueWork("MyJob", ExistingWorkPolicy.REPLACE, syncWorker)
            Result.success()
        }   
    }
}

另请注意 coroutineContext is now deprecated 。请改用 withContext(Dispatchers.IO) 就像我的代码 fragment 中所示。