WorkManager的OneTimeWorkRequest的重试策略/机制是什么

Cheok Yan Cheng

我有以下临时工。

// Create a Constraints that defines when the task should run
Constraints constraints = new Constraints.Builder()
        .setRequiredNetworkType(NetworkType.UNMETERED)
        .setRequiresBatteryNotLow(true)
        // Many other constraints are available, see the
        // Constraints.Builder reference
        .build();

OneTimeWorkRequest oneTimeWorkRequest =
        new OneTimeWorkRequest.Builder(SyncWorker.class)
                .setConstraints(constraints)
                .addTag(SyncWorker.TAG)
                .build();

根据https://developer.android.com/topic/libraries/architecture/workmanager

// (Returning RETRY tells WorkManager to try this task again
// later; FAILURE says not to try again.)

我想知道，如果SyncWorker继续返回RETRY，什么是重试策略WorkManager？例如，最大重试次数是WorkManager多少？文档尚不清楚。

拉胡尔

默认值为BackoffPolicy.EXPONENTIAL。我们仅在您要求我们RETRY退货WorkerResult.RETRY或Worker现在您的约束尚未满足时重试。因此，例如，如果您需要一个NETWORK约束，而现在该设备失去了活动的Network连接，则Worker它将停止并自动重试（当满足约束时）。