如何在不立即使用WorkManager运行的情况下更改定期工作请求周期?

有没有办法做你想做的事情,定期工作在一个干净的方式。

doWork 方法,就在返回之前 Result.SUCCESS :

fun doWork(): Result {
  reallyDoWork()
  // Now schedule the next "periodic" work
  val request = OneTimeWorkRequestBuilder<FooWorker>().build()
  WorkManager.getInstance().enqueueUniqueWork(
    "FOO",
    ExistingWorkPolicy.REPLACE,
    request
  )
  return Result.SUCCESS
}

使用此设置,您的 onCreate() 属于 Application 可安全使用 ExistingWorkPolicy.KEEP

enqueueUniquePeriodicWork .

  val request = PeriodicWorkRequest.Builder(FooWorker::class.java, 1, TimeUnit.DAYS).build()
  WorkManager.getInstance(appContext)
  .enqueueUniquePeriodicWork(WORK_TAG, ExistingPeriodicWorkPolicy.REPLACE, request)

一定要通过 ExistingPeriodicWorkPolicy ExistingWorkPolicy

如果你想用 ExistingPeriodicWorkPolicy.KEEP 而要仅在要更改重复间隔时更新PeriodicWorkRequest,WorkManager没有解决方案,但您可以将间隔保存在SharedReferences中,并检查间隔是否已更改。基于此,我们可以使用 或 ExistingPeriodicWorkPolicy.REPLACE

public static void enqueue(Context context) {
        Log.d(TAG, "enqueue()");
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
        int repeatInterval = sharedPreferences.getInt("REPEAT_INTERVAL_HOURS", 0);

        PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest
            .Builder(FooWorker.class, REPEAT_INTERVAL_HOURS, TimeUnit.HOURS)
            .build();

        ExistingPeriodicWorkPolicy policy = repeatInterval == REPEAT_INTERVAL_HOURS ? ExistingPeriodicWorkPolicy.KEEP : ExistingPeriodicWorkPolicy.REPLACE;

        sharedPreferences.edit().putInt("REPEAT_INTERVAL_HOURS", REPEAT_INTERVAL_HOURS).apply();

        WorkManager.getInstance(context).enqueueUniquePeriodicWork("fileRemove", policy, periodicWorkRequest);
    }