PeriodicWorkRequest 运行过于频繁

Question

我正在尝试实现一个每 1.5 小时更新一次天气数据的工作人员。我正在使用PeriodicWorkRequestBuilder并指定了时间，如我的代码所示：

@RequiresApi(Build.VERSION_CODES.O)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val workRequest = PeriodicWorkRequestBuilder<WeatherUpdateWorker>(
                repeatInterval = 90,
                repeatIntervalTimeUnit = TimeUnit.MINUTES,
            ).setBackoffCriteria(
                backoffPolicy = BackoffPolicy.LINEAR,
                duration = Duration.ofSeconds(15)
            )
                .build()

            WorkManager.getInstance(applicationContext).enqueueUniquePeriodicWork(
                "WeatherUpdateWork",
                ExistingPeriodicWorkPolicy.KEEP,
                workRequest
            )

但是，当我检查 Logcat 时，我的工作日志显示它每 15 分钟执行一次。我该如何解决这个问题？

我已向我的工作人员添加日志以显示其被调用的时间：

@HiltWorker
class WeatherUpdateWorker @AssistedInject constructor(
    private val api: WeatherService,
    @Assisted val context: Context,
    @Assisted workerParameters: WorkerParameters,
    private val viewModel: WeatherViewModel
): CoroutineWorker(context, workerParameters) {
    override suspend fun doWork(): Result {

        try {
            val response = api.getWeather()
            viewModel.setWeatherResults(response)

            val currentTime = System.currentTimeMillis()
            saveLastExecutionTime(currentTime)

            Log.d("WeatherWorker", "Success, ${currentTime}")
            return Result.success()
        } catch (e: Exception) {
            Log.d("WeatherWorker", "Error")
            return Result.retry()
        }
    }

    private fun saveLastExecutionTime(currentTime: Long) {
        val sharedPreferences = context.getSharedPreferences("weather_prefs", Context.MODE_PRIVATE)
        sharedPreferences.edit().putLong("last_execution_time", currentTime).apply()
    }
}

工人工厂：

@HiltAndroidApp
class Application : Application(), Configuration.Provider {

    @Inject
    lateinit var workerFactory: CustomWorkerFactory

    override fun getWorkManagerConfiguration() =
        Configuration.Builder()
            .setMinimumLoggingLevel(Log.DEBUG)
            .setWorkerFactory(workerFactory)
            .build()

}

class CustomWorkerFactory @Inject constructor(private val api: WeatherService, private val viewModel: WeatherViewModel): WorkerFactory() {
    override fun createWorker(
        appContext: Context,
        workerClassName: String,
        workerParameters: WorkerParameters
    ): ListenableWorker? = WeatherUpdateWorker(api, appContext, workerParameters, viewModel)

Answer 1

最有可能的是，因为您使用的是

ExistingPeriodicWorkPolicy.KEEP

，所以您现有的 periodicworkrequestbuilder 的周期为 15 分钟，并且您对 1.5 小时周期的更改将被忽略，如文档中所述的 ExistingPeriodicWorkPolicy.KEEP

如果存在具有相同唯一名称的现有待处理（未完成）工作，则不执行任何操作。否则，插入新指定的作品。

最好使用

ExistingPeriodicWorkPolicy.REPLACE

或

ExistingPeriodicWorkPolicy.UPDATE