Kotlin WorkManager使用方法详解

class SimpleWorker(context: Context, params: WorkerParameters) : Worker(context, params) {
    override fun doWork(): Result {
        Log.d("SimpleWorker", "do work in SimpleWorker")
        return Result.success()
    }
}

 //设置约束条件
 //NetworkType.CONNECTED 最通用的连上网络
 //NetworkType.UNMETERED  WF
 //NetworkType.METERED 流量，4G
  val constraints: Constraints =Constraints.Builder()
       .setRequiredNetworkType(NetworkType.CONNECTED)
       .build()
  val request=OneTimeWorkRequest.Builder(SimpleWorker::class.java)
        .setConstraints(constraints)
        .build()

WorkManager.getInstance(context).enqueue(request)

val request=OneTimeWorkRequest.Builder(SimpleWorker::class.java)
                .setInitialDelay(5,TimeUnit.MINUTES)
                .build()

val request=OneTimeWorkRequest.Builder(SimpleWorker::class.java)
                ...
                .addTag("simple")
                .build()

WorkManager.getInstance(this).cancelAllWorkByTag("simple")

WorkManager.getInstance(this).cancelAllWorkById(request.id)

WorkManager.getInstance(this).cancelAllWork()

val request=OneTimeWorkRequest.Builder(SimpleWorker::class.java)
                ...
                .setBackoffCriteria(BackoffPolicy.LINEAR,10,TimeUnit.SECONDS)
                .build()

WorkManager.getInstance(this).getWorkInfoByIdLiveData(request.id).observer(this){workInfo->
    if(workInfo.state==WorkInfo.State.SUCCEEDED){
        Log.d("MainActivity","do work succeeded")
    }else if(workInfo.state==WorkInfo.State.FAILED){
         Log.d("MainActivity","do work failed")
    }
}

val sync=...
val compress=...
val upload=...
WorkManager.getInstance(this)
   .beginWith(sync)
   .then(compress)
   .then(upload)
   .enqueue()