铜陵网站建设维护,中国品牌100强排名,专业网网站建设,如何做医疗网站的专题页WorkManager简介#xff1a; WorkManager 是 Android Jetpack 库中的一个重要组件。它用于处理那些需要在后台可靠执行的任务#xff0c;这些任务可以是一次性的#xff0c;也可以是周期性的#xff0c;甚至是需要满足特定条件才执行的任务。例如#xff0c;它可以用于在后…WorkManager简介 WorkManager 是 Android Jetpack 库中的一个重要组件。它用于处理那些需要在后台可靠执行的任务这些任务可以是一次性的也可以是周期性的甚至是需要满足特定条件才执行的任务。例如它可以用于在后台上传文件、下载更新、清理缓存等操作。 与传统的后台处理方式相比WorkManager 具有很多优势。它可以根据设备的状态如网络可用性、电量等智能地调度任务确保任务能够在合适的时机执行。即使应用程序进程被杀死它依然能够保证任务的执行这对于一些重要的后台任务来说是非常关键的。 // 创建DataData data new Data.Builder().putString(inputData, Jay).build();// 创建触发条件 (触发条件满足不会立刻执行Constraints constraints new Constraints.Builder().setRequiredNetworkType(NetworkType.NOT_REQUIRED).build();// 创建一次性执行的任务OneTimeWorkRequest workRequest1 null;if (Build.VERSION.SDK_INT Build.VERSION_CODES.O) {workRequest1 new OneTimeWorkRequest.Builder(MyWork.class)// 设置触发条件.setConstraints(constraints)// 设置延迟执行.setInitialDelay(5, TimeUnit.SECONDS)// 指数退避策略如果返回结果是retry那么按线性2s重复执行大概就是248.setBackoffCriteria(BackoffPolicy.LINEAR, Duration.ofSeconds(2))// 设置标签.addTag(workRequest1)// 参数传递.setInputData(data).build();}// 任务提交给系统WorkManager workManager WorkManager.getInstance(this);// 将任务加入workManager队列workManager.enqueue(workRequest1);// 观察任务状态workManager.getWorkInfoByIdLiveData(workRequest1.getId()).observe(this, new ObserverWorkInfo() {Overridepublic void onChanged(WorkInfo workInfo) {Log.d(test, workInfo.toString());if (workInfo ! null) {String outString workInfo.getOutputData().getString(key);Log.d(test, outString outString);}}});// 取消任务OneTimeWorkRequest finalWorkRequest workRequest1;new Timer().schedule(new TimerTask() {Overridepublic void run() {workManager.cancelWorkById(finalWorkRequest.getId());}}, 2000);// 创建周期性任务 (周期不可少于15minif (Build.VERSION.SDK_INT Build.VERSION_CODES.O) {PeriodicWorkRequest periodicWorkRequest new PeriodicWorkRequest.Builder(MyWork.class, Duration.ofMinutes(15)).build();workManager.enqueue(periodicWorkRequest);}MyWork继承Worker类在满足条件时执行Work
public class MyWork extends Worker {public MyWork(NonNull Context context, NonNull WorkerParameters workerParams) {super(context, workerParams);}NonNullOverridepublic Result doWork() {
// SystemClock.sleep(2000);String inputData getInputData().getString(inputData);Log.d(test,MyWork doWork inputData);// 将参数传递回去Data data new Data.Builder().putString(key, 执行成功).build();return Result.success(data);}
}任务组合 public void addWork(View view) {OneTimeWorkRequest workRequest1 new OneTimeWorkRequest.Builder(AWorker.class).build();OneTimeWorkRequest workRequest2 new OneTimeWorkRequest.Builder(BWorker.class).build();OneTimeWorkRequest workRequest3 new OneTimeWorkRequest.Builder(CWorker.class).build();OneTimeWorkRequest workRequest4 new OneTimeWorkRequest.Builder(DWorker.class).build();OneTimeWorkRequest workRequest5 new OneTimeWorkRequest.Builder(EWorker.class).build();// 任务组合WorkContinuation workContinuation1 WorkManager.getInstance(this).beginWith(workRequest3).then(workRequest4);WorkContinuation workContinuation2 WorkManager.getInstance(this).beginWith(workRequest1).then(workRequest2);ListWorkContinuation list new ArrayList();list.add(workContinuation1);list.add(workContinuation2);WorkContinuation.combine(list).then(workRequest5).enqueue();}
