因此,在查看Constraints类之后,我没有找到任何添加时间约束的函数。例如,我想在早上8点开始执行工作(工作可以是OneTimeWorkRequest或PeriodicWorkRequest中的任何一种)。如何添加约束以安排使用WorkManager执行此工作。
很遗憾,目前你无法在特定时间安排工作。如果您有时间关键的实现,则应使用AlarmManager设置闹钟,可以使用setAndAllowWhileIdle()或setExactAndAllowWhileIdle()在Doze模式下触发。
您可以使用以下方式使用WorkManager
安排一次性初始延迟或定期执行工作:
创建Worker类:
public class MyWorker extends Worker {
@Override
public Worker.WorkerResult doWork() {
// Do the work here
// Indicate success or failure with your return value:
return WorkerResult.SUCCESS;
// (Returning RETRY tells WorkManager to try this task again
// later; FAILURE says not to try again.)
}
}
然后按照以下方式安排OneTimeWorkRequest
:
OneTimeWorkRequest mywork=
new OneTimeWorkRequest.Builder(MyWorker.class)
.setInitialDelay(<duration>, <TimeUnit>)// Use this when you want to add initial delay or schedule initial work to `OneTimeWorkRequest` e.g. setInitialDelay(2, TimeUnit.HOURS)
.build();
WorkManager.getInstance().enqueue(mywork);
// Create a Constraints that defines when the task should run
Constraints myConstraints = new Constraints.Builder()
.setRequiresDeviceIdle(true)
.setRequiresCharging(true)
// Many other constraints are available, see the
// Constraints.Builder reference
.build();
然后创建一个使用这些约束条件的OneTimeWorkRequest
OneTimeWorkRequest mywork=
new OneTimeWorkRequest.Builder(MyWorker.class)
.setConstraints(myConstraints)
.build();
WorkManager.getInstance().enqueue(mywork);
PeriodicWorkRequest periodicWork = new PeriodicWorkRequest.Builder(MyWorker.class, 12, TimeUnit.HOURS)
.build();
WorkManager.getInstance().enqueue(periodicWork);
这将创建一个PeriodicWorkRequest,用于每12个小时定期运行一次。
final int SELF_REMINDER_HOUR = 8;
if (DateTime.now().getHourOfDay() < SELF_REMINDER_HOUR) {
delay = new Duration(DateTime.now() , DateTime.now().withTimeAtStartOfDay().plusHours(SELF_REMINDER_HOUR)).getStandardMinutes();
} else {
delay = new Duration(DateTime.now() , DateTime.now().withTimeAtStartOfDay().plusDays(1).plusHours(SELF_REMINDER_HOUR)).getStandardMinutes();
}
PeriodicWorkRequest workRequest = new PeriodicWorkRequest.Builder(
WorkerReminderPeriodic.class,
24,
TimeUnit.HOURS,
PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS,
TimeUnit.MILLISECONDS)
.setInitialDelay(delay, TimeUnit.MINUTES)
.addTag("send_reminder_periodic")
.build();
WorkManager.getInstance()
.enqueueUniquePeriodicWork("send_reminder_periodic", ExistingPeriodicWorkPolicy.REPLACE, workRequest);
REPLACE
看起来没问题。 - VladExistingPeriodicWorkPolicy.REPLACE
呢?! - Soheil到目前为止,还无法使用PeriodicWorkRequest
实现精确的时间。
一个丑陋的解决方法是使用 OneTimeWorkRequest
,当其触发时,设置另一个具有新计算周期的 OneTimeWorkRequest
,以此类推。
我可能有点晚了,但是我还是想安排一个工作请求在指定的时间(可选短暂延迟)进行。您只需要从 TimePicker 中获取时间即可:
public static void scheduleWork(int hour, int minute) {
Calendar calendar = Calendar.getInstance();
long nowMillis = calendar.getTimeInMillis();
calendar.set(Calendar.HOUR_OF_DAY,hour);
calendar.set(Calendar.MINUTE,minute);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
if (calendar.before(Calendar.getInstance())) {
calendar.add(Calendar.DATE, 1);
}
long diff = calendar.getTimeInMillis() - nowMillis;
WorkManager mWorkManager = WorkManager.getInstance();
Constraints constraints = new Constraints.Builder()
.setRequiredNetworkType(NetworkType.CONNECTED)
.build();
mWorkManager.cancelAllWorkByTag(WORK_TAG);
OneTimeWorkRequest mRequest = new OneTimeWorkRequest.Builder(NotificationWorker.class)
.setConstraints(constraints)
.setInitialDelay(diff,TimeUnit.MILLISECONDS)
.addTag(WORK_TAG)
.build();
mWorkManager.enqueue(mRequest);
}
class NotificationJob : DailyJob() {
override fun onRunDailyJob(params: Params): DailyJobResult {
//your job
return DailyJobResult.SUCCESS
}
companion object {
val TAG = "NotificationJob"
fun scheduleJob() {
//scheduled between 9-10 am
DailyJob.schedule(JobRequest.Builder(TAG),
TimeUnit.HOURS.toMillis(9),TimeUnit.HOURS.toMillis(10 ))
}
}
}
以及通知创建器
class NotificationJobCreator : JobCreator {
override fun create(tag: String): Job? {
return when (tag) {
NotificationJob.TAG ->
NotificationJob()
else ->
null
}
}
}
然后在你的Application类中启动
JobManager.create(this).addJobCreator(NotificationJobCreator())
dependencies {
implementation 'com.evernote:android-job:1.2.6'
// or this with workmnager
implementation 'com.evernote:android-job:1.3.0-alpha08'
}
所有答案现在都已经过时了,请升级到WorkManager 2.1.0-alpha02或更高版本。setInitialDelay()方法以前仅适用于OneTimeWorkRequest,但现在它们也支持PeriodicWorkRequest。
implementation "androidx.work:work-runtime:2.1.0-alpha02"
现在,PeriodicWorkRequests已经支持了初始延迟。您可以使用PeriodicWorkRequest.Builder上的setInitialDelay方法来设置初始延迟。
快速示例:
new PeriodicWorkRequest.Builder(MyWorker.class, MY_REPEATS, TimeUnit.HOURS)
.setInitialDelay(THE_DELAY,TimeUnit.SECONDS);
我尝试过OneTimeWorkRequest,但它不太稳定(有时只能工作),所以我们不应该依赖它。AlarmManager是一个更好的选择。
OneTimeWorkRequest.Builder#setInitialDelay
是一个方法,用于设置一次性工作请求的初始延迟时间。它需要两个参数:一个long
类型的延迟时间和一个java.util.concurrent.TimeUnit
枚举类型表示的时间单位。 - pskinktimeInFutureInSeconds - timeNowInSeconds
有什么问题吗? - pskink