我目前正在努力调用rest api并在UI上显示数据。我正在使用rxAndroid和Retrofit。以下是代码:
disposable.add(apiService.getIncidents(1, "true")
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.map(new Function<IncidentResponse, List<Incident>>() {
@Override
public List<Incident> apply(
@io.reactivex.annotations.NonNull final IncidentResponse incidentResponse)
throws Exception {
return incidentResponse.getIncidents();
}
})
.subscribe(new Consumer<List<Incident>>() {
@Override
public void accept(
@io.reactivex.annotations.NonNull final List<Incident> incidents)
throws Exception {
recyclerView.setAdapter(mIncidentAdapter);
displayIncidents(incidents);
}
})
);
这工作正常,我能够获取数据并在UI上显示。现在,作为增强功能的一部分,即使我的应用程序处于后台或已终止运行,我也需要定期获取此数据。我尝试了以下代码:
disposable.add(((apiService.getIncidents(1, "true")).interval(10,TimeUnit.SECONDS))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.map(new Function<IncidentResponse, List<Incident>>() {
@Override
public List<Incident> apply(
@io.reactivex.annotations.NonNull final IncidentResponse incidentResponse)
throws Exception {
return incidentResponse.getIncidents();
}
})
.subscribe(new Consumer<List<Incident>>() {
@Override
public void accept(
@io.reactivex.annotations.NonNull final List<Incident> incidents)
throws Exception {
recyclerView.setAdapter(mIncidentAdapter);
displayIncidents(incidents);
}
})
);
但是我在方法映射上遇到“无法应用Observable中的”编译错误。这是正确的方法还是使用RxAndroid无法完成?
答案 0 :(得分:0)
您的问题的答案是使用JobScheduler或使用工作管理器以特定间隔运行任务。
我个人建议您使用工作管理器,因为即使您的应用程序处于后台,您也可以安排任务定期执行。
MyWorker.kt
class MyWorker(val ctx: Context, val params: WorkerParameters)
: Worker(ctx, params) {
override fun doWork(): Result {
//Here you can run place your api call
return Result.success()
}
Activity.kt
val workManager = WorkManager.getInstance()
val myWork = PeriodicWorkRequest.Builder(MyWorker::class.java, 15, TimeUnit.MINUTES)
.addTag(TAG)
.setConstraints(constraints)
.build()
workManager.enqueueUniquePeriodicWork(TAG, ExistingPeriodicWorkPolicy.KEEP, myWork)//starts work Manager
答案 1 :(得分:0)
这是一个有效的示例 该示例将每5秒发送一次请求。根据需要进行更改
Observable.interval(1, 5, TimeUnit.SECONDS)
.flatMap(new Function<Long, ObservableSource<List<ActivityGroup>>>() {
@Override
public ObservableSource<List<ActivityGroup>> apply(Long aLong) throws Exception {
return ServiceGenerator.createService(ActivityGroupAPI.class).getActivityGroup().subscribeOn(Schedulers.io());
}
})
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new DisposableObserver<List<ActivityGroup>>() {
@Override
public void onNext(List<ActivityGroup> activityGroups) {
Calendar cal = Calendar.getInstance();
Timber.i("%s: %s", cal.getTime().toString(), activityGroups.size());
}
@Override
public void onError(Throwable e) {
e.printStackTrace();
}
@Override
public void onComplete() {
}
});
Logcat
SettingsActivity: Wed Mar 27 16:42:25 GMT+05:45 2019: 2
SettingsActivity: Wed Mar 27 16:42:29 GMT+05:45 2019: 2
SettingsActivity: Wed Mar 27 16:42:34 GMT+05:45 2019: 2
SettingsActivity: Wed Mar 27 16:42:39 GMT+05:45 2019: 2
SettingsActivity: Wed Mar 27 16:42:44 GMT+05:45 2019: 2