There are two question I wanna ask.
The value for timeout option is in seconds or miliseconds?
Where to execute code if the timeout reached? (do something after timeout)
.
let wait: string;
wait = Plugins.Geolocation.watchPosition({
enableHighAccuracy: true,
timeout:5 // i dont if this is seconds or miliseconds
}, (position, err) => {
// do something
Plugins.Geolocation.clearWatch({
id: wait
});
});
// i want to detect if the location still doesnt detect, and it already time-out, i want to do something
The documention is too simple.
Very hard to understand. https://capacitor.ionicframework.com/docs/apis/geolocation/
The timeout is defined in miliseconds based on the assumption, that the Capacitor API is probably equal to the Web Geolocation API. If the timeout is reached and watchPosition() couldn't get a position, you should be able to check your err value.
Related
I am new to periodic background sync, What I want to achieve is that my website should ping to the server at 5 hours of interval by doing so It will receive data from server which will then be processed. I wanted to know if it's possible to set minInterval in periodic background sync to 5 hours or we can't. If their is another method to achieve this can you please give me some source or even an code example might be good.
In this following example of MDN they have set it to one day. Can I reduce it to 5 hours.?
async function registerPeriodicNewsCheck() {
const registration = await navigator.serviceWorker.ready;
try {
await registration.periodicSync.register('get-latest-news', {
minInterval: 24 * 60 * 60 * 1000,
});
} catch {
console.log('Periodic Sync could not be registered!');
}
}
Thanks for your help.
I am trying to get a switch widget to turn off at a specific time of the day.
I have read a lot of the documentations like these
https://stackoverflow.com/questions/15848214/does-dart-have-a-scheduler
https://pub.dev/packages/cron
https://pub.dev/packages/scheduled_timer
All of these which can only allow me to set duration instead of a specific time.
Thus, my only approach right now is by setting up the timer when the switch is turned on.
e.g. 8hrs then it turns off.
Problem: If the user turned on the switch late, the time that it turns off will also be delayed.
So is there an actual way to set an event at a specific time + works even after we onstop/terminate the application?
You can try to do something like this:
I'll simplify the specific time into :
...
var setTime = DateTime.utc(2022, 7, 11, 8, 48, 0).toLocal();
StreamSubscription? subscription;
...
Then you can assign a periodic stream listener:
...
// periodic to run every second (you can change to minutes/hours/others too)
var stream = Stream.periodic(const Duration(seconds: 1), (count) {
//return true if the time now is after set time
return DateTime.now().isAfter(setTime);
});
//stream subscription
subscription = stream.listen((result) {
// if true, insert function and cancel listen subscription
if(result){
print('turn off');
subscription!.cancel();
}
// else if not yet, run this function
else {
print(result);
}
});
...
However, running a Dart code in a background process is more difficult, here are some references you can try:
https://medium.com/flutter/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124
https://pub.dev/packages/flutter_background_service
I hope it helps, feel free to comment if it doesn't work, I'll try my best to help.
After some time I figured it out.
Format
cron.schedule(Schedule.parse('00 00 * * *'), () async {
print("This code runs at 12am everyday")
});
More Examples
cron.schedule(Schedule.parse('15 * * * *'), () async {
print("This code runs every 15 minutes")
});
To customize a scheduler for your project, read this
I am utilizing cellChanged.node.setDataValue(fieldChanged, oldValue) inside of the (cellValueChanged) event emitter, and I'm having trouble figuring out how to call a function once the setDataValue function has finished executing. I need to do this to do a check to see if a user has the permission to update a cell.
Here is the full code that checks:
if(this.showPaywallNotification) {
// Okay, so the budget is above what we allow HOWEVER...
if(budget > BUDGET_AMOUNT) {
this.showPaywallNotification = false;
cellChanged.node.setDataValue(fieldChanged, oldValue)
// Note: This timeout is in place to prevent the infinite updating bug
// This is problematic because if the user changes the cells fast enough, they can get around the paywall. If I change the timeout to be smaller, the resulting change triggers the update, which ends up creating an infinite loop of updates.
setTimeout(() => {
this.showPaywallNotification = true;
}, 230)
}
}
Is there a way I can replace my setTimeout() function with something better that can always ensure the user can't get around my paywall by just updating the cell faster than the timeout can execute?
You don't have to do polling. setDataValue is a not an async function.
Also, onCellValueChanged won't get called again if you call node.setDataValue.
Have a look at this plunk: Cell Editing - Revert to old value. Try updating any Age value to negative.
onCellValueChanged($event) {
if ($event.colDef.field === 'age' && $event.newValue < 0) {
// debugger
$event.node.setDataValue('age', $event.oldValue);
console.log('value reverted');
}
}
Let me know if something is not clear, or this is not sufficient.
whit this code i can get gps data and retrive address all works fine in background, for some minuts, after 20 minuts about,the app semms stop do what i aspect.
i tryed battery concession and other possible things, ive tryed backgroud service.
But nothing seems to wor for get position in background, after lomg time.
Any suggestion.
this.backgroundGeolocation.configure(config).then(() => {
console.log('backgroundGeolocation configconfigconfigconfigconfigconfig');
this.backgroundGeolocation.on(BackgroundGeolocationEvents.location).subscribe((location: BackgroundGeolocationResponse) => {
console.log(location);
this.ngZone.run(() => {
this.geolocationService.nativeGeocoder.reverseGeocode(location.latitude,
location.longitude).then((result: NativeGeocoderResult[]) =>{
console.log("JSON.stringify(result[0]",JSON.stringify(result[0]));
this.comunenoreplace = result[0]['locality'];
this.comune = result[0]['locality'].replace(/[^A-Z0-9]+/ig, "-");
this.provincia = result[0]['subAdministrativeArea'].replace(new RegExp('Città Metropolitana di|Provincia di', 'g'), '');
this.globalLatitude = location.latitude;
this.globalLongitude = location.longitude;
}).catch((error: any) => console.log("reverseGeocode", error));
});
// IMPORTANT: You must execute the finish method here to inform the native plugin that you're finished,
// and the background-task may be completed. You must do this regardless if your operations are successful or not.
// IF YOU DON'T, ios will CRASH YOUR APP for spending too much time in the background.
// this.backgroundGeolocation.finish;
});
});
you can use the https://ionicframework.com/docs/native/background-mode
it just modify the sleep mode for apps to make them work in background (without killing the process).
If the process is killed, so the app may stop sending datas.
Then you have "cordova.plugins.backgroundMode.excludeFromTaskList()"; to make it disappear from the tasklist (Android 5.0+)
Hope this help :)
I need to ensure that a certain HTTP request was send successfully. Therefore, I'm wondering if a simple way exists to move such a request into a background service task.
The background of my question is the following:
We're developing a survey application using flutter. Unfortunately, the app is intended to be used in an environment where no mobile internet connection can be guaranteed. Therefore, I’m not able to simply post the result of the survey one time but I have to retry it if it fails due to network problems. My current code looks like the following. The problem with my current solution is that it only works while the app is active all the time. If the user minimizes or closes the app, the data I want to upload is lost.
Therefore, I’m looking for a solution to wrap the upload process in a background service task so that it will be processed even when the user closes the app. I found several posts and plugins (namely https://medium.com/flutter-io/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124 and https://pub.dartlang.org/packages/background_fetch) but they don’t help in my particular use case. The first describes a way how the app could be notified when a certain event (namely the geofence occurred) and the second only works every 15 minutes and focuses a different scenario as well.
Does somebody knows a simple way how I can ensure that a request was processed even when there is a bad internet connection (or even none at the moment) while allowing the users to minimize or even close the app?
Future _processUploadQueue() async {
int retryCounter = 0;
Future.doWhile(() {
if(retryCounter == 10){
print('Abborted after 10 tries');
return false;
}
if (_request.uploaded) {
print('Upload ready');
return false;
}
if(! _request.uploaded) {
_networkService.sendRequest(request: _request.entry)
.then((id){
print(id);
setState(() {
_request.uploaded = true;
});
}).catchError((e) {
retryCounter++;
print(e);
});
}
// e ^ retryCounter, min 0 Sec, max 10 minutes
int waitTime = min(max(0, exp(retryCounter)).round(), 600);
print('Waiting $waitTime seconds till next try');
return new Future.delayed(new Duration(seconds: waitTime), () {
print('waited $waitTime seconds');
return true;
});
})
.then(print)
.catchError(print);
}
You can use the plugin shared_preferences to save each HTTP response to the device until the upload completes successfully. Like this:
requests: [
{
id: 8eh1gc,
request: "..."
},
...
],
Then whenever the app is launched, check if any requests are in the list, retry them, and delete them if they complete. You could also use the background_fetch to do this every 15 minutes.