I am creating an application which sends the location information to the server. But when the back or home button is clicked the application is stopped. Is there a way to make the application run continuously in background and sends data to the server ?
Use a background Service. Services are application components which can run in the background without user interaction. A good tutorial on Service in android is from this.
You probably want to start the service on launch of your Activity, or you can register for system broadcasts like BOOT_COMPLETE to keep your service running from boot up.
However, keeping your service running throughout without user knowledge is a bad idea, and drains battery also. You probably want to wake up the service using AlarmManager, do processing, schedule next restart, and exit.
You need to run a Service class for your own application.
Refer docs for more information.
Related
I need to create a service that runs alongside the android app,irrespective of which screen of the app the user is on.
The app is a chat application so when the device is offline the service should queue up all the messages that are being sent offline and when the device is connected it should sync all messages.
I have written code for the job scheduler to sync data automatically when the device is online but while the app is active i would like to handle this manually.
Creating a Long Running service.
Operating system still can terminate the service in low memory and possibly other situations. There are 2 ways to overcome this:
If you are implementing the service, override onStartCommand() and return START_STICKY as the result. It will tell the system that even if it will want to kill your service due to low memory, it should re-create it as soon as memory will be back to normal.
AlarmManager .A system service, which will execute actions periodically. That will ensure that if your service will be terminated, or even the whole process will die(for example with force close) - it will be 100% restarted by AlarmManager.
Thank you.
You can do this by simple following steps:
Create Simple Service and after first launch of app just start at splash screen.
In Service after getting one data you can call another request.
After that you can create one broadcast action globally which will always call every network changed.
At background you can sync again data and saved it to shared preferences or as per your your requirement.
For interval you can also using AlarManager.
A part from this you can simply create Service using JobSheduler in this you can assign job and time as well.
Refer link :
https://developer.android.com/reference/android/app/job/JobScheduler.html
Hopefully this logic will helps you.
You have to use a intent service with sticky instead of service for this which will be executed in a queue and do your work. And since it is a intent service it will be started automatically after sometime, when system kills the service process.
I'm trying to develop a mobile application which interact with ibeacons !
I'm developing this application for iPhone and android ! But i have problem !When i was developing iphone app, everything works,
i receive my notification even if my app is killed !
But on android i don't know how can i develop that !
If my application is on background, it works but if i kill my app, nothing happen !
Do you have an idea to run my code even if app is killed?
Thank by advance!
If you want run some code in background even if your application is killed you should use services. From google documentation:
A Service is an application component that can perform long-running operations in the background, and it does not provide a user interface. Another application component can start a service, and it continues to run in the background even if the user switches to another application. Additionally, a component can bind to a service to interact with it and even perform interprocess communication (IPC). For example, a service can handle network transactions, play music, perform file I/O, or interact with a content provider, all from the background.
If your app runs in scheduled times you can use JobScheduler or AlarmManger. JobScheduler and AlarmManager wrok with services.
You can use Service. It will still working even if your activity is killed.
https://developer.android.com/guide/components/services.html
I want to implement a service (or similar) on Android KitKat (4.4.2) in order to detect which is the foreground app and make something depending on which app it is "foregrounded".
I have read a lot of threads about determining which is the app is the foregound ON THAT MOMENT (https://stackoverflow.com/a/14044662/1683141). But I'm not able to see any thread about keeping this service continuosly monitoring in order to detect any changes on foreground. Kind of loop? Event registering?
For example, I want to be notified when LINE (messaging app) has or loses foreground. So I suppose the service has to be registered to some kind of event (I think Broadcast here is useless) in order to be notified and then take some action.
I don't know if that is possible. I hope it is.
Thank you for your help.
You are unable to keep your service alive if system decide to kill it. You are also unable to keep your service alive if your app is "unloaded" (whatever you mean), because your service is part of your app (and APK) and will be unloaded too.
I have started a service from my application and from that service a worker thread is started .I want my service to run even application goes background and until the user kills/exits the application.
But some cases my service got killed due to low memory ,then used sticky service or making the app to foreground to restart the service.
My issue is I dont want to lose the data between service ending and restarting time ,so is it possible to start another thread from service ondestroy method, but in this case how we can control that thread.
Please let me know is it the right approach ,and is this usecase achievable
I want my service to run even application goes background and until the user kills/exits the application.
This is not possible. The user can always get rid of your app, via Force Close in Settings, or via some device's version of the recent-tasks list.
But some cases my service got killed due to low memory
No, your process is terminated for low memory.
My issue is I dont want to lose the data between service ending and restarting time ,so is it possible to start another thread from service ondestroy method
No, because your process is being terminated.
Please let me know is it the right approach
Probably not. Very few apps need a service that runs constantly, which is why Android, and its users, go to great lengths to control such services. I would recommend that you try to find some solution to whatever your problem is that does not need a service running constantly.
What are the disadvantages of running services in Android in Foreground.??
I recently read that if you want your services to last longer and not get killed easily we need to run the service in foreground.
What you read is right. It depends on what you want to do with your application. If your service does something which should not be interrupted without explicit user-interaction you should start it as a foreground-service. This assures that the service won't get killed if more memory is needed by other applications. Also you have an ongoing notification displayed so that the user is aware of what is happening and you can provide functionality to your notification such as opening an activity when tapping on the notification etc. Examples for this may be a music player service or a download service. If you have a service which does not have to run necessarily after leaving the app you should choose a service started in background, so that the memory can be released if it is needed for other tasks. Some more information you can find here: http://developer.android.com/reference/android/app/Service.html