CODEWITHSUNDEEP
android
Karim Benfaida
Karim Benfaida

Reputation: 45

(Android) How to run multiple instances of a service

anyone knows how i can make multiple instances of same service class work seperately, am working on a taxi meter app where i have a "Counter" service which will calculate for me the distance and add locations to database for each client, in my mainactivity i made three instance of the same service and started everyone seperately but it doesn't seem to work as expected(only i made a toast in every service start action but it seem to appear for just one client). i know i have read in several treads that it's no possible to make multiple instance of services work at the same time but this is the only way i could do to make a taxi meter that supports multi clients at the same thing.

Upvotes: 3

Views: 2246

Answers (1)

Parth Kapoor
Parth Kapoor

Reputation: 1504

As rightly pointed out, we cannot have multiple instances of service. A service can only have one instance. Each subsequent call to startService, the method onStartCommand is called again.

But,suppose the onStartCommand instantiates a Timer object to repeat a task every 30 secs. Each subsequent call to startService, a new instance of object Timer is created...!

Now concider following use case:

  1. timer is set up to log "Hello World" after every 30 sec

  2. 1st startService command is issued at 16:00:00

  3. for next 2 mins, you should see 5 "Hello World" printed at

-16:00:00

-16:00:30

-16:01:00

-16:01:30

-16:02:00

  1. Now 2nd startService command is issued at 16:02:10, for next 2 mins, you should see "Hello World" printed as follows:

-16:02:10 (2nd call)

-16:02:30 (1st call)

-16:02:40 (2nd call)

-16:03:00 (1st call)

-16:03:10 (...)

-16:03:30

-16:03:40

-16:04:00

So after 2nd call, two instances of the Timer class exist. But only one Service instance.

Upvotes: 1

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