How to call Android Service methods from Activity?

This is a re-post of an answer I wrote on Stackoverflow

Forget everything you know and answer this question.

How do you call a normal Java class method?

A obj = new A();
obj.method();

Service is a Java class. So how would you call a service method?

serviceObj.method();

Now the real question is how do you create a Service object?

Service serviceObj = new Service();

Definitely not.

In Android, Service is a System component which is created, destroyed and managed by Android OS.
For creating a service object we need IBinder.

This is the flow of getting a service object from IBinder.

Once you have a hold of serviceObject. It will work like any normal Java object.
The thing explained above in the figure is called Binding a Service.

Binding makes it possible to observe a background service from an Activity. With binding, we can communicate in both ways

ie Activity< — —>Service.

Few things to keep in mind

• Never forget to unbind the service else you will lead to ResourceLeak.
• You can call startService(intent) and bindService(mIntent, mConnection, BIND_AUTO_CREATE) in any order. Binding and Starting a service are two independent things.

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