How to unbind a service when the application is destroyed

Question

I want to start a service when the users open my application, some of my activities need to bind the service, and when the users close my application, I stop the service.

The question is where can I stop the service. I want my service work when my app is open.

I start the service in Application.onCreate() method, and I found there is no onDestroy() method in Application.

And I tried stop it in the launcher activity onDestroy, but I don't think this is a good way because the system will recovery launcher activity when low memory.

Answer 1

What if you started and stopped your service based on running activities count? Here's an example.

public class MyApplication extends Application implements Application.ActivityLifecycleCallbacks {

    private int startedActivitiesCount = 0;

    @Override
    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(this);
    }

    private void onAppStart() {
        // Start service
    }

    private void onAppQuit() {
        // Stop service
    }

    @Override
    public void onActivityCreated(Activity activity, Bundle bundle) {
        startedActivitiesCount++;
        if (startedActivitiesCount == 1) {
            onAppStart();
        }
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
        startedActivitiesCount--;
        if (startedActivitiesCount == 0) {
            onAppQuit();
        }
    }

    @Override
    public void onActivityStarted(Activity activity) {
    }

    @Override
    public void onActivityResumed(Activity activity) {
    }

    @Override
    public void onActivityPaused(Activity activity) {
    }

    @Override
    public void onActivityStopped(Activity activity) {
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
    }

}