My activity starts a Service, and when I close my app, the service continues to run. OK, that's right. But when I open my application again, in the activity, I need to know the value of a public variable defined on the running Service(class) that I've started previously.
How can I do that?
Thanks
If you are binding your Activity to the Service, you should have an implementation of the Binder interface in your Service, e.g.
public class ServiceBinder extends Binder {
public MyService getService() {
return MyService.this;
}
}
In your Activity, create a new ServiceConnection class which will be used to give you access to your Service:
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
mMyService = ((MyService.ServiceBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
mMyService = null;
}
};
Here the member variable mMyService will give you access to all public members of your Service class.
To create the connection, implement doBindService and doUnbindService in your Activity:
void doBindService() {
bindService(new Intent(this, MyService.class), mConnection, Context.BIND_AUTO_CREATE);
}
void doUnbindService() {
// Detach our existing connection.
unbindService(mConnection);
}
Hope this helps!
If you don't call unbindService, your activity still have connection to service and you can simply check the variable through the service's method.
You could use messenger. As per android website
A messenger is reference to a Handler, which others can use to send messages to it. This allows for the implementation of message-based communication across processes, by creating a Messenger pointing to a Handler in one process, and handing that Messenger to another process.
