public class ActivityWithoutServiceConnector extends Activity {

    //remote service interface
    private IEchoService mEchoService;

    /**
     * Service connection that gets call back when service is connected
     */
    private ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder service) {
            //get the service 
            mEchoService = IEchoService.Stub.asInterface(service);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mEchoService = null;
        }
    };


    /**
     * Connect with the remote service
     */
    private void conectWithService() {
        Intent serviceIntent = new Intent("util.serviceconnector.ECHO_SERVICE");
        serviceIntent.setComponent(new ComponentName("util.serviceconnector.service", "util.serviceconnector.service.EchoService"));
        startService(serviceIntent);
        bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        conectWithService();
    }

}

public class ActivityWithServiceConnector extends Activity {

    @ServiceInfo(serviceIntent = "util.serviceconnector.ECHO_SERVICE")
    private IEchoService mEchoService;

    @ServiceConnectionCallback
    public void onServiceConnectionChanged(String serviceIntent, boolean connected) throws RemoteException {
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        ServiceConnector.bind(this, this);
    }
}

dependencies {
  compile 'com.josesamuel:serviceconnector:1.0.6'
}

Copyright 2018 Joseph Samuel

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.