Android: Binding to a remote service

I'm building a remote service and a client application targetted at API 24 executing on a Nexus 6P device. I have a remote service that automatically starts at boot. Here are the code fragments:

Remote Service Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="a.b.c">

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <receiver
            android:name=".MyBroadcastReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>

        <service android:name=".MyService" >
            <intent-filter>
                <action android:name="a.b.c.MY_INTENT" />
            </intent-filter>
        </service>

        <activity android:name=".MyActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

Remote Service

package a.b.c;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service
{
    @Override
    public IBinder onBind(Intent intent) {
        return null;
        // EDIT: see StackOverflow answers/comments below:
        // Returning an IBinder here solves the problem.
        // e.g. "return myMessenger.getBinder()" where myMessenger
        // is an instance of Android's Messenger class.
    }

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

Remote Broadcast Receiver

package a.b.c;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
            Intent serviceIntent = new Intent(context, MyService.class);
            context.startService(serviceIntent);
        }
    }
}

Remote Activity (Android Studio insists on there being an Activity)

package a.b.c;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class MyActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_activity);
    }
}

I then have a separate project to implement a client activity in a different package that attempts to bind to the remote service. Here are the code fragments:

Client Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="x.y.z">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ClientActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

Client Activity

package x.y.z;

import android.app.ActivityManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class ClientActivity extends AppCompatActivity
{
    private final String TAG = "ClientActivity";

    private ServiceConnection mMyServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d(TAG, "ServiceConnection onServiceConnected");
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d(TAG, "ServiceConnection onServiceDisconnected");
        }
    };

    private boolean isServiceRunning(String className) {
        ActivityManager manager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
        for (ActivityManager.RunningServiceInfo serviceInfo : manager.getRunningServices(Integer.MAX_VALUE)) {
            if (className.equals(serviceInfo.service.getClassName())) {
                return true;
            }
        }
        return false;
    }

    private void bindMyService() {
        Intent intent = new Intent("a.b.c.MY_INTENT");
        intent.setPackage("a.b.c");
        bindService(intent, mMyServiceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_client);
        if (isServiceRunning("a.b.c.MyService")) {
            bindMyService();
        }
        else {
            Log.e(TAG, "Service is not running");
        }
    }
}

The "isServiceRunning" function returns true so I know that a.b.c.MyService is running. The bindService function seems to succeed (no errors in Logcat) but the onServiceConnected callback is never executed.

How do I bind to a.b.c.Myservice from x.y.z.ClientActivity in Android target SDK 24?

Thanks!

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