public class ServiceA extends Service {


  private static final String TAG = ServiceA.class.getSimpleName();
  MyBinder mBinder;
  MyServiceConnection mServiceConnection;
  PendingIntent mPendingIntent;

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

    if(mBinder==null)
    {
      mBinder=new MyBinder();
    }
    mServiceConnection=new MyServiceConnection();
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);
    mPendingIntent=PendingIntent.getService(this,0,intent,0);
    Notification.Builder builder=new Notification.Builder(this);
    builder.setTicker("守护服务A启动中")
        .setContentText("我是来守护服务B的")
        .setContentTitle("守护服务A")
        .setSmallIcon(R.mipmap.ic_launcher)
        .setContentIntent(mPendingIntent)
        .setWhen(System.currentTimeMillis());
    Notification notification=builder.build();

    startForeground(startId,notification);


    return START_STICKY;
  }

  @Override
  public IBinder onBind(Intent intent) {
    return mBinder;
  }

  public class MyBinder extends IBridgeInterface.Stub {

    @Override
    public String getName() throws RemoteException {
      return "name:"+TAG;
    }
  }

  class MyServiceConnection implements ServiceConnection {

    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
      String name=null;
      try {
        name= IBridgeInterface.Stub.asInterface(iBinder).getName();
      } catch (RemoteException e) {
        e.printStackTrace();
      }


      Toast.makeText(ServiceA.this,name+"连接成功",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
      Toast.makeText(ServiceA.this,TAG+"断开连接",Toast.LENGTH_SHORT).show();

      ServiceA.this.startService(new Intent(ServiceA.this,ServiceB.class));

      ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);

    }
  }


}

public class ServiceB extends Service {

  private static final String TAG = ServiceB.class.getSimpleName();
  private PendingIntent mPendingIntent;
  private MyBinder mBinder;
  private MyServiceConnection mServiceConnection;

  @Override
  public IBinder onBind(Intent intent) {
    return mBinder;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    if (mBinder == null) {
      mBinder = new MyBinder();
    }

    mServiceConnection = new MyServiceConnection();
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);
    mPendingIntent = PendingIntent.getService(this, 0, intent, 0);
    Notification.Builder builder = new Notification.Builder(this);

    builder.setTicker("守护服务B启动中")
        .setContentText("我是来守护服务A的")
        .setContentTitle("守护服务B")
        .setSmallIcon(R.mipmap.ic_launcher)
        .setContentIntent(mPendingIntent)
        .setWhen(System.currentTimeMillis());
    Notification notification = builder.build();
    startForeground(startId, notification);

    return START_STICKY;
  }

  public class MyBinder extends IBridgeInterface.Stub {

    @Override
    public String getName() throws RemoteException {
      return "name:"+TAG;
    }
  }

  class MyServiceConnection implements ServiceConnection {

    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
      String name=null;
      try {
        name=IBridgeInterface.Stub.asInterface(iBinder).getName();
      } catch (RemoteException e) {
        e.printStackTrace();
      }
      Toast.makeText(ServiceB.this, name + "连接成功", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
      Toast.makeText(ServiceB.this, TAG + "断开连接", Toast.LENGTH_SHORT).show();

      ServiceB.this.startService(new Intent(ServiceB.this, ServiceA.class));
      ServiceB.this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);
    }
  }


}

1 interface IBridgeInterface {
2   String getName();
3 }

public class MainActivity extends Activity {


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    startService(new Intent(this, ServiceA.class));
    startService(new Intent(this, ServiceB.class));
  }

}

<service android:name=".services.ServiceA" />
    <service
      android:name=".services.ServiceB"
       android:process=":remote" />