public class ServiceAbility extends Ability {

    // 实现 RemoteAgentStub 接口
    RemoteAgentStub remoteAgentStub = new RemoteAgentStub("service") {
        @Override
        public int plus(int numA, int numB) throws RemoteException {
            return numA + numB;
        }
    };

    // 向客户端公开 RemoteAbilityStub 接口
    @Override
    public IRemoteObject onConnect(Intent intent) {
        return remoteAgentStub.asObject();
    }
}

IRemoteAgent proxy;

IAbilityConnection connection = new IAbilityConnection() {
    @Override
    public void onAbilityConnectDone(ElementName elementName, IRemoteObject iRemoteObject, int i) {
        proxy = RemoteAgentStub.asInterface(iRemoteObject);
    }

    @Override
    public void onAbilityDisconnectDone(ElementName elementName, int i) {
        proxy = null;
    }
};