AIDL registerCallback() google docs

Question

google docs have a tutorial on how to make an AIDL service. However, when I tried to do the same, I got an error "The method registerCallback(IRemoteInterface) is undefined for the type IRemoteInterface.

I have not seen this "registerCallback" method in any tutorial that I have been googling and my question is why is this not working/why do other places not use it?

I feel like part of my issue is a fundamental misunderstanding about services and their 'callback' to send information to what it is bound to it. Thanks!

AIDL:

package com.mine.ben;

import com.mine.servicenexus.RelPoint;


interface IRemoteInterface {

    Location getLastLocation();
    RelPoint getRelPoint();
    int logControlActivity(in String text,in int severity);
    int getRunningStatus();
}

Updated question: I get a syntax error in my AIDL file when i add

void registerCallback(IRemoteServiceCallback);
void unregisterCallback(IRemoteServiceCallback);

I have cleaned my workspace and it builds automatically. Is this a problem with the gen file?

Answer 1

Few lines from my application:

interface IGpsService {
    Bundle getNavigationMessage();
    void resetStatistics();
    void recordingEnable(boolean recordingEnabled, boolean continueLastTrack);
    void registerCallback(IGpsChanged cb);
    void unregisterCallback(IGpsChanged cb);
    boolean isRecordingEnabled();
    void setGhost(int trackId);
    void startGhost();
    void sendUserEvent(int eventId);
}

second file for calback interface itself:

interface IGpsChanged{
oneway void onLocationChanged(out Bundle message);
}

Best of all - usually you do not need those .aidl definitions. This is necessary only when exposing service methods outside of the application.

It's also helpful to understand how it works - forst aidl defines basic service's methods. registerCallback is not a "special" method, it's as oridinary as any other, just enables defining callbacks for two-way communication (in this particular case - to send some position info from sesrvice to binded activity (or other component).

As you mentioned in comment - you do not want to create service, just consume some service from outside of application. In that case you need those external aidl file, not the one written by you. Stubs for consuming service's method will be generated in the /gen directory.