AIDL Callback Registration Issue - Query Regarding Android Documentation

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1

I’m trying to follow the Android documentation to create an AIDL service but I am facing issues with the callback methods. Whenever I try to implement it, I encounter an error that states, “The method registerCallback(IRemoteInterface) is undefined for the type IRemoteInterface.”

I have gone through several tutorials, but none mention this registerCallback method, leaving me puzzled as to why it’s not functioning for me and why it’s absent in other resources.

I suspect my confusion arises from a lack of understanding of how services utilize callbacks to relay information to the components they are connected to.

Here’s the AIDL interface I’m working with:

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();
}

Upon trying to include these callback methods in my AIDL file, I receive syntax errors:

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

I’ve also cleaned and rebuilt my workspace, but the issue persists. Might this be tied to the generated files not updating correctly?

2

I encountered a similar problem while working with AIDL callbacks. It appears you’re missing the definition of IRemoteServiceCallback which is essential for your callback methods. To resolve this, ensure you create a new AIDL file named IRemoteServiceCallback.aidl in the same package directory where your main AIDL file is located. This new file should contain the methods you want to use for callbacks. Once defined, remember to import this interface into your main AIDL file. The reason you might not be seeing the registerCallback methods could be because the stub files generated do not include these by default unless explicitly stated in your AIDL definition. This is a common oversight in many guides.

3

u missed defining the IRemoteServiceCallback interface. just make a new .aidl file for it and import it in your main file. ensure it’s in the same package, or the stub won’t find it. this is a common mistake ppl make.

4

Those syntax errors usually occur when the AIDL compiler can’t locate your callback interface. To fix this, ensure you include the import statement in your main AIDL file, even if both files reside in the same package; without it, the generated stub classes may not incorporate your callback methods correctly. Additionally, if your callback interface methods are void, employing the ‘oneway’ keyword can prevent them from blocking the calling thread. Finally, it’s not uncommon for build systems to overlook AIDL modifications, so try invalidating caches and restarting your IDE.