Is it possible to create on Delphi my own accessibility service?

[Ranja AZ 2]

I need to intercepte USSD response in Android. Following link https://newbedev.com/prevent-ussd-dialog-and-read-ussd-response example written by Java, I need to create the same in Delphi but I have no idea.

 

Else, Is there anyone who has experience on using TelephonyManager.UssdResponseCallback. (https://developer.android.com/reference/android/telephony/TelephonyManager.UssdResponseCallback)?

 

Can help?

 

Thanks

[Dave Nottage 557]

This looks like two questions. The first part is not currently possible using Delphi code, since there's no option to use AccessibilityService (there is for a plain Service and JobIntentService)

In order to use UssdResponseCallback you need to write Java code, since you need to create a descendant of it (this is otherwise not currently possible in Delphi), and override its methods. You could define a Java interface that the descendant takes as a parameter in its constructor, and uses to redirect the overridden methods, much like I have in the code here: https://github.com/DelphiWorlds/Kastri/tree/master/Java/Base/Connectivity
 

This Java code would need to be compiled into a jar which the Delphi app can consume. You would need to import the Java code into Delphi code. Using the same example above, this is the corresponding Delphi import: https://github.com/DelphiWorlds/Kastri/blob/master/API/DW.Androidapi.JNI.DWNetworkCallback.pas

The next step is to construct a class that implements the interface defined earlier. Following the same example, that is TNetworkCallbackDelegate in this unit: https://github.com/DelphiWorlds/Kastri/blob/master/Features/Connectivity/DW.Connectivity.Android.pas

You would then create an instance of the "delegate", and pass a reference to that when creating an instance of the descendant. Again following the above example, it would be similar to the code here: https://github.com/DelphiWorlds/Kastri/blob/82da3db3d0a526f6e93a30f3eb1a6c14779399bb/Features/Connectivity/DW.Connectivity.Android.pas#L98

 

[Ranja AZ 2]

Dave Nottage, thanks you again for your response!

I'll try it!

 

Regard