AIDL file extension

This file is the Android Interface Definition Language file that is used to enable multi-application communication in Android OS. The file includes Java programming language which specifies an interface using one or several methods and the interface declaration statement, an import statement for every information type, and code comments. AIDL is an implementation of the Interprocess Communication (IPC) protocol which is provided by Android and enables one program to communicate with another application that is running in another process. AIDL files should be saved in the /src/ folder of the project.