I have integrated RESTful APIs and WebSocket technology into Android applications. For instance, in the Penske supply chain insight application, I utilized RESTful APIs to facilitate efficient communication with backend services. 

Using Retrofit and the OkHttp client, I implemented network calls, employing methods such as GET, POST, and PUT for various operations. I set up logging interceptors to capture request and response bodies, and I used caching interceptors to manage request and response caching. Additionally, I added headers as needed to ensure secure and efficient communication.

I also employed WebSocket for real-time data updates, enabling two-way communication between the client and server. In the Penske app, we achieved real-time tracking of loads and orders through WebSocket, allowing both the client and server to send and receive data seamlessly.

Through these methods, I have ensured efficient and reliable communication between the app and backend services.