Complete tutorial of how to add OkHttp Interceptor for Retrofit2 request. Examples for HttpLogginginterceptor, modiying request/response headers
Learn how to upload images/file on Android using Multipart with Retrofit2. Android Image Upload is explained step by step here with a good example
Learn how to Download file on Android using DonwloadManager. This DownloadManager Example gives a step by step tutorial to download file in your app
Simple step by step tutorial to send a HTTP GET network request on Android using Retrofit library
Complete example of implementing a custom request in android with Volley with a java object as response.Automatic gson parsing of the response
Android Volley Library tutorial with examples. HTTP GET, POST requests along with custom headers explained with code.