During my recent project, I utilized the Retrofit library in my App to efficiently handle file uploads alongside additional data fields. While implementing this functionality, I encountered some challenges that I want to share with you.
I would like to begin with Retrofit library, Retrofit is a popular Android library used for making HTTP requests and handling RESTful APIs effortlessly. It simplifies the process of network communication by converting HTTP endpoints into Java interfaces with annotation-based configuration.
Consider we have to implement a code to upload file on server using Java Firstly we need to create a Retrofit client. Create a java file named “UploadFileInstance” : —
public class UploadFileInstance {
public static String BASE_URL_UPLOAD = "https://xyz.com/";
static Retrofit getRetrofit() {
HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(loggingInterceptor)
.build();
return new Retrofit.Builder()
.client(client)
.baseUrl(UploadFileInstance.BASE_URL_UPLOAD)
.addConverterFactory(ScalarsConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.build();
}
}
This class returns Retrofit client
Assume we send content-type and size along with file. Now, create an interface named “UploadFileInterface”