Using Retrofit to upload file and some data on server in Android App.
<p>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.</p>
<p>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.</p>
<p>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 “<strong>UploadFileInstance</strong>” : —</p>
<pre>
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();
}
}</pre>
<p>This class returns Retrofit client</p>
<p>Assume we send <strong>content-type</strong> and <strong>size</strong> along with file. Now, create an interface named <strong>“UploadFileInterface”</strong></p>
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