kotlin_android_retrofit_github_api_async_request_quickstart.kt

1import retrofit2.Retrofit
2import retrofit2.converter.gson.GsonConverterFactory
3import retrofit2.http.GET
4import retrofit2.http.Path
5import retrofit2.Call
6import retrofit2.Callback
7import retrofit2.Response
8
9// Data class representing the API response
10data class Contributor(val login: String, val contributions: Int)
11
12// Interface defining the API endpoints
13interface GitHubService {
14    @GET("repos/{owner}/{repo}/contributors")
15    fun contributors(
16        @Path("owner") owner: String,
17        @Path("repo") repo: String
18    ): Call<List<Contributor>>
19}
20
21fun main() {
22    // 1. Create the Retrofit instance
23    val retrofit = Retrofit.Builder()
24        .baseUrl("https://api.github.com/")
25        .addConverterFactory(GsonConverterFactory.create())
26        .build()
27
28    // 2. Create an instance of our GitHubService interface
29    val service = retrofit.create(GitHubService::class.java)
30
31    // 3. Create a call to the contributors endpoint
32    val call = service.contributors("square", "retrofit")
33
34    // 4. Execute the call asynchronously
35    call.enqueue(object : Callback<List<Contributor>> {
36        override fun onResponse(call: Call<List<Contributor>>, response: Response<List<Contributor>>) {
37            if (response.isSuccessful) {
38                val contributors = response.body()
39                contributors?.forEach {
40                    println("${it.login} (${it.contributions})")
41                }
42            }
43        }
44
45        override fun onFailure(call: Call<List<Contributor>>, t: Throwable) {
46            t.printStackTrace()
47        }
48    })
49}