I’m going to show an basic example on usage of Retrofit. Retrofit lets you amazing simple and clean GET and POST methods. You do not need long and complex asynchronous task in Android anymore :O
1. ApiInterface
First we need to create an interface which names it as ApiInterface.
public interface ApiInterface {
@GET("user/{Id}")
Call<List<User>> userData(@Path("Id") String Id);
}
2. ApiClient
Second, we need to create an ApiClient class to determine our BASE URL.
public class ApiClient {
public final static String BASE_URL = "https://api.github.com/";
private static Retrofit retrofit = null;
public static Retrofit getClient(){
if(retrofit == null){
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
3. Get Data from Server
Now, we will send the specific user id from the server to get its data.
Firstly, we use our ApiInterface to create an ApiClient service. After that, we have to use “Call” class to receive data from server and we will enqueue its call to use that data. in “onResponse” part. There is also an onFailure method to check your server and link works totally correct.
public void getData(){
// sends the user id
String user_id = "69";
ApiInterface apiService =
ApiClient.getClient().create(ApiInterface.class);
Call<List<User> > call =
apiService.userData(user_id);
call.enqueue(new Callback<List<User>>() {
@Override
public void onResponse(Call<List<User>> call, Response<List<User>> response) {
List<User> userInfo = response.body();
for(int i = 0; i<userInfo.size(); i++){
// Magic here
}
}
@Override
public void onFailure(Call<List<Junction>> call, Throwable t) {
Log.e("MyApp", "getData ERROR :" + t.toString());
}
});
}
After using asynchronous task to use @GET and @POST methods, Retrofit is the new cure for me :) I’m a bit late to learn Retrofit but better than never :P
