HyperTrack Android <> REST API network call. Steps: build.gradle > RetrofitServiceGenerator.java > RetrofitService.java > NearbyUser.java

build.gradle

dependencies {
    ...
    //Add retrofit library for network calls
    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    ...
}

NearbyUser.java

//For nearby API you can pass actionId or latlng. For more info on nearbyAPI https://docs.hypertrack.com/api/entities/user.html#list-nearby-users
public void getNearbyUsers(String actionId, Latlng latlng){
  //Create retrofit service object
  RetrofitService getNearbyUserService = RetrofitServiceGenerator.createService(RetrofitService.class,context);
  Call<UserListResponse> call = getNearbyUserService.getNearByUsers(actionID,latLng.latitude +","+latLng.longitude);
        call.enqueue(new Callback<UserListResponse>() {
            @Override
            public void onResponse(Call<UserListResponse> call, Response<UserListResponse> response) {
                if(response.isSuccessful()){
                    if(response.body() != null){
                        List<User> userList = response.body().getResults();
                        Log.d(TAG, "onResponse: "+userList);
                    }
                }
                else {
                    Toast.makeText(context, "Error Occurred: "+response.code(), Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<UserListResponse> call, Throwable t) {
                Toast.makeText(context, "Error Occurred: ", Toast.LENGTH_SHORT).show();
                Log.e(TAG, "onFailure: ", t);
            }
        });
}

RetrofitService.java

package io.hypertrack.sendeta.network.retrofit;

import com.hypertrack.lib.models.User;

import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.POST;
import retrofit2.http.Path;

/**
 * Created by Aman Jain on 07/12/17.
 */
public interface RetrofitService {

    // Nearby API https://docs.hypertrack.com/api/entities/user.html#list-nearby-users
    @GET("users/nearby/")
    Call<UserListResponse> getNearByUsers(@Query("action_id") String action_id, @Query("location") String latLng);
}

RetrofitServiceGenerator.java

package io.hypertrack.sendeta.network.retrofit;

import android.content.Context;

import com.hypertrack.lib.internal.common.util.Utils;

import java.io.IOException;
import java.util.TimeZone;

import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * Created by Aman Jain on 07/12/17.
 */
public class RetrofitServiceGenerator {

    public static final String API_BASE_URL = "https://api.hypertrack.com/api/v1/";
    private static final String TAG = RetrofitServiceGenerator.class.getSimpleName();
    private static Context mContext;

    private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

    private static Retrofit.Builder builder =
            new Retrofit.Builder()
                    .baseUrl(API_BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create());

    public static <S> S createService(Class<S> serviceClass, Context context) {
        mContext = context;
        httpClient.interceptors().add(new Interceptor() {
            @Override
            public Response intercept(Interceptor.Chain chain) throws IOException {
                Request original = chain.request();

                // Request customization: add request headers
                Request.Builder requestBuilder = original.newBuilder()
                        .header("Authorization", "Token " + BuildConfig.HYPERTRACK_PK)
                        .header("User-Agent", "hypertrack-live-android")
                        .header("timezone", TimeZone.getDefault().getID())
                        .header("Device-id", Utils.getDeviceId(mContext))
                        .header("app-id", mContext.getPackageName())
                        .method(original.method(), original.body());

                Request request = requestBuilder.build();
                return chain.proceed(request);
            }
        });

        OkHttpClient client = httpClient.build();
        Retrofit retrofit = builder.client(client).build();
        return retrofit.create(serviceClass);
    }
}