Android Retrofit Example Java

We are Get data from https://reqres.in/api/users/2 this url

1/  Create A New Project and add Libarary.

dependencies {

    implementation libs.appcompat
    implementation libs.material
    implementation libs.activity
    implementation libs.constraintlayout
    testImplementation libs.junit
    androidTestImplementation libs.ext.junit
    androidTestImplementation libs.espresso.core

    implementation "com.squareup.retrofit2:converter-gson:2.8.1" //Add Library here 
    implementation "com.squareup.retrofit2:retrofit:2.9.0"
}

 

{
  "data": {
    "id": 2,
    "email": "janet.weaver@reqres.in",
    "first_name": "Janet",
    "last_name": "Weaver",
    "avatar": "https://reqres.in/img/faces/2-image.jpg"
  },
  "support": {
    "url": "https://reqres.in/#support-heading",
    "text": "To keep ReqRes free, contributions towards server costs are appreciated!"
  }
}


 

package com.example.retrofitexample;

public class User {
    private int id;
    private String first_name;
    private String last_name;
    private String email;
    private String avatar;

    public User(int id, String first_name, String last_name, String email, String avatar) {
        this.id = id;
        this.first_name = first_name;
        this.last_name = last_name;
        this.email = email;
        this.avatar = avatar;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAvatar() {
        return avatar;
    }

    public void setAvatar(String avatar) {
        this.avatar = avatar;
    }
}


 

package com.example.retrofitexample;

public class UserResponse {
    private User data;

    public UserResponse(User data) {
        this.data = data;
    }

    public User getData() {
        return data;
    }

    public void setData(User data) {
        this.data = data;
    }
}


 

package com.example.retrofitexample;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Path;

public interface RetrofitAPI {
    @GET("api/users/{id}")
    public Call<UserResponse> getUser(@Path("id") int id);
}

 

package com.example.retrofitexample;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {

    TextView email;
    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        email=findViewById(R.id.email);
        getData();
    }
    private void getData(){
        Retrofit retrofit = new Retrofit.Builder().baseUrl("https://reqres.in/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        RetrofitAPI retrofitAPI = retrofit.create(RetrofitAPI.class);
        Call<UserResponse> call = retrofitAPI.getUser(2);
        call.enqueue(new Callback<UserResponse>() {
            @Override
            public void onResponse(Call<UserResponse> call, Response<UserResponse> response) {
                email.setText(response.body().getData().getEmail()+"");
            }
            @Override
            public void onFailure(Call<UserResponse> call, Throwable t) {
                Toast.makeText(MainActivity.this, "Fail to get the data..", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

 

Run code then see output.