Retrofit Simple text show

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.1"
    defaultConfig {
        applicationId "net.androidsquad.retrofitapp"
        minSdkVersion 26
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    // Retrofit
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'

    // Converter for retrofit : GSON
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'


}

Xml:- 

<TextView
    android:id="@+id/textview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="36sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />




Model Class :-

package net.androidsquad.retrofitapp;

import com.google.gson.annotations.SerializedName;

public class DataModel {

    // This class will be as a template for the data that we are going to parse

    private int userId;

    private int id;

    private String title;

    private boolean completed;



    // Getters
    public int getUserId() {
        return userId;
    }

    public int getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public boolean isCompleted() {
        return completed;
    }
}




MainActivity :-


package net.androidsquad.retrofitapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    TextView txt;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        txt = findViewById(R.id.textview);

        // Retrofit Builder
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://run.mocky.io/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        // instance for interface
        MyAPICall myAPICall = retrofit.create(MyAPICall.class);
        Call<DataModel> call = myAPICall.getData();

        call.enqueue(new Callback<DataModel>() {
            @Override
            public void onResponse(Call<DataModel> call, Response<DataModel> response) {

                // Checking for the response
                if (response.code() != 200 ){
                    txt.setText("Check the connection");
                    return;
                }


                // Get the data into textview
                String jsony = "";
                jsony = "ID= " + response.body().getId() +
                        "\nuserId= "+response.body().getUserId() +
                        "\ntitle= " +response.body().getTitle() +
                        "\nCompleted= " +response.body().isCompleted();

                txt.append(jsony);


            }

            @Override
            public void onFailure(Call<DataModel> call, Throwable t) {

            }
        });













    }
}




Interface :-
package net.androidsquad.retrofitapp;

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

public interface MyAPICall {

    // https://run.mocky.io/      v3/90fea295-8b4d-4e7c-be1e-f0788188102f

    @GET("v3/90fea295-8b4d-4e7c-be1e-f0788188102f")
    Call<DataModel> getData();


}