Json parsing using Retrofit in Android

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.3"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

plugins {
    id 'com.android.application'
}

android {
    compileSdk 30

    defaultConfig {
        applicationId "tech.softbinarycrunch.retrofit"
        minSdk 21
        targetSdk 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
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
    implementation 'androidx.navigation:navigation-fragment:2.3.5'
    implementation 'androidx.navigation:navigation-ui:2.3.5'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'
}

package tech.softbinarycrunch.retrofit;

import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.scalars.ScalarsConverterFactory;

public class MainActivity extends AppCompatActivity {
    RelativeLayout rl;LinearLayout ll;EditText et1,et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         rl=new RelativeLayout(getApplicationContext());
        RelativeLayout.LayoutParams rlp=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT);
        rl.setLayoutParams(rlp);
         ll=new LinearLayout(getApplicationContext());
        LinearLayout.LayoutParams llp=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
        ll.setLayoutParams(llp);
        ll.setGravity(Gravity.CENTER);
        ll.setOrientation(LinearLayout.VERTICAL);
         et=new EditText(getApplicationContext());
        et.setHint("user name");
        ll.addView(et);
         et1=new EditText(getApplicationContext());
        et1.setHint("password");
        ll.addView(et1);
        rl.addView(ll);
        Button bt=new Button(getApplicationContext());
        bt.setText("ok");
        ll.addView(bt);
        setContentView(rl);
        listener(bt,et.getText().toString(),et1.getText().toString(),rl);

    }
    private void message(String s){
        new Handler(getApplicationContext().getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
            }
        });
    }
    private void listener(Button bt,String s1,String s2,RelativeLayout rl){
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(et.getText().toString().length()==0){
                    message("user name is empty");
                    return ;
                }
                if(et1.getText().toString().length()==0){
                    message("passwword is empty");
                    return;
                }
                loginUser(s1,s2,rl);
            }
        });
    }
    private void loginUser(String s1,String s2,RelativeLayout rl) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(PostInterface.JSONURL)
                .addConverterFactory(ScalarsConverterFactory.create())
                .build();

        PostInterface api = retrofit.create(PostInterface.class);

        Call<String> call = api.getUserLogin(s1,s2,"[email protected]");

        call.enqueue(new Callback<String>() {
            @Override
            public void onResponse(Call<String> call, Response<String> response) {
                Log.i("Responsestring", response.body().toString());
                //Toast.makeText()
                if (response.isSuccessful()) {
                    if (response.body() != null) {
                        Log.i("onSuccess", response.body().toString());

                        String jsonresponse = response.body().toString();
                        parseLoginData(jsonresponse);
                    } else {
                        Log.i("onEmptyResponse", "Returned empty response");
                    }
                }
            }

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

            }
        });

    }
    public void parseLoginData(String response) {
System.out.println("response"+response);
        try {
            JSONObject jsonObject = new JSONObject(response);

            gridlauout(jsonObject);

            /*if (jsonObject.getString("status").equals("true")) {

                JSONArray dataArray = jsonObject.getJSONArray("data");
                for (int i = 0; i < dataArray.length(); i++) {


                }

            }*/

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }
    private void gridlauout(JSONObject jsonObject){
        GridLayout gridLayout=new GridLayout(getApplicationContext());
        gridLayout.setColumnCount(2);
        gridLayout.setRowCount(jsonObject.length());
        gridLayout.setAlignmentMode(GridLayout.ALIGN_BOUNDS);
        for(int i=0;i<jsonObject.length();i++){
            Button bt=new Button(getApplicationContext());
            Button btt=new Button(getApplicationContext());
            try {
                btt.setText("response");
                bt.setText(jsonObject.getString("response"));
            }
            catch (Exception e){
                e.printStackTrace();
            }
            gridLayout.addView(btt);
            gridLayout.addView(bt);
        }
        ll.addView(gridLayout);
    }
}