package com.example.androidapp1;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;
import java.util.concurrent.Executors;
import java.util.function.Consumer;
import java.util.stream.Collectors;

public class MyUtils {

     public static void SendHttpRequest(String httpPath, String method, String requestType, Consumer<String> myMethodWhenHttpFinished)
     {
          // create my thread
          Executors.newSingleThreadExecutor().execute(new Runnable() {
               @Override public void run() {

                    try {
                         URL url = new URI(httpPath).toURL();
                         HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                         connection.setRequestMethod(method);
                         connection.setRequestProperty("Accept", requestType);
                         connection.setRequestProperty("Content-Type", requestType);

                         if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                              BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                              String htmlOrJson = reader.lines().collect(Collectors.joining("\n"));
                              myMethodWhenHttpFinished.accept(htmlOrJson);
                         }
                    }
                    catch (Exception e) {
                         myMethodWhenHttpFinished.accept(null);
                    }

               }
          });
     }

}

package com.example.androidapp1;

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

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

          // send http
          MyUtils.SendHttpRequest("https://dir.by/developer",
               "GET",
               "application/html",
               (httpResponse) -> {

                    // main thread
                    new Handler(Looper.getMainLooper()).post(() -> {

                         // set text
                         TextView myElement = this.findViewById(R.id.my_element1);
                         if (myElement!=null)
                              myElement.setText(httpResponse);
               });
          });
     }

}