How to fix android.os.NetworkOnMainThreadException Error by creating new Thread in Android Code?

In this video it shows the fix for android.os.NetworkOnMainThreadException error. It creates a new thread in the Android code to fix this error.

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Complete source code and other details/ steps of this video are posted in the below link:
https://programmerworld.co/android/how-to-fix-android-os-networkonmainthreadexception-error-by-creating-new-thread-in-your-android-studio-code/


However, the main Java code is copied below also for reference:

package com.programmerworld.fixnetworkonmainthreaderror;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

private ImageView imageView;
private TextView textView;

private URL url;
private Bitmap bitmap;

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

imageView = findViewById(R.id.imageView);
textView = findViewById(R.id.textView);

try {
url = new URL("https://i0.wp.com/programmerworld.co/wp-content/uploads/2023/05/flower.png?w=977&ssl=1");
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}

public void buttonError(View view){
try {
bitmap = BitmapFactory.decodeStream(url.openStream());
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
textView.setText(e.toString());
imageView.setImageBitmap(null);
}
}
public void buttonResolution(View view){
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {
bitmap = BitmapFactory.decodeStream(url.openStream());
} catch (Exception e) {
textView.setText(e.toString());
}
}
});
thread.start();
while (thread.isAlive()){
textView.setText("Thread is processing the request");
}
imageView.setImageBitmap(bitmap);
textView.setText("SUCCESS");
}
}


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