I need help using Jsoup to display the html from a website - html

Question

very new to coding, using Java writing android application. I have included my code to this point below. At this point I am just trying to get the HTML from a website. I have been googling my way to this point. I do have <uses-permission android:name="android.permission.INTERNET" />in the manifest. I call the code to get the html in the oncreate event (new URLParser). At first I tried to view the html in the logcat, the code is still there for that in the onPostExecute event. The program ran fine this way, but the html did not show up in the verbose section of the logcat. So I added a temporary button and text view to the application. The button's onClick is set to call "showHTML". The app loads up, and when I press the button it crashes. So I cannot seem to see the html in the logcat, or the textview after pressing the button.
package com.example.brewerycruiser;
import androidx.appcompat.app.AppCompatActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import java.io.IOException;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new URLParser();
}
public void showHTML (View view) {
TextView HTMLview =
view.getRootView().findViewById(R.id.textView);
HTMLview.setText(doc.toString());
}
Document doc = null;
public class URLParser extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
try {
doc = Jsoup.connect("https://www.coloradobrewerylist.com/brewery/").userAgent("Mozilla/5.0").get();
} catch (IOException ex) {
ex.printStackTrace();
}
return null;
}
protected void onPostExecute(Void result) {
Log.v("DATA", doc.toString());
}
}
}
The error log is below:
11-19 18:09:32.779 18293-18293/com.example.brewerycruiser E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.brewerycruiser, PID: 18293
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
at android.view.View.performClick(View.java:5225)
at android.view.View$PerformClick.run(View.java:21195)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5451)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:5225) 
at android.view.View$PerformClick.run(View.java:21195) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5451) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.jsoup.nodes.Document.toString()' on a null object reference
at com.example.brewerycruiser.MainActivity.showHTML(MainActivity.java:27)
at java.lang.reflect.Method.invoke(Native Method) 
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397) 
at android.view.View.performClick(View.java:5225) 
at android.view.View$PerformClick.run(View.java:21195) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5451) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Any help is greatly appreciated,
Thank you