How to fix WebView app giving "App Keeps Stopping" error after installing?

I have a web view app that works perfectly fine on most android phones, but while testing, some said that the app even won't open for the first time after installation.

It keeps on showing the error as below : "Keeps Stopping"

And in some mobile devices, it says "Runtime Exception" and crashes without even opening.

This was a debug APK, so in an attempt of trying to fix it, I even generated a signed APK. Still no luck.

Here is my whole Code:

Activity Main.XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<WebView
    android:layout_width="match_parent"
    android:id="@+id/webviewid"
    android:layout_height="match_parent"
    android:overScrollMode="never"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent">
</WebView>
</RelativeLayout>

AndroidManifest.Xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xxxxxxxxxxxxx;">
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" ></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" ></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_roundffd"
        android:supportsRtl="true"
        android:theme="@style/Theme_xxxxxx"
       android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize">
        <activity
            android:name=".MainActivity"
            android:windowSoftInputMode="adjustResize"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Mainactivity.java

package com.xxxxxxxxxxxxx;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.accessibilityservice.AccessibilityService;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import android.os.Handler;
import android.webkit.GeolocationPermissions;
import android.webkit.WebChromeClient;
import android.content.Context;
import android.net.ConnectivityManager;

public class MainActivity extends AppCompatActivity {
    private WebView webView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webView = findViewById(R.id.webviewid);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("https://www.some.com/");
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setGeolocationEnabled(true);
        webView.setWebChromeClient(new WebChromeClient() {
            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
                callback.invoke(origin, true, false);
            }
        });
    }

// On double back press stuff starts --------------------------------------------------
    private boolean doubleBackToExitPressedOnce = false;
    @Override
    protected void onResume() {
        super.onResume();
        // .... other stuff in my onResume ....
        this.doubleBackToExitPressedOnce = false;
    }
    @Override
    public void onBackPressed() {
        if (doubleBackToExitPressedOnce) {
            super.onBackPressed();
            return;
        }
        if(webView.canGoBack()){
            webView.goBack();
        }
}
}

Please note that the app works completely fine, It installs and opens with no issues, but when it comes to some phones, I am getting this "Keeps Stopping" error.

As per some blogs, I even tried uninstalling updates from the Android Web View setting, yet still no use.

Any help or suggestion is greatly appreciated.