Page blanche entre Splash screen et affichage webview

bonjour
je le dit et je le répète , je suis pas doué en java , mais j essai toujours de développer mon code webview, cette fois le probleme c'est que quand je lance mon appli il y'a un vide en blanc entre le splash screen et l affichage du contenu. je vous pris de m aider.


mon code :

MainActivity.java

package com.akssa.groupe;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {
    WebView webView;

    RelativeLayout relativeLayout;
    Button btnNoInternetConnection;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // remove title
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);

        webView = (WebView) findViewById(R.id.webView);
        // loadUrl


        webView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url.startsWith("tel:")) {
                    Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
                    startActivity(intent);
                    return true;
                }
                return false;
            }
        });





        btnNoInternetConnection = (Button) findViewById(R.id.btnNoConnection);
        relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);

        checkConnection();


        WebSettings webSettings = webView.getSettings();

        webSettings.setJavaScriptEnabled(true);
        //
        webSettings.setDomStorageEnabled(true);
        //
        webSettings.setUseWideViewPort(true);

        webSettings.setAllowContentAccess(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setAppCacheEnabled(true);



        btnNoInternetConnection.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                checkConnection();

            }
        });

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()){
        webView.goBack();
        return true;
        }
        return super.onKeyDown(keyCode, event);
    }


    public void checkConnection(){


        ConnectivityManager connectivityManager = (ConnectivityManager)
                this.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo wifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo mobileNetwork = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);


        if (wifi.isConnected()){
            webView.loadUrl("https://www.groupe-alakssa.ma/");
            webView.setVisibility(View.VISIBLE);
            relativeLayout.setVisibility(View.GONE);



        }
        else if (mobileNetwork.isConnected()){
            webView.loadUrl("https://www.groupe-alakssa.ma/");
            webView.setVisibility(View.VISIBLE);
            relativeLayout.setVisibility(View.GONE);

        }
        else {


            webView.setVisibility(View.GONE);
            relativeLayout.setVisibility(View.VISIBLE);



        }



    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.akssa.groupe">

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name="com.akssa.groupe.SplashScreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.akssa.groupe.MainActivity">

        </activity>
    </application>

</manifest>