3 - Add WebView Class

Create  the WebViewApplixir  class  (this class will completely load and handle the webview ) :

JAVA:

import android.content.Context;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;

import androidx.annotation.NonNull;

public class WebViewApplixir extends WebView {

    private String webUrl;
    private Context context;

    public WebViewApplixir(@NonNull Context context,String webUrl) {
        super(context);

        this.context=context;
        this.webUrl=webUrl; // your website URL

        WebSettings webSettings = this.getSettings();
        webSettings.setJavaScriptEnabled(true);

    this.setWebViewClient(new WebViewClient()); 
    }

    public void showAds(OnCompleteAdListener onCompleteAdListener){

        this.loadUrl(webUrl);

        this.addJavascriptInterface(new  Applixir(context){

            @JavascriptInterface
            @Override
            public void adStatusCallback(String status) {
                super.adStatusCallback(status);

                onCompleteAdListener.statusCallBack(status);

            }
        } ,"Android");

    }

    public interface OnCompleteAdListener {

        void statusCallBack(String status);

    }

    public class Applixir{
        Context mContext;

        public Applixir(Context c) {
            mContext = c;
        }

        @JavascriptInterface
        public void adStatusCallback(String status) {

        }
    }
}

KOTLIN:

import android.content.Context
import android.webkit.JavascriptInterface
import android.webkit.WebView
import android.webkit.WebViewClient

class WebViewApplixirKotlin( context: Context, private val webUrl: String) :

    WebView(context) {
    fun showAds(onCompleteAdListener:OnCompleteAdListener) {
        this.loadUrl(webUrl)
        addJavascriptInterface(object : Applixir(context) {
            @JavascriptInterface
            override fun adStatusCallback(status: String?) {
                super.adStatusCallback(status)
                onCompleteAdListener.statusCallBack(status)
            }
        }, "Android")
    }

    interface OnCompleteAdListener {
        fun statusCallBack(status: String?)
    }

    open inner class Applixir(var mContext: Context) {
        @JavascriptInterface
        open fun adStatusCallback(status: String?) {
        }
    }

    init {
        val webSettings = this.settings
        webSettings.javaScriptEnabled = true

    }
}

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