WebView Activity

public class Web extends AppCompatActivity {
    private WebView webview;
    private ProgressBar progressBar;

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


        if(isNetworkStatusAvialable (getApplicationContext())) {
            MobileAds.initialize(this,getString(R.string.app_ad_id));
            AdView adView = findViewById(R.id.webAdView);
            AdRequest adRequest = new AdRequest.Builder().build();
            adView.loadAd(adRequest);

        } else {
            Toast.makeText(getApplicationContext(), "No Internet Connection!", Toast.LENGTH_LONG).show();
            finish();

        }

        progressBar = findViewById(R.id.progressBar);

        webview = findViewById(R.id.webView);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.getSettings().setLoadsImagesAutomatically(true);
        webview.setWebViewClient(new WebViewClient());

        webview.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView view, int progress) {
                progressBar.setProgress(progress);
                if (progress > 55) {
                    progressBar.setVisibility(View.GONE);

                } else {
                    progressBar.setVisibility(View.VISIBLE);

                }
            }
        });
        webview.loadUrl("http://url here");

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_BACK:
                    if (webview.canGoBack()) {
                        webview.goBack();
                    } else {
                        finish();
                    }
                    return true;
            }

        }
        return super.onKeyDown(keyCode, event);
    }

    public static boolean isNetworkStatusAvialable (Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager != null)
        {
            NetworkInfo netInfos = connectivityManager.getActiveNetworkInfo();
            if(netInfos != null)
                if(netInfos.isConnected())
                    return true;
        }
        return false;
    }


}


//XML Code..............

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>

    <include
        layout="@layout/ad_view" />

</FrameLayout>