WebView in android example

<xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">


    <WebView

        android:id="@+id/webview_one"

        android:layout_width="match_parent"

        android:layout_height="match_parent"></WebView>



</FrameLayout>






package com.ducat.deep.tutorial;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.view.KeyEvent;

import android.view.View;

import android.webkit.WebResourceRequest;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.widget.ProgressBar;

import android.widget.Toast;

import com.ducat.deep.tutorial.R;


/**

 * Created by DEEP on 1/16/2018.

 */



public class WebDemo extends AppCompatActivity {



    WebView w;

    ProgressDialog pb;

    @Override

    protected void onCreate(@Nullable Bundle
savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.rel);

        w=findViewById(R.id.webview_one);

        pb=new ProgressDialog(this);

        pb.setTitle("Please Wait..");

        w.loadUrl("https://www.google.com/");

        WebSettings webSettings = w.getSettings();

        webSettings.setJavaScriptEnabled(true);

        WebViewClient wc=new DeepWeb();

        w.setWebViewClient(wc);

    }



    private class DeepWeb extends WebViewClient{

        @Override

        public void onPageStarted(WebView
view, String url, Bitmap favicon) {

           pb.show();



        }



        @Override

        public boolean shouldOverrideUrlLoading(WebView
view, String url) {

            view.loadUrl(url);

            return true;

        }



        @Override

        public void onPageFinished(WebView
view, String url) {

            super.onPageFinished(view,
url);

pb.dismiss();

        }

    }



    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event)
{

        if ((keyCode == KeyEvent.KEYCODE_BACK)
&& w.canGoBack()) {

           w.goBack();

            return true;

        }

        else{

   alertMessage();

            return false;

        }

    }



    private void alertMessage(){

        AlertDialog.Builder a=new AlertDialog.Builder(this);

        a.setTitle("Exit From Application");

        a.setMessage("Do u want to close app ? ");

        a.setCancelable(false);

        a.setNegativeButton("No", new DialogInterface.OnClickListener()
{

            @Override

            public void onClick(DialogInterface
dialog, int which) {

                dialog.dismiss();

            }

        });

        a.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{

            @Override

            public void onClick(DialogInterface
dialog, int which) {

                dialog.dismiss();

                finish();

            }

        });

        a.show();



    }



}