How to implement WebView in Android

WebView is a view that displays web pages inside your application. WebView turns your application as a web application.

Below is the syntax for WebView

<WebView
       android:i"@+id/webview"
       andorid:layout_width="fill_parent"
       android:layout_height="fill_parent"
/>

In order to use WebView you have to get a reference of it in  java file. To get reference you have to make an Object of WebView class.

WebView webview = (WebView)findViewById(R.id.webview);

In Order to load a web url in webview you have to call loadUrl(String url) method of the WebView class.

webview.loadUrl("http://www.androidcooltech.blogspot.in/");

1. Open mainactivity.xml and write the below code.

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

<android.support.constraint.ConstraintLayout

    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="com.minixithub.webviewtutorial.MainActivity">

    <WebView

        android:id="@+id/webview"

        android:layout_width="match_parent"

        android:layout_height="match_parent">

    </WebView>
    <ProgressBar

        android:id="@+id/progressbar"

        android:layout_width="35dp" 

        android:layout_height="35dp"

        app:layout_constraintTop_toBottomOf="parent"

        app:layout_constraintBottom_toTopOf="parent"

        app:layout_constraintRight_toLeftOf="parent"

        app:layout_constraintLeft_toRightOf="parent"        />

</android.support.constraint.ConstraintLayout>

2. Open MainActivity.java and write the below code.

package com.minixithub.webviewtutorial;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private WebView webView;
    private Activity activity;
    private ProgressBar progressBar;
    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        activity = this;
        webView = (WebView)findViewById(R.id.webview);
        webView.getSettings().setJavaScriptEnabled(true);
        progressBar = (ProgressBar)findViewById(R.id.progressbar);

        //      For Open webpage in WEBVIEW
        webView.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView view, int errorCode,

                   String description, String failingUrl) {
                Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
            }
            @Override

            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
            @Override

            public void onPageStarted(WebView view, String url, Bitmap favicon) {
//          Displaying Loading Bar on Page Load Start

                progressBar.setVisibility(View.VISIBLE);
                super.onPageStarted(view, url, favicon);
            }
            @Override

            public void onPageFinished(WebView view, String url) {
//          Removing Loading on PageLoad Finish

              progressBar.setVisibility(View.GONE);
                super.onPageFinished(view, url);
            }
        });
//      Loading WebPage

        webView.loadUrl("http://androidcooltech.blogspot.in/");
    }
    @Override

    public void onBackPressed() {
//        Going Back to last WebPages on BackButton Pressed

        if(webView.canGoBack()){
            webView.goBack();
        }else

            super.onBackPressed();
    }
}

3. Open Mainfest.xml and add Internet Permission

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

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

    package="com.minixithub.webviewtutorial">

    <uses-permission android:name="android.permission.INTERNET"/>
    <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=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>