Android webview sample code

activity_main.xml

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

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

</RelativeLayout>

MainActivity.java

package com.grobharat.GroBharat;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import android.content.DialogInterface;
import android.graphics.Bitmap;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private WebView webView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = (WebView) findViewById(R.id.webView);
        webView.setWebViewClient(new myWebClient());
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl("http://www.website.com");

        webView.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
                try {
                    webView.stopLoading();
                } catch (Exception e) {
                }

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

                webView.loadUrl("about:blank");
                AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
                alertDialog.setTitle("Error");
                alertDialog.setMessage("Check your internet connection and try again.");
                alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "Try Again", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                        startActivity(getIntent());
                    }
                });

                alertDialog.show();
                super.onReceivedError(webView, errorCode, description, failingUrl);
            }
        });
    }

    public class myWebClient extends WebViewClient
    {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            view.loadUrl(url);
            return true;

        }
    }

    @Override
    // This method is used to detect back button
    public void onBackPressed() {
        if(webView.canGoBack()) {
            webView.goBack();
        } else {
            // Let the system handle the back button
            super.onBackPressed();
        }
    }
}


AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.grobharat.GroBharat">
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="yaha pe jo bhi likha hoga wahi header pe dikhega"  
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:networkSecurityConfig="@xml/network_security_config"
        android:usesCleartextTraffic="true">

        <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>



res/xml/network_security_config.xml               ye wale ki jartoorat https na hone per padati hai

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true"/>
<domain-config cleartextTrafficPermitted="true">
    <domain includeSubdomains="true">http://www.website.com</domain>
</domain-config>
</network-security-config>