Capture Requests and Get Cookies of Web Page in a WebView in Android

Introduction

 

Using WebView we can create an Android application but not a native Android application.

 

Assuming we want to customize that application, we must capture the request executed when the web page is loaded.

 

When the request is captured then we can only redirect the control to an activity then we can develop the activity using an overridden method in WebViewClient. 

public void onLoadResource(WebView view, String url){}

For instance,

WebView mWebView;
mWebView.setWebViewClient(new MyWebViewClient()

{
   @Override
   public void onLoadResource(WebView view, String url){

      System.out.println("Current URL : "+ url + " " + Html.fromHtml("<br>") + " is http url ? "+ URLUtil.isHttpUrl(url));

      if( url.equals("http://www.c-sharpcorner.com/1/247/android-programming.aspx"))
      {
         Toast.makeText(getApplicationContext(), "Android Articles page is loading... ", Toast.LENGTH_LONG).show();
      }
   }
}

Assume we want to get cookies to get session details and other information, then depending on the URL we can get the cookies.

 

  We can also get the session of the web page loaded in the WebView.

 

  CookieSyncManager

 

  The CookieSyncManager synchronizes the browser cookie store between main memory and permanent storage. 

 

CookieSyncManager.getInstance().sync();

For instance,

public void onPageFinished(WebView view, String url){
   CookieSyncManager.getInstance().sync();
   URL url1 = null;
   try {
      url1 = new URL(url);
   }
   catch (MalformedURLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
   }
   System.out.println("C sharp corner user Ref " + url1.getRef());
   System.out.println(" C sharp corner user host " + url1.getHost());
   System.out.println("C sharp corner user authority " + url1.getAuthority());
   String cookies = CookieManager.getInstance().getCookie(url);
   System.out.println("All COOKIES " + cookies);
   Toast.makeText(getApplicationContext(),"All Cookies " + cookies , Toast.LENGTH_LONG).show();
}

Source Code-

 

MainActivity.java 

package com.example.webviewdemo;
import java.net.MalformedURLException;
import java.net.URL;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.Html;
import android.webkit.CookieManager;
import android.webkit.CookieSyncManager;
import android.webkit.URLUtil;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends Activity {
    public Context context;
    public class MyWebViewClient extends WebViewClient {}
    WebView mWebView;
    String url = "http://www.c-sharpcorner.com/";@SuppressLint("SetJavaScriptEnabled")@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWebView = (WebView) findViewById(R.id.webView1);
        mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        mWebView.getSettings().setBuiltInZoomControls(true);
        mWebView.setWebViewClient(new MyWebViewClient() {@Override
            public void onLoadResource(WebView view, String url) {
                System.out.println("Current URL : " + url + " " + Html.fromHtml("<br>") + " is http url ? " + URLUtil.isHttpUrl(url));
                if (url.equals("http://www.c-sharpcorner.com/1/247/android-programming.aspx")) {
                    Toast.makeText(getApplicationContext(), "Android Articles page is loading... ", Toast.LENGTH_LONG).show();
                }
            }@Override
            public void onPageFinished(WebView view, String url) {
                CookieSyncManager.getInstance().sync();
                URL url1 = null;
                try {
                    url1 = new URL(url);
                } catch (MalformedURLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                System.out.println("C sharp corner user Ref " + url1.getRef());
                System.out.println(" C sharp corner user host " + url1.getHost());
                System.out.println("C sharp corner user authority " + url1.getAuthority());
                String cookies = CookieManager.getInstance().getCookie(url);
                System.out.println("All COOKIES " + cookies);
                Toast.makeText(getApplicationContext(), "All Cookies " + cookies, Toast.LENGTH_LONG).show();
            }
        });
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.loadUrl(url);
    }@Override
    public void onBackPressed() {
        if (mWebView.canGoBack()) {
            mWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical" >
   <WebView
   android:id="@+id/webView1"
   android:layout_width="match_parent"
   android:layout_height="match_parent" />
</LinearLayout>

Note

 

Add Permission of the internet in the manifest file.

<uses-permission android:name="android.permission.INTERNET" />

Output

 

After capturing the request URL before a web page,

 

 

Android Program

 

After getting a cookies session in a WebView,

 

Figure 2- WebView