added getCookies() and getCookie() for Android

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/MyCookieManager.java

 package com.pichillilorenzo.flutter_inappbrowser;
 
 import android.os.Build;
-import android.text.TextUtils;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.ValueCallback;
 
 import java.net.HttpCookie;
-import java.net.MalformedURLException;
-import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
@@ -44,6 +44,9 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
           MyCookieManager.setCookie(url, name, value, domain, path, expiresDate, isHTTPOnly, isSecure, result);
         }
         break;
+      case "getCookies":
+        result.success(MyCookieManager.getCookies((String) call.argument("url")));
+        break;
       default:
         result.notImplemented();
     }
@@ -70,7 +73,6 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
     if (expiresDate != null)
       cookieValue += "; Max-Age=" + expiresDate.toString();
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
     if (isHTTPOnly != null && isHTTPOnly)
       cookieValue += "; HttpOnly";
 
@@ -93,4 +95,24 @@ public class MyCookieManager implements MethodChannel.MethodCallHandler {
     }
   }
 
+  public static List<Map<String, Object>> getCookies(final String url) {
+
+    final List<Map<String, Object>> cookieListMap = new ArrayList<>();
+
+    CookieManager cookieManager = CookieManager.getInstance();
+
+    String[] cookies = cookieManager.getCookie(url).split(";");
+    for (String cookie : cookies) {
+      String[] nameValue = cookie.split("=", 2);
+      String name = nameValue[0].trim();
+      String value = nameValue[1].trim();
+      Map<String, Object> cookieMap = new HashMap<>();
+      cookieMap.put("name", name);
+      cookieMap.put("value", value);
+      cookieListMap.add(cookieMap);
+    }
+    return cookieListMap;
+
+  }
+
 }

example/android/build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }
 

example/lib/main.dart

@@ -66,6 +66,12 @@ class MyInAppBrowser extends InAppBrowser {
 //    await this.webViewController.injectScriptCode("console.debug('testDebug', true);");
 //
     print(await this.webViewController.injectScriptCode("document.cookie"));
+
+    print("");
+    print(await CookieManager.getCookies("https://flutter.io/"));
+    print("");
+    print(await CookieManager.getCookie("https://flutter.io/", "_ga"));
+    print("");
 //
 //    print(await this.webViewController.injectScriptCode("null"));
 //    print(await this.webViewController.injectScriptCode("undefined"));
@@ -281,6 +287,7 @@ class _MyAppState extends State<MyApp> {
                 //"toolbarTop": false,
                 //"toolbarBottom": false
               });
+
             },
             child: Text("Open InAppBrowser")
           ),

lib/flutter_inappbrowser.dart

@@ -1119,6 +1119,7 @@ class InAppLocalhostServer {
 
 }
 
+///Manages the cookies used by an application's [InAppWebView] instances.
 class CookieManager {
   static bool _initialized = false;
   static const MethodChannel _channel = const MethodChannel('com.pichillilorenzo/flutter_inappbrowser_cookiemanager');
@@ -1131,6 +1132,7 @@ class CookieManager {
   static Future<dynamic> _handleMethod(MethodCall call) async {
   }
 
+  ///Sets a cookie for the given [url]. Any existing cookie with the same [host], [path] and [name] will be replaced with the new cookie. The cookie being set will be ignored if it is expired.
   static Future<void> setCookie(String url, String name, String value, String domain,
       { String path = "/",
         int expiresDate,
@@ -1157,4 +1159,36 @@ class CookieManager {
 
     await _channel.invokeMethod('setCookie', args);
   }
+
+  ///Gets all the cookies for the given [url].
+  static Future<List<Map<String, dynamic>>> getCookies(String url) async {
+    assert(url != null && url.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    List<dynamic> cookies = await _channel.invokeMethod('getCookies', args);
+    cookies = cookies.cast<Map<dynamic, dynamic>>();
+    for(var i = 0; i < cookies.length; i++) {
+      cookies[i] = cookies[i].cast<String, dynamic>();
+    }
+    cookies = cookies.cast<Map<String, dynamic>>();
+    return cookies;
+  }
+
+  ///Gets a cookie by its [cookieName] for the given [url].
+  static Future<Map<String, dynamic>> getCookie(String url, String cookieName) async {
+    assert(url != null && url.isNotEmpty);
+    assert(cookieName != null && cookieName.isNotEmpty);
+
+    Map<String, dynamic> args = <String, dynamic>{};
+    args.putIfAbsent('url', () => url);
+    List<dynamic> cookies = await _channel.invokeMethod('getCookies', args);
+    cookies = cookies.cast<Map<dynamic, dynamic>>();
+    for(var i = 0; i < cookies.length; i++) {
+      cookies[i] = cookies[i].cast<String, dynamic>();
+      if (cookies[i]["name"] == cookieName)
+        return cookies[i];
+    }
+    return null;
+  }
 }