getCookies() without a URL parameter causes NullPointerExceptions

[Aulig]

Steps to reproduce:

• load the example project
• change the line final gotCookies = await cookieManager.getCookies(_url); to final gotCookies = await cookieManager.getCookies();
• run the project (I'm using Android)

Resulting error:

E/MethodChannel#webview_cookie_manager(28148): Failed to handle method call
E/MethodChannel#webview_cookie_manager(28148): java.lang.NullPointerException
E/MethodChannel#webview_cookie_manager(28148):  at android.net.WebAddress.<init>(WebAddress.java:77)
E/MethodChannel#webview_cookie_manager(28148):  at v3.a(PG:1)
E/MethodChannel#webview_cookie_manager(28148):  at v3.getCookie(PG:1)
E/MethodChannel#webview_cookie_manager(28148):  at io.flutter.plugins.webview_cookie_manager.WebviewCookieManagerPlugin.getCookies(WebviewCookieManagerPlugin.java:106)
E/MethodChannel#webview_cookie_manager(28148):  at io.flutter.plugins.webview_cookie_manager.WebviewCookieManagerPlugin.onMethodCall(WebviewCookieManagerPlugin.java:59)
E/MethodChannel#webview_cookie_manager(28148):  at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:230)
E/MethodChannel#webview_cookie_manager(28148):  at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#webview_cookie_manager(28148):  at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/MethodChannel#webview_cookie_manager(28148):  at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#webview_cookie_manager(28148):  at android.os.MessageQueue.next(MessageQueue.java:336)
E/MethodChannel#webview_cookie_manager(28148):  at android.os.Looper.loop(Looper.java:174)
E/MethodChannel#webview_cookie_manager(28148):  at android.app.ActivityThread.main(ActivityThread.java:7356)
E/MethodChannel#webview_cookie_manager(28148):  at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#webview_cookie_manager(28148):  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
E/MethodChannel#webview_cookie_manager(28148):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
E/flutter (28148): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: PlatformException(error, null, null)
E/flutter (28148): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:572:7)
E/flutter (28148): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:161:18)
E/flutter (28148): <asynchronous suspension>
E/flutter (28148): #2      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:334:12)
E/flutter (28148): #3      MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:347:40)
E/flutter (28148): #4      WebviewCookieManager.getCookies (package:webview_cookie_manager/webview_cookie_manager.dart:28:21)
E/flutter (28148): #5      _MyAppState.build.<anonymous closure> (package:webview_cookie_manager_example/main.dart:50:52)
E/flutter (28148): #6      _PlatformCallbacksHandler.onPageFinished (package:webview_flutter/webview_flutter.dart:491:29)
E/flutter (28148): #7      MethodChannelWebViewPlatform._onMethodCall (package:webview_flutter/src/webview_method_channel.dart:41:35)
E/flutter (28148): #8      MethodChannel._handleAsMethodCall (package:flutter/src/services/platform_channel.dart:432:55)
E/flutter (28148): #9      MethodChannel.setMethodCallHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:385:33)
E/flutter (28148): #10     _DefaultBinaryMessenger.handlePlatformMessage (package:flutter/src/services/binding.dart:267:33)
E/flutter (28148): #11     _invoke3.<anonymous closure> (dart:ui/hooks.dart:282:15)
E/flutter (28148): #12     _rootRun (dart:async/zone.dart:1190:13)
E/flutter (28148): #13     _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (28148): #14     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter (28148): #15     _invoke3 (dart:ui/hooks.dart:281:10)
E/flutter (28148): #16     _dispatchPlatformMessage (dart:ui/hooks.dart:156:5)

Apart from this error I love this package! Thanks for your work!

[fryette]

Unfortunately, we cannot provide an implementation for getAllCookies() method on the Android platform. We will restrict getAllCookies() by URL.

[clragon]

is this the reason why getCookies with null as argument returns an empty list? it seems that getting all cookies regardless of domain is not possible.

This isnt mentioned in the doc comment of the function and I just spent quite a while debugging this.