webview_flutter_android #

The Android implementation of webview_flutter.

Usage #

This package is endorsed, which means you can simply use webview_flutter normally. This package will be automatically included in your app when you do, so you do not need to add it to your pubspec.yaml.

However, if you import this package to use any of its APIs directly, you should add it to your pubspec.yaml as usual.

Display Mode #

This plugin supports two different platform view display modes. The default display mode is subject to change in the future, and will not be considered a breaking change, so if you want to ensure a specific mode, you can set it explicitly.

Texture Layer Hybrid Composition #

This is the current default mode for versions >=23. This is a new display mode used by most plugins starting with Flutter 3.0. This is more performant than Hybrid Composition, but has some limitations from using an Android SurfaceTexture. See:

• https://github.com/flutter/flutter/issues/104889
• https://github.com/flutter/flutter/issues/116954

Hybrid Composition #

This is the current default mode for versions <23. It ensures that the WebView will display and work as expected, at the cost of some performance. See:

• https://flutter.cn/docs/development/platform-integration/platform-views#performance

This can be configured for versions >=23 with AndroidWebViewWidgetCreationParams.displayWithHybridComposition. See https://pub-web.flutter-io.cn/packages/webview_flutter#platform-specific-features for more details on setting platform-specific features in the main plugin.

External Native API #

The plugin also provides a native API accessible by the native code of Android applications or packages. This API follows the convention of breaking changes of the Dart API, which means that any changes to the class that are not backwards compatible will only be made with a major version change of the plugin. Native code other than this external API does not follow breaking change conventions, so app or plugin clients should not use any other native APIs.

The API can be accessed by importing the native class WebViewFlutterAndroidExternalApi:

Java:

import io.flutter.plugins.webviewflutter.WebViewFlutterAndroidExternalApi;

Fullscreen Video #

To display a video as fullscreen, an app must manually handle the notification that the current page has entered fullscreen mode. This can be done by calling AndroidWebViewController.setCustomWidgetCallbacks. Below is an example implementation.

androidController.setCustomWidgetCallbacks(
  onShowCustomWidget: (Widget widget, OnHideCustomWidgetCallback callback) {
    Navigator.of(context).push(MaterialPageRoute<void>(
      builder: (BuildContext context) => widget,
      fullscreenDialog: true,
    ));
  },
  onHideCustomWidget: () {
    Navigator.of(context).pop();
  },
);

Contributing #

This package uses pigeon to generate the communication layer between Flutter and the host platform (Android). The communication interface is defined in the pigeons/android_webview.dart file. After editing the communication interface regenerate the communication layer by running dart run pigeon --input pigeons/android_webview.dart.

Besides pigeon this package also uses mockito to generate mock objects for testing purposes. To generate the mock objects run the following command:

dart run build_runner build --delete-conflicting-outputs

If you would like to contribute to the plugin, check out our contribution guide.