# Flutter InAppBrowser Plugin [](https://twitter.com/intent/tweet?text=Flutter%20InAppBrowser%20plugin!&url=https://github.com/pichillilorenzo/flutter_inappbrowser&hashtags=flutter,flutterio,dart,dartlang,webview) [](https://www.facebook.com/sharer/sharer.php?u=https%3A//github.com/pichillilorenzo/flutter_inappbrowser)
During the build, if Android fails with `Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 17 declared in library`, it means that you need to update the `minSdkVersion` of your `build.gradle` file to at least `17`.
Because of [Flutter AndroidX compatibility](https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility), the latest version that doesn't use `AndroidX` is `0.6.0`.
If you are starting a new fresh app, you need to create the Flutter App with `flutter create -i swift` (see [flutter/flutter#13422 (comment)](https://github.com/flutter/flutter/issues/13422#issuecomment-392133780)), otherwise, you will get this message:
=== BUILD TARGET flutter_inappbrowser OF PROJECT Pods WITH CONFIGURATION Debug ===
The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift. Supported values are: 3.0, 4.0, 4.2. This setting can be set in the build settings editor.
If you still have this problem, try to edit iOS `Podfile` like this (see [#15](https://github.com/pichillilorenzo/flutter_inappbrowser/issues/15)):
```
target 'Runner' do
use_frameworks! # required by simple_permission
...
end
post_install do |installer|
installer.pods_project.targets.each do |target|
target.build_configurations.each do |config|
config.build_settings['SWIFT_VERSION'] = '4.0' # required by simple_permission
config.build_settings['ENABLE_BITCODE'] = 'NO'
end
end
end
```
Instead, if you have already a non-swift project, you can check this issue to solve the problem: [Friction adding swift plugin to objective-c project](https://github.com/flutter/flutter/issues/16049).
- [InAppWebView](#inappwebview-class): Flutter Widget for adding an **inline native WebView** integrated into the flutter widget tree. To use `InAppWebView` class on iOS you need to opt-in for the embedded views preview by adding a boolean property to the app's `Info.plist` file, with the key `io.flutter.embedded_views_preview` and the value `YES`.
- [InAppBrowser](#inappbrowser-class): In-App Browser using native WebView.
- [ChromeSafariBrowser](#chromesafaribrowser-class): In-App Browser using [Chrome Custom Tabs](https://developer.android.com/reference/android/support/customtabs/package-summary) on Android / [SFSafariViewController](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller) on iOS.
- [InAppLocalhostServer](#inapplocalhostserver-class): This class allows you to create a simple server on `http://localhost:[port]/`. The default `port` value is `8080`.
[AndroidView](https://docs.flutter.io/flutter/widgets/AndroidView-class.html) and [UiKitView](https://docs.flutter.io/flutter/widgets/UiKitView-class.html) are not officially stable yet!
To use `InAppWebView` class on iOS you need to opt-in for the embedded views preview by adding a boolean property to the app's `Info.plist` file, with the key `io.flutter.embedded_views_preview` and the value `YES`.
- __javaScriptEnabled__: Set to `true` to enable JavaScript. The default value is `true`.
- __javaScriptCanOpenWindowsAutomatically__: Set to `true` to allow JavaScript open windows without user interaction. The default value is `false`.
- __mediaPlaybackRequiresUserGesture__: Set to `true` to prevent HTML5 audio or video from autoplaying. The default value is `true`.
**Android** supports these additional options:
- __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
- __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
- __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
- __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
- __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
- __useWideViewPort__: Set to `true` if the WebView should enable support for the "viewport" HTML meta tag or should use a wide viewport. When the value of the setting is false, the layout width is always set to the width of the WebView control in device-independent (CSS) pixels. When the value is true and the page contains the viewport meta tag, the value of the width specified in the tag is used. If the page does not contain the tag or does not provide a width, then a wide viewport will be used. The default value is `true`.
- __safeBrowsingEnabled__: Set to `true` if you want the Safe Browsing is enabled. Safe Browsing allows WebView to protect against malware and phishing attacks by verifying the links. The default value is `true`.
- __textZoom__: Set text scaling of android-webview. The default value is `100`.
- __disallowOverScroll__: Set to `true` to disable the bouncing of the WebView when the scrolling has reached an edge of the content. The default value is `false`.
- __enableViewportScale__: Set to `true` to allow a viewport meta tag to either disable or restrict the range of user scaling. The default value is `false`.
- __suppressesIncrementalRendering__: Set to `true` if you want the WebView suppresses content rendering until it is fully loaded into memory.. The default value is `false`.
- __allowsAirPlayForMediaPlayback__: Set to `true` to allow AirPlay. The default value is `true`.
- __allowsBackForwardNavigationGestures__: Set to `true` to allow the horizontal swipe gestures trigger back-forward list navigations. The default value is `true`.
- __allowsLinkPreview__: Set to `true` to allow that pressing on a link displays a preview of the destination for the link. The default value is `true`.
- __ignoresViewportScaleLimits__: Set to `true` if you want that the WebView should always allow scaling of the webpage, regardless of the author's intent. The ignoresViewportScaleLimits property overrides the `user-scalable` HTML property in a webpage. The default value is `false`.
- __allowsInlineMediaPlayback__: Set to `true` to allow HTML5 media playback to appear inline within the screen layout, using browser-supplied controls rather than native controls. For this to work, add the `webkit-playsinline` attribute to any `<video>` elements. The default value is `false`.
- __allowsPictureInPictureMediaPlayback__: Set to `true` to allow HTML5 videos play picture-in-picture. The default value is `true`.
#### Events
Event `onWebViewCreated` fires when the `InAppWebView` is created.
This is not always the same as the URL passed to `InAppWebView.onLoadStarted` because although the load for that URL has begun, the current page may not have changed.
Loads the given `assetFilePath` with optional `headers` specified as a map from name to value.
To be able to load your local files (html, js, css, etc.), you need to add them in the `assets` section of the `pubspec.yaml` file, otherwise they cannot be found!
Example of a `pubspec.yaml` file:
```yaml
...
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
Returns a boolean value indicating whether the `InAppWebView` can go back or forward the given number of steps. Steps is negative if backward and positive if forward.
Adds a JavaScript message handler `callback` (`JavaScriptHandlerCallback`) that listen to post messages sent from JavaScript by the handler with name `handlerName`.
The Android implementation uses [addJavascriptInterface](https://developer.android.com/reference/android/webkit/WebView#addJavascriptInterface(java.lang.Object,%20java.lang.String)).
The iOS implementation uses [addScriptMessageHandler](https://developer.apple.com/documentation/webkit/wkusercontentcontroller/1537172-addscriptmessagehandler?language=objc)
The JavaScript function that can be used to call the handler is `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args);`, where `args` are [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
The `args` will be stringified automatically using `JSON.stringify(args)` method and then they will be decoded on the Dart side.
In order to call `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args)` properly, you need to wait and listen the JavaScript event `flutterInAppBrowserPlatformReady`.
This event will be dispatch as soon as the platform (Android or iOS) is ready to handle the `callHandler` method.
`window.flutter_inappbrowser.callHandler` returns a JavaScript [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
that can be used to get the json result returned by `JavaScriptHandlerCallback`.
In this case, simply return data that you want to send and it will be automatically json encoded using `jsonEncode` from the `dart:convert` library.
So, on the JavaScript side, to get data coming from the Dart side, you will use:
- __javaScriptEnabled__: Set to `true` to enable JavaScript. The default value is `true`.
- __javaScriptCanOpenWindowsAutomatically__: Set to `true` to allow JavaScript open windows without user interaction. The default value is `false`.
- __hidden__: Set to `true` to create the browser and load the page, but not show it. The `onLoadStop` event fires when loading is complete. Omit or set to `false` (default) to have the browser open and load normally.
- __toolbarTop__: Set to `false` to hide the toolbar at the top of the WebView. The default value is `true`.
- __hideTitleBar__: Set to `true` if you want the title should be displayed. The default value is `false`.
- __closeOnCannotGoBack__: Set to `false` to not close the InAppBrowser when the user click on the back button and the WebView cannot go back to the history. The default value is `true`.
- __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
- __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
- __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
- __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
- __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
- __useWideViewPort__: Set to `true` if the WebView should enable support for the "viewport" HTML meta tag or should use a wide viewport. When the value of the setting is false, the layout width is always set to the width of the WebView control in device-independent (CSS) pixels. When the value is true and the page contains the viewport meta tag, the value of the width specified in the tag is used. If the page does not contain the tag or does not provide a width, then a wide viewport will be used. The default value is `true`.
- __safeBrowsingEnabled__: Set to `true` if you want the Safe Browsing is enabled. Safe Browsing allows WebView to protect against malware and phishing attacks by verifying the links. The default value is `true`.
- __progressBar__: Set to `false` to hide the progress bar at the bottom of the toolbar at the top. The default value is `true`.
- __disallowOverScroll__: Set to `true` to disable the bouncing of the WebView when the scrolling has reached an edge of the content. The default value is `false`.
- __toolbarBottom__: Set to `false` to hide the toolbar at the bottom of the WebView. The default value is `true`.
- __presentationStyle__: Set the custom modal presentation style when presenting the WebView. The default value is `0 //fullscreen`. See [UIModalPresentationStyle](https://developer.apple.com/documentation/uikit/uimodalpresentationstyle) for all the available styles.
- __transitionStyle__: Set to the custom transition style when presenting the WebView. The default value is `0 //crossDissolve`. See [UIModalTransitionStyle](https://developer.apple.com/documentation/uikit/uimodaltransitionStyle) for all the available styles.
- __enableViewportScale__: Set to `true` to allow a viewport meta tag to either disable or restrict the range of user scaling. The default value is `false`.
- __suppressesIncrementalRendering__: Set to `true` if you want the WebView suppresses content rendering until it is fully loaded into memory.. The default value is `false`.
- __allowsAirPlayForMediaPlayback__: Set to `true` to allow AirPlay. The default value is `true`.
- __allowsBackForwardNavigationGestures__: Set to `true` to allow the horizontal swipe gestures trigger back-forward list navigations. The default value is `true`.
- __allowsLinkPreview__: Set to `true` to allow that pressing on a link displays a preview of the destination for the link. The default value is `true`.
- __ignoresViewportScaleLimits__: Set to `true` if you want that the WebView should always allow scaling of the webpage, regardless of the author's intent. The ignoresViewportScaleLimits property overrides the `user-scalable` HTML property in a webpage. The default value is `false`.
- __allowsInlineMediaPlayback__: Set to `true` to allow HTML5 media playback to appear inline within the screen layout, using browser-supplied controls rather than native controls. For this to work, add the `webkit-playsinline` attribute to any `<video>` elements. The default value is `false`.
- __allowsPictureInPictureMediaPlayback__: Set to `true` to allow HTML5 videos play picture-in-picture. The default value is `true`.
- __spinner__: Set to `false` to hide the spinner when the WebView is loading a page. The default value is `true`.
To be able to load your local files (assets, js, css, etc.), you need to add them in the `assets` section of the `pubspec.yaml` file, otherwise they cannot be found!
[Chrome Custom Tabs](https://developer.android.com/reference/android/support/customtabs/package-summary) on Android / [SFSafariViewController](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller) on iOS.
-`url`: The `url` to load. Call `encodeUriComponent()` on this if the `url` contains Unicode characters.
-`options`: Options for the `ChromeSafariBrowser`.
-`headersFallback`: The additional header of the `InAppBrowser` instance fallback to be used in the HTTP request for this URL, specified as a map from name to value.
-`optionsFallback`: Options used by the `InAppBrowser` instance fallback.
**Android** supports these options:
- __addShareButton__: Set to `false` if you don't want the default share button. The default value is `true`.
- __showTitle__: Set to `false` if the title shouldn't be shown in the custom tab. The default value is `true`.
- __toolbarBackgroundColor__: Set the custom background color of the toolbar.
- __enableUrlBarHiding__: Set to `true` to enable the url bar to hide as the user scrolls down on the page. The default value is `false`.
- __instantAppsEnabled__: Set to `true` to enable Instant Apps. The default value is `false`.
**iOS** supports these options:
- __entersReaderIfAvailable__: Set to `true` if Reader mode should be entered automatically when it is available for the webpage. The default value is `false`.
- __barCollapsingEnabled__: Set to `true` to enable bar collapsing. The default value is `false`.
- __dismissButtonStyle__: Set the custom style for the dismiss button. The default value is `0 //done`. See [SFSafariViewController.DismissButtonStyle](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller/dismissbuttonstyle) for all the available styles.
- __preferredBarTintColor__: Set the custom background color of the navigation bar and the toolbar.
- __preferredControlTintColor__: Set the custom color of the control buttons on the navigation bar and the toolbar.
- __presentationStyle__: Set the custom modal presentation style when presenting the WebView. The default value is `0 //fullscreen`. See [UIModalPresentationStyle](https://developer.apple.com/documentation/uikit/uimodalpresentationstyle) for all the available styles.
- __transitionStyle__: Set to the custom transition style when presenting the WebView. The default value is `0 //crossDissolve`. See [UIModalTransitionStyle](https://developer.apple.com/documentation/uikit/uimodaltransitionStyle) for all the available styles.
This class allows you to create a simple server on `http://localhost:[port]/` in order to be able to load your assets file on a server. The default `port` value is `8080`.
**NOTE for iOS**: For the iOS Platform, you need to add the `NSAllowsLocalNetworking` key with `true` in the `Info.plist` file (See [ATS Configuration Basics](https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW35)):
```xml
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsLocalNetworking</key>
<true/>
</dict>
```
The `NSAllowsLocalNetworking` key is available since **iOS 10**.
