Flutter 从WebView颤振获取js函数并返回数据
在这个webview中，我使用的是一个项目的小册子，比如蔬菜、商品……等等，当你点击小册子中的项目时，它会弹出它的详细信息，这是应用程序中的功能，所以我尝试做的是，我可以用Flatter webview在应用程序中显示小册子，但是有js函数调用Flutter 从WebView颤振获取js函数并返回数据,flutter,flutter-dependencies,Flutter,Flutter Dependencies,在这个webview中，我使用的是一个项目的小册子，比如蔬菜、商品……等等，当你点击小册子中的项目时，它会弹出它的详细信息，这是应用程序中的功能，所以我尝试做的是，我可以用Flatter webview在应用程序中显示小册子，但是有js函数调用showAndroidToast（id）当我点击一个项目时，它调用函数并返回一些数据，它与纯安卓应用程序一起工作，因此我们正在将应用程序复制到ios的Flatter，但我无法访问它在点击项目时返回以下错误的函数 我在创建webview时出错 D/WebVi
showAndroidToast（id）D/WebView (16639): evaluateJavascript=showAndroidToast()
I/chromium(16639): [INFO:CONSOLE(1)] "Uncaught ReferenceError: showAndroidToast is not defined", source: https://flyerbin.com/flyer/pick-of-the-day-3398 (1)
I/BufferQueueProducer(16639): [SurfaceTexture-0-16639-4](this:0x9924e000,id:4,api:1,p:255,c:16639) queueBuffer: fps=3.65 dur=1097.05 max=742.36 min=33.99
I/chromium(16639): [INFO:CONSOLE(1)] "ReferenceError: webkit is not defined", source: https://assets.flyerbin.com/public/1602490675000/js/api.js (1)
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
WebViewController _controller;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: WebView(
initialUrl: 'https://example.com',
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController) {
_controller = webViewController;
_controller.loadUrl('${baseUrl}flyer/$flyer_id');
},
onPageFinished: (String url) {
_controller?.evaluateJavascript('showAndroidToast("Android")')?.then((result) {
print("data" + result);
});
},
),
);
}
}
I/BufferQueueProducer(16639): [SurfaceTexture-0-16639-4](this:0x9924e000,id:4,api:1,p:255,c:16639) queueBuffer: fps=3.65 dur=1097.05 max=742.36 min=33.99
I/chromium(16639): [INFO:CONSOLE(1)] "ReferenceError: webkit is not defined", source: https://assets.flyerbin.com/public/1602490675000/js/api.js (1)
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
WebViewController _controller;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: WebView(
initialUrl: 'https://example.com',
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController) {
_controller = webViewController;
_controller.loadUrl('${baseUrl}flyer/$flyer_id');
},
onPageFinished: (String url) {
_controller?.evaluateJavascript('showAndroidToast("Android")')?.then((result) {
print("data" + result);
});
},
),
);
}
}
导入'dart:async'；
进口“包装：颤振/材料.省道”；
导入“package:webview_flatter/webview_flatter.dart”；
类MyHomePage扩展StatefulWidget{
MyHomePage（{Key，this.title}）：超级（Key:Key）；
最后的字符串标题；
@凌驾
_MyHomePageState createState（）=>\u MyHomePageState（）；
}
类_MyHomePageState扩展状态{
WebViewController\u控制器；
@凌驾
小部件构建（构建上下文）{
返回脚手架(
appBar:appBar(
标题：文本（widget.title），
),
正文：WebView(
初始URL:'https://example.com',
javascriptMode:javascriptMode.unrestricted，
onWebViewCreated:（WebViewController WebViewController）{
_控制器=webViewController；
_controller.loadUrl（'${baseUrl}flyer/$flyer_id'）；
},
onPageFinished:（字符串url）{
_控制器？.evaluateJavascript（'showAndroidToast（“Android”））？。然后（（结果）{
打印（“数据”+结果）；
});
},
),
);
}
}
WebView(
initialUrl: 'https://example.com/',
javascriptMode: JavascriptMode.unrestricted,
javascriptChannels: Set.from([
JavascriptChannel(
name: "Flutter",
onMessageReceived: (JavascriptMessage message) {
getSingleItem(message.message);
}),
]),
onWebViewCreated: (WebViewController webViewController) {
_controller = webViewController;
_controller.loadUrl('${Urls.baseUrl}flyer/${flyer_id}');
},
onPageFinished: (finish) {
setState(() {
isLoading = false;
});
},
gestureNavigationEnabled: true,
),
void getSingleItem(String id) async{
in this function you can do whatever you want,means that with data we got from the javascript function you can show a data to alert box with flutter...etc
}
最终解决了这个问题，您需要使用javascript中的另一个条件来访问数据 Webview通过使用javascript通道，您可以访问js函数，对于Flatter在那里访问数据，js函数中有一些小的变化，我在这里所做的是，如果键是Flatter，它将返回单击项目的id Webview
WebView(
initialUrl: 'https://example.com/',
javascriptMode: JavascriptMode.unrestricted,
javascriptChannels: Set.from([
JavascriptChannel(
name: "Flutter",
onMessageReceived: (JavascriptMessage message) {
getSingleItem(message.message);
}),
]),
onWebViewCreated: (WebViewController webViewController) {
_controller = webViewController;
_controller.loadUrl('${Urls.baseUrl}flyer/${flyer_id}');
},
onPageFinished: (finish) {
setState(() {
isLoading = false;
});
},
gestureNavigationEnabled: true,
),
void getSingleItem(String id) async{
in this function you can do whatever you want,means that with data we got from the javascript function you can show a data to alert box with flutter...etc
}