我正在使用 inappwebview 和 url_launcher 包制作一个人道主义颤振项目，我一直在寻找一些参考资料，但所有代码都无法正常工作，你能帮我如何让我的编码工作吗？
我的希望：我希望当url tel，mailto，sms和whatsapp点击时会根据点击的链接去应用程序，请帮助，非常感谢你提前
下面是我的项目代码
安卓清单
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app4">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.VIDEO_CAPTURE" />
<uses-permission android:name="android.permission.AUDIO_CAPTURE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
<queries>
<intent>
<action android:name="android.intent.action.VIEW" />
<data android:scheme="https" />
</intent>
<intent>
<action android:name="android.intent.action.DIAL" />
<data android:scheme="tel" />
</intent>
<intent>
<action android:name="android.intent.action.SENDTO" />
<data android:scheme="mailto" />
</intent>
<intent>
<action android:name="android.intent.action.SEND" />
<data android:mimeType="*/*" />
</intent>
</queries>
<application
android:label="app4"
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
<meta-data
android:name="io.flutter.embedding.android.NormalTheme"
android:resource="@style/NormalTheme"
/>
<meta-data
android:name="io.flutter.embedding.android.SplashScreenDrawable"
android:resource="@drawable/launch_background"
/>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<meta-data
android:name="flutterEmbedding"
android:value="2" />
</application>
</manifest>
主要.dart
import 'dart:async';
import 'dart:io';
import 'package:flutter/services.dart';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:permission_handler/permission_handler.dart';
void main() async {
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
statusBarColor: Colors.white, // status bar color
statusBarIconBrightness: Brightness.dark, // status bar icon color
systemNavigationBarColor: Colors.white, // navigation bar color
systemNavigationBarIconBrightness: Brightness.dark, // color of navigation controls
));
WidgetsFlutterBinding.ensureInitialized();
await Permission.camera.request();
await Permission.microphone.request();
await Permission.storage.request();
await AndroidInAppWebViewController.setWebContentsDebuggingEnabled(true);
await FlutterDownloader.initialize(debug: true);
runApp(MaterialApp(home: MyApp()));
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
late InAppWebViewController webViewController;
GlobalKey<ScaffoldState>webViewKey=GlobalKey<ScaffoldState>();
InAppWebViewGroupOptions options = InAppWebViewGroupOptions(
crossPlatform: InAppWebViewOptions(
useShouldOverrideUrlLoading: true,
mediaPlaybackRequiresUserGesture: false,
javaScriptEnabled: true,
javaScriptCanOpenWindowsAutomatically: true,
useOnDownloadStart: true,
),
android: AndroidInAppWebViewOptions(
useHybridComposition: true,
),
ios: IOSInAppWebViewOptions(
allowsInlineMediaPlayback: true,
)
);
late PullToRefreshController pullToRefreshController;
String url = "";
double progress = 0;
final urlController = TextEditingController();
@override
void initState() {
super.initState();
pullToRefreshController = PullToRefreshController(
options: PullToRefreshOptions(
color: Colors.red,
),
onRefresh: () async {
if (Platform.isAndroid) {
webViewController.reload();
} else if (Platform.isIOS) {
webViewController.loadUrl(
urlRequest: URLRequest(url: await webViewController.getUrl()));
}
},
);
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: _onBack,
child: Scaffold(
key: webViewKey,
appBar: null,
body: SafeArea(
child: Column(children: <Widget>[
Expanded(
child: Stack(
children: [
InAppWebView(
initialUrlRequest: URLRequest(url: Uri.parse("https://google.com/")),
initialOptions: options,
pullToRefreshController: pullToRefreshController,
onWebViewCreated: (controller) {
webViewController = controller;
},
onLoadStart: (controller, url) {
setState(() {
this.url = url.toString();
urlController.text = this.url;
});
},
androidOnPermissionRequest: (controller, origin, resources) async {
return PermissionRequestResponse(
resources: resources,
action: PermissionRequestResponseAction.GRANT);
},
shouldOverrideUrlLoading: (controller, shouldOverrideUrlLoadingRequest) async {
String action = shouldOverrideUrlLoadingRequest.url.split(':').first;
List<String> customActions = ['tel', 'whatsapp', 'mailto'];
bool isCustomAction = customActions.contains(action);
if (isCustomAction) {
if (await canLaunch(url)) {
await launch(
url,
);
return ShouldOverrideUrlLoadingAction.CANCEL;
}
}
return ShouldOverrideUrlLoadingAction.ALLOW;
},
onLoadStop: (controller, url) async {
pullToRefreshController.endRefreshing();
setState(() {
this.url = url.toString();
urlController.text = this.url;
});
},
onLoadError: (controller, url, code, message) {
pullToRefreshController.endRefreshing();
},
onProgressChanged: (controller, progress) {
if (progress == 100) {
pullToRefreshController.endRefreshing();
}
setState(() {
this.progress = progress / 100;
urlController.text = this.url;
});
},
onUpdateVisitedHistory: (controller, url, androidIsReload) {
setState(() {
this.url = url.toString();
urlController.text = this.url;
});
},
onConsoleMessage: (controller, consoleMessage) {
print(consoleMessage);
},
),
progress < 1.0
? LinearProgressIndicator(
value: progress,
minHeight: 2,
)
: Container(),
],
),
),
]
)
)
),
);
}
Future<bool> _onBack() async {
bool goBack;
if (await webViewController.canGoBack()) {
webViewController.goBack();
return false;
} else {
showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text('Kamu yakin ingin keluar ?'),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text('Tidak'),
),
FlatButton(
onPressed: () {
SystemNavigator.pop();
},
child: Text('Iya'),
),
],
));
return Future.value(true);
}
}
}
我也尝试了下面的代码，但是当点击它时，它会立即退出我的应用程序并转到浏览器而不是拨打电话、短信或 whatsapp：
shouldOverrideUrlLoading: (controller, shouldOverrideUrlLoadingRequest) async {
var uri = shouldOverrideUrlLoadingRequest.request.url!;
if (uri.scheme.startsWith("tel")) {
if (await canLaunch(url)) {
await launch(
url,
);
return NavigationActionPolicy.CANCEL;
}
}
return NavigationActionPolicy.ALLOW;
},