How to fix 'net::ERR_CLEARTEXT_NOT_PERMITTED' in flutter

问题

I have implemented webView in flutter but it is not opening my php website which is on server what I'm doing wrong.

I am new to flutter and tried webview to integrate my website webpage in my application but no luck.

Widget build(BuildContext context) {
    // TODO: implement build
    return WebviewScaffold(
      appBar: AppBar(iconTheme:IconThemeData(color: Colors.white),title: Text("Intake Form",style:new TextStyle(color: Colors.white,fontWeight: FontWeight.bold)),backgroundColor:Colors.indigoAccent,automaticallyImplyLeading: false),
     url: url,
      //url: "http://61.246.39.79:8080/",
       withJavascript: true,
       supportMultipleWindows: true,
      withLocalStorage: true,
      allowFileURLs: true,
      enableAppScheme: true,
      appCacheEnabled: true,
      hidden: false,
      scrollBar: true,
      geolocationEnabled: false,
      clearCookies: true,
       // usesCleartextTraffic="true"



    );
  }

I expect the output as running webview but error is thrown.

回答1:

set usesCleartextTraffic property to true in your AndroidManifest file, like below.

<application
....
android:usesCleartextTraffic="true"
....>

回答2:

Open the android manifest file (android/app/src/main/AndroidManifest.xml) and add

android:usesCleartextTraffic="true" to the application tag

<application
    android:name="io.flutter.app.FlutterApplication"
    android:label="tangerine_ui"
    android:icon="@mipmap/ic_launcher"
    android:usesCleartextTraffic="true">

回答3:

In AndroidManifest.xml, add [android:usesCleartextTraffic="true"] as

<application
    ......
    .......
    android:usesCleartextTraffic="true"
    .............. >
    <.........
        ................... />

            ..........
    ...........>
</application>

it not working in android version 9

回答4:

make network_security_config.xml file.

<?xml version="1.0" encoding="utf-8"?>
        <network-security-config>
            <base-config cleartextTrafficPermitted="true">
                <trust-anchors>
                    <certificates src="system" />
                </trust-anchors>
            </base-config>
        </network-security-config>

add this two line in Manifest file in Application tag.

来源：https://stackoverflow.com/questions/55592392/how-to-fix-neterr-cleartext-not-permitted-in-flutter

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Flutter

flutter-dependencies