颤振释放apk没有连接到我的后端

Question

我的应用程序在调试模式下连接到我的后端，没有任何问题。但是当我试图获得apk版本并安装它时，网络无法工作。我试着补充

我正在采取这样的发布apk：

flutter clean
flutter build apk --release

这是我的Android手册.xml：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gucarsoft.yemek_tarifi_odev_mobil">

<uses-permission android:name="android.permission.INTERNET" />

<application
    android:label="yemek_tarifi_odev_mobil"
    android:icon="@mipmap/ic_launcher">

    <activity
        android:name=".MainActivity"
        android:launchMode="singleTop"
        android:theme="@style/LaunchTheme"
        android:usesCleartextTraffic="true"
        android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
        android:hardwareAccelerated="true"
        android:windowSoftInputMode="adjustResize">
        <!-- Specifies an Android theme to apply to this Activity as soon as
             the Android process has started. This theme is visible to the user
             while the Flutter UI initializes. After that, this theme continues
             to determine the Window background behind the Flutter UI. -->
        <meta-data
          android:name="io.flutter.embedding.android.NormalTheme"
          android:resource="@style/NormalTheme"
          />
        <!-- Displays an Android View that continues showing the launch screen
             Drawable until Flutter paints its first frame, then this splash
             screen fades out. A splash screen is useful to avoid any visual
             gap between the end of Android's launch screen and the painting of
             Flutter's first frame. -->
        <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>
    <!-- Don't delete the meta-data below.
         This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
    <meta-data
        android:name="flutterEmbedding"
        android:value="2" />
</application>

这是我的示例请求：

static Future<UserModel> register(String username, String password) async {
try {
  String token;

  final response = await http.post(
    url + "/register",
    headers: <String, String>{
      'Content-Type': 'application/json; charset=UTF-8',
    },
    body: jsonEncode(<String, String>{
      'username': username,
      'password': password,
      'email': username,
    }),
  ); //headers: header);
  if (response.statusCode == 200) {
    return new UserModel();
  } else {
    print("error!");
    return null;
  }
} catch (e) {
  print("error!\n" + e.toString());
  return null;
}

}

Answer 1

您可以尝试将此配置放入您的项目中：

在res/xml文件夹中为examplonetwork_security_config.xml创建文件：

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <!--Set application-wide security config using base-config tag.-->
    <base-config cleartextTrafficPermitted="true"/>
</network-security-config>

在你Android手册中，把这个：

<application
        android:networkSecurityConfig="@xml/network_security_config"