flutter开发实战-解决release下Error: SocketException: Failed host lookup问题

当在开发App过程中，在Debug下接口访问正常，但是通过flutter build apk lib/main.dart --release打包后安装，发现Android手机上无法请求数据，报Error: SocketException: Failed host lookup的错误

一、解决Android的release下Error: SocketException: Failed host lookup问题

在工程的android/app/main/AndroidManifest.xml需要添加网络请求权限

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

AndroidManifest.xml完整结构如下

<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="cn.example.flutter_app"><uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /><applicationandroid:label="flutter_app"android:name="${applicationName}"android:usesCleartextTraffic="true"android:icon="@mipmap/ic_launcher"><activityandroid:name=".MainActivity"android:exported="true"android:launchMode="singleTop"android:theme="@style/LaunchTheme"android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"android:hardwareAccelerated="true"android:usesCleartextTraffic="true"android:windowSoftInputMode="adjustResize"android:networkSecurityConfig="@xml/network_security_config"><!-- Specifies an Android theme to apply to this Activity as soon asthe Android process has started. This theme is visible to the userwhile the Flutter UI initializes. After that, this theme continuesto determine the Window background behind the Flutter UI. --><meta-dataandroid:name="io.flutter.embedding.android.NormalTheme"android:resource="@style/NormalTheme"/><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-dataandroid:name="flutterEmbedding"android:value="2" /></application>
</manifest>

二、iOS工程info.plist文件配置

在ios/Runner/info.plist添加NSAppTransportSecurity

<key>NSAppTransportSecurity</key><dict><key>NSAllowsArbitraryLoads</key><true/></dict>

完整的info.plist如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict><key>CFBundleDevelopmentRegion</key><string>$(DEVELOPMENT_LANGUAGE)</string><key>CFBundleDisplayName</key><string>Flutter App</string><key>CFBundleExecutable</key><string>$(EXECUTABLE_NAME)</string><key>CFBundleIdentifier</key><string>$(PRODUCT_BUNDLE_IDENTIFIER)</string><key>CFBundleInfoDictionaryVersion</key><string>6.0</string><key>CFBundleName</key><string>flutter_app_merchant_platform</string><key>CFBundlePackageType</key><string>APPL</string><key>CFBundleShortVersionString</key><string>$(FLUTTER_BUILD_NAME)</string><key>CFBundleSignature</key><string>????</string><key>CFBundleVersion</key><string>$(FLUTTER_BUILD_NUMBER)</string><key>LSRequiresIPhoneOS</key><true/><key>UILaunchStoryboardName</key><string>LaunchScreen</string><key>UIMainStoryboardFile</key><string>Main</string><key>UISupportedInterfaceOrientations</key><array><string>UIInterfaceOrientationPortrait</string><string>UIInterfaceOrientationLandscapeLeft</string><string>UIInterfaceOrientationLandscapeRight</string></array><key>UISupportedInterfaceOrientations~ipad</key><array><string>UIInterfaceOrientationPortrait</string><string>UIInterfaceOrientationPortraitUpsideDown</string><string>UIInterfaceOrientationLandscapeLeft</string><string>UIInterfaceOrientationLandscapeRight</string></array><key>UIViewControllerBasedStatusBarAppearance</key><false/><key>CADisableMinimumFrameDurationOnPhone</key><true/><key>UIApplicationSupportsIndirectInputEvents</key><true/><key>NSAppTransportSecurity</key><dict><key>NSAllowsArbitraryLoads</key><true/></dict>
</dict>
</plist>