Flutter 开发出现的那些 Bugs 和解决方案「持续更新... 」

语言: CN / TW / HK

携手创作,共同成长!这是我参与「掘金日新计划 · 8 月更文挑战」的第4天,点击查看活动详情

记录 Flutter 开发过程中遇到的一些问题和相关的解决方案~

1. --no-sound-null-safety 错误 on vscode

上面是 VSCode 编辑器中空校验错误。解决方案如下:

```bash // vscode 编辑器项目根目录中创建文件 .vscode/launch.json // 添加内容 "args": [ "--no-sound-null-safety" ]

// 完整的文件代码示例 { "configurations":[ { "name": "jimmy flutter demo", "program": "lib/main.dart", "request": "launch", "type": "dart", "args": [ "--no-sound-null-safety" ] } ] }

// 之后重新运行项目即可 ```

2. 设置 flutter_screenutil 报错

直接引用包 flutter_screenutil 去使用,会报错使用不了 ScreenUtil().setWidth(width) 等方法。

这个错误就是我们并没有按照官网进行使用。需要根据官网逐步进行。

这里我使用方式一 -- 在app中使用它一次。

```bash void main() => runApp(MyApp());

class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { //填入设计稿中设备的屏幕尺寸,单位dp return ScreenUtilInit( designSize: const Size(360, 690), minTextAdapt: true, splitScreenMode: true, builder: (context , child) { return MaterialApp( debugShowCheckedModeBanner: false, title: 'First Method', // You can use the library anywhere in the app even in theme theme: ThemeData( primarySwatch: Colors.blue, textTheme: Typography.englishLike2018.apply(fontSizeFactor: 1.sp), ), home: child, ); }, child: const HomePage(title: 'First Method'), ); } } ```

3. 构建安卓应用包出错

在应用开发完成之后,构建安卓的图标文件,可能会出现报错:

```bash ✗ ERROR: InvalidConfigException Cannot not find minSdk from android/app/build.gradle or android/local.propertiesSpecify minSdk in either android/app/build.gradle or android/local.properties

0 createIconsFromConfig (package:flutter_launcher_icons/main.dart:96:7)

1 createIconsFromArguments (package:flutter_launcher_icons/main.dart:60:7)

2 main (file:///Users/jimmy/Documents/sdk/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_launcher_icons-0.9.3/bin/main.dart:7:26)

3 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:295:32)

4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

```

可以在 android/local.properties 文件中添加内容:

bash flutter.versionName=1.0.0 flutter.versionCode=1 flutter.minSdkVersion=30

在应用开发完成之后,针对安卓应用去打包,可能会出现报错:

Execution failed for task ':app:processReleaseMainManifest'. Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library

这是因为 minSdkVersion 的问题,我们更改下相关的文件版本即可:

```bash // 解决方案 // android/app/build.gradle

defaultConfig { // // TODO: Specify your own unique Application ID (http://developer.android.com/studio/build/application-id.html). // applicationId "com.example.jimmy_flutter_demo" // // You can update the following values to match your application needs. // // For more information, see: http://docs.flutter.dev/deployment/android#reviewing-the-build-configuration. // minSdkVersion flutter.minSdkVersion // targetSdkVersion flutter.targetSdkVersion // versionCode flutterVersionCode.toInteger() // versionName flutterVersionName

    applicationId "com.example.jimmy_flutter_demo"
    minSdkVersion 21 // 更改最小的版本
    targetSdkVersion 31
    versionCode flutterVersionCode.toInteger()
    versionName flutterVersionName
    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

```

如果构建成功,你会看到输出目录提示内容类似下面:

bash ✓ Built build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk (7.5MB).

目前暂时遇到这些 Bug,后续会持续更新... 欢迎关注收藏

往期精彩推荐

如果读者觉得文章还可以,不防一键三连:关注➕点赞➕收藏