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记载 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 过错 on vscode

上面是 VSCode 编辑器中空校验过错。解决方案如下：

// vscode 编辑器项目根目录中创建文件 .vscode/launch.json
// 增加内容
"args": [
  "--no-sound-null-safety"
]
// 完好的文件代码示例
{
  "configurations":[
    {
      "name": "jimmy flutter demo",
      "program": "lib/main.dart",
      "request": "launch",
      "type": "dart",
      "args": [
        "--no-sound-null-safety"
      ]
    }
  ]
}
// 之后从头运行项目即可

2. 设置 flutter_screenutil 报错

直接引用包 flutter_screenutil 去运用，会报错运用不了 ScreenUtil().setWidth(width) 等方法。

这个过错就是咱们并没有依照官网进行运用。需求依据官网逐步进行。

这儿我运用方法一 — 在app中运用它一次。

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度,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. 构建安卓使用包出错

在使用开发完成之后，构建安卓的图标文件，可能会呈现报错：

✗ 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.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:32)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

能够在 android/local.properties 文件中增加内容：

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

在使用开发完成之后，针对安卓使用去打包，可能会呈现报错：

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

这是由于 minSdkVersion 的问题，咱们更改下相关的文件版别即可：

// 解决方案
// android/app/build.gradle
defaultConfig {
        // // TODO: Specify your own unique Application ID (https://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: https://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 // 更改最小的版别
        targetSdkVersion 31
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

假如构建成功，你会看到输出目录提示内容类似下面：

✓  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… 欢迎重视保藏

往期精彩引荐

  • Dart 知识点 – 数据类型
  • Dart 知识点 – 运算符

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