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Flutter 开发出现的那些 Bugs 和解决方案「持续更新... 」


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:

// 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"

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。

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:

✗ 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)

可以在 ​​android/local.properties​​ 文件中添加内容:

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:

// 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:

✓  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


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