机遇屋-flutter 错误：uses-sdk：minSdkVersion 16 不能小于库中声明的版本20

flutter 错误：uses-sdk：minSdkVersion 16 不能小于库中声明的版本20

作者：ych

### 介绍
报错信息
flutter 错误：uses-sdk：minSdkVersion 16 不能小于库中声明的版本20
```
E:\code\flutter\debug\AndroidManifest.xml Error:
	uses-sdk:minSdkVersion 16 cannot be smaller than version 20 declared in library [:qr_code_scanner] E:\code\flutter\build\qr_code_scanner\intermediates\merged_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
	Suggestion: use a compatible library with a minSdk of at most 16,
		or increase this project's minSdk version to at least 20,
		or use tools:overrideLibrary="net.touchcapture.qr.flutterqr" to force usage (may lead to runtime failures)

E:\code\flutter\build\qr_code_scanner\intermediates\merged_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
  	Suggestion: use a compatible library with a minSdk of at most 16,
  		or increase this project's minSdk version to at least 20,
  		or use tools:overrideLibrary="net.touchcapture.qr.flutterqr" to force usage (may lead to runtime failures)
```

### 解决方案

打开这个文件`android/app/build.gradle`
In your app Navigate to`android/app/build.gradle`
```
    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.flutter_test2"
        // 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
    }
```

minSdkVersion版本改为20
change minsdk from 16 to 20

```
defaultConfig {
    // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
    minSdkVersion 16 // change it to 20
}
```

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flutter 错误：uses-sdk：minSdkVersion 16 不能小于库中声明的版本20

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