添加flutter_paypal SDK后Flutter项目构建失败的问题咨询

遇到的错误 #

错误1：compileSdkVersion版本不足 #

One or more plugins require a higher Android SDK version.
Fix this issue by adding the following to D:\MyApplication\Application\application\android\app\build.gradle:
android {
  compileSdkVersion 32
  ...
}

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
   > The minCompileSdk (32) specified in a
     dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
     is greater than this module's compileSdkVersion (android-31).
     Dependency: androidx.webkit:webkit:1.5.0.
     AAR metadata file: C:\Users\MyPc\.gradle\caches\transforms-2\files-2.1\1e17c3cecd51956dd096ba6a3522bf2f\webkit-1.5.0\META-INF\com\android\build\gradle\aar-metadata.properties.

错误2：minSdkVersion版本冲突 #

D:\MyApplication\Application\application\android\app\src\debug\AndroidManifest.xml Error:
    uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared in library [:webview_flutter_android] D:\MyApplication\Application\application\build\webview_flutter_android\intermediates\library_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 19,
        or use tools:overrideLibrary="io.flutter.plugins.webviewflutter" to force usage (may lead to runtime failures)

为什么Manifest中没有uses-sdk:minSdkVersion却出现该错误？ #

Flutter项目的Android SDK版本配置默认在android/app/build.gradle中定义，而非直接写入AndroidManifest.xml。Gradle构建时会自动将build.gradle里的minSdkVersion、compileSdkVersion等配置注入到Manifest文件中，所以即使你没手动添加uses-sdk标签，项目实际的minSdk版本仍由build.gradle的配置决定。

解决步骤 #

1. 打开项目中的android/app/build.gradle文件
2. 在android代码块中修改版本配置，同步依赖要求：

android {
    compileSdkVersion 32

    defaultConfig {
        // 保留原有applicationId、versionCode等配置
        minSdkVersion 19
        targetSdkVersion 32
    }
}

3. 点击Android Studio右上角的Sync Now按钮，同步Gradle配置
4. 重新运行Flutter应用

说明 #

• compileSdkVersion必须与依赖库要求的最低编译版本一致（此处依赖的androidx.webkit:webkit:1.5.0要求32）
• minSdkVersion需提升至所有依赖库要求的最低版本以上（此处webview_flutter_android要求至少19），避免API不兼容导致运行时崩溃
• 不建议使用tools:overrideLibrary强制忽略版本冲突，这会带来潜在的运行时风险

内容的提问来源于stack exchange，提问作者Stack Overflow