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[已解決][Flutter] Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:camera]

問題描述

在 Flutter 如何使用照相機的官方教學文件中，提到若是在 Android 系統中透過 Flutter 調用照相機，其最低 SDK 版本（min-sdk-version）必須高於 21 才行。

否則的話，在調用照相機的過程中便會出現以下報錯（也就是我今天遇到的問題）：

Execution failed for task ':app:processDebugMainManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:camera] /Users/clay/Projects/FlutterProjects/flutter_medication_reminder/build/camera/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 21,
  		or use tools:overrideLibrary="io.flutter.plugins.camera" to force usage (may lead to runtime failures)

解決方法

為了解決這個問題，我們必須修改 Flutter 專案中 Android 的最低 SDK 版本。

在 Flutter 專案中，我們要修改的文件路徑為 PROJECT_NAME/android/app/build.gradle。文件應該有著以下內容：

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 30

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.clayatlas.flutter_project"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}



可以發現，目前在 defaultConfig 底下的 minSdkVersion 設定為 16，跟報錯訊息提供的一致。應將其修改為 21（或任何你需要的版本號）。

我在調整過最低版本號之後，便能成功執行在 Flutter 專案中調用照相機的程式。

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