VS Code开发Flutter：如何配置Gradle的-Xlint:deprecation查看废弃API详情？

在VS Code中开发Flutter应用时，遇到如下编译警告：

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

尝试多种配置后，仍无法定位到具体是哪部分代码使用了废弃API。以下是当前android/app/build.gradle的配置代码：

plugins {
    id "com.android.application"
    id "kotlin-android"
    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
    id "dev.flutter.flutter-gradle-plugin"

    id 'com.google.gms.google-services'    
}

android {
    namespace = "testxxxx"
    compileSdk = flutter.compileSdkVersion
    ndkVersion = flutter.ndkVersion

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }    
    
    allprojects {
        gradle.projectsEvaluated {
            tasks.withType(JavaCompile) {
                // options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
                options.compilerArgs += ["-Xlint:deprecation"]
            }
        }
    }

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_1_8
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId = "com.test.testxxx"
        // You can update the following values to match your application needs.
        // For more information, see: https://flutter.dev/to/review-gradle-config.
        minSdkVersion = 23
        // minSdk = flutter.minSdkVersion

        targetSdk = flutter.targetSdkVersion
        versionCode = flutter.versionCode
        versionName = flutter.versionName
    }

    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 {
  // Import the Firebase BoM
  implementation platform('com.google.firebase:firebase-bom:33.2.0')

  // TODO: Add the dependencies for Firebase products you want to use
  // When using the BoM, don't specify versions in Firebase dependencies
  implementation 'com.google.firebase:firebase-analytics'

  // Add the dependencies for any other desired Firebase products
  // https://firebase.google.com/docs/android/setup#available-libraries
}

解决方案 #

正确配置-Xlint:deprecation参数的方式是修改Flutter项目根目录下的android/build.gradle文件，添加以下内容：

allprojects {
    repositories {
        google()
        mavenCentral()
    }

    // 添加编译器参数
    gradle.projectsEvaluated {
        tasks.withType(JavaCompile) {                        
            // "-Werror"会将所有警告（比如-Xlint:deprecation或-Xlint:unchecked生成的警告）视为错误，导致构建失败
            options.compilerArgs += ["-Xlint:deprecation", "-Xlint:unchecked"]             
        }

        // 目前不确定这部分是否生效，暂时保留
        tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
            kotlinOptions {
                freeCompilerArgs += ["-Xlint:deprecation"]
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者cealex