Flutter编译时出现第三方依赖Deprecated Apis警告该如何消除？

问题告警日志 #

Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-1.6.0\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\cloud_firestore-2.5.1\android\src\main\java\io\flutter\plugins\firebase\firestore\FlutterFirebaseFirestorePlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\cloud_firestore-2.5.1\android\src\main\java\io\flutter\plugins\firebase\firestore\streamhandler\TransactionStreamHandler.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.                      
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-3.1.0\android\src\main\java\io\flutter\plugins\firebase\auth\FlutterFirebaseAuthPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_storage-10.0.3\android\src\main\java\io\flutter\plugins\firebase\storage\FlutterFirebaseStoragePlugin.java:38: warning: [deprecation] Registrar in PluginRegistry has been deprecated
  public static void registerWith(PluginRegistry.Registrar registrar) {
                                                ^
1 warning                                                               
Note: Some input files use or override a deprecated API.                
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\geocoding-2.0.1\android\src\main\java\com\baseflow\geocoding\GeocodingPlugin.java uses 
or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker-0.8.4\android\src\main\java\io\flutter\plugins\imagepicker\ImagePickerDelegate.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

这些警告均来自第三方Flutter依赖的Android原生层代码，属于依赖包本身的代码兼容问题，而非本地项目代码错误。升级依赖后仍存在警告可按以下步骤操作：

方法1：清理pub缓存与项目构建缓存 #

• 清理全局pub缓存，执行命令：
  flutter pub cache clean
• 进入你的Flutter项目根目录，删除以下文件/文件夹：
  • pubspec.lock 依赖锁定文件
  • .dart_tool 项目dart临时构建目录
• 重新拉取项目依赖：
  flutter pub get
• 进入项目android子目录，清理Android构建缓存：
  Windows系统执行：gradlew clean
  Mac/Linux系统执行：./gradlew clean
• 重新编译项目，检查警告是否消除。

方法2：清理缓存后警告仍存在的处理方案 #

如果清理后警告仍然存在，说明是对应依赖包的当前版本本身就存在废弃API调用问题，并非缓存导致，你可以通过配置gradle临时屏蔽这类不影响运行的编译警告：
打开项目android/build.gradle文件，在allprojects配置块中添加如下配置：

allprojects {
    // 保留原有其他配置不变，新增以下内容
    gradle.projectsEvaluated {
        tasks.withType(JavaCompile) {
            options.compilerArgs += "-Xlint:-deprecation"
            options.compilerArgs += "-Xlint:-unchecked"
        }
    }
}

保存后重新编译即可消除这类警告输出。如果需要彻底修复问题，需要等待对应依赖的官方发布修复了废弃API兼容问题的版本再升级。

内容的提问来源于stack exchange，提问作者Rafik Frtas