android build_error ai_generated true

错误：未向注解处理器提供架构导出目录，因此无法导出架构。您可以提供 `room.schemaLocation` 注解处理器参数，或将 exportSchema 设置为 false。

error: Schema export directory is not provided to the annotation processor so we cannot export the schema. You can either provide `room.schemaLocation` annotation processor argument OR set exportSchema to false.

ID: android/room-schema-export-missing

其他格式: JSON · Markdown 中文 · English
95%修复率
86%置信度
1证据数
2023-02-01首次发现

版本兼容性

版本状态引入弃用备注
Room 2.5 - 2.6 active — — —
Android Gradle Plugin 7.4 - 8.2 active — — —

根因分析

Room 数据库注解处理器需要架构导出目录以进行迁移验证，但未在 build.gradle 中配置，或者 exportSchema 设置为 true 但未提供路径。

English

Room database annotation processor requires a schema export directory for migration validation, but it is not configured in build.gradle or exportSchema is set to true without a path.

generic

官方文档

https://developer.android.com/training/data-storage/room/migrating#export-schema

解决方案

  1. Add the following to build.gradle (app-level) for kapt: 'kapt { arguments { arg("room.schemaLocation", "$projectDir/schemas") } }' or for annotationProcessor: 'defaultConfig { javaCompileOptions { annotationProcessorOptions { arguments = ["room.schemaLocation": "$projectDir/schemas"] } } }'
  2. Set exportSchema = false in the @Database annotation if migration validation is not needed: '@Database(entities = [User::class], version = 1, exportSchema = false)'

无效尝试

常见但无效的做法:

  1. 50% 失败

    If exportSchema is false, the schema is not exported, but the error may still occur if the processor expects the argument; the build.gradle configuration is still needed.

  2. 50% 失败

    The path must be a valid project-relative directory; a wrong path causes the processor to fail silently or create the schema in an unexpected location.