Android Room错误:带@Relation注释的字段必须是列表或集合 [英] Android Room Error: Fields annotated with @Relation must be a List or Set

问题描述

我想在2.2.0-alpha1版本的房间中使用一对一关系.我当前的房间版本是2.2.5，但出现错误:

I want to use One to One relationship in room that available from version 2.2.0-alpha1. My current room version 2.2.5 and I get an error:

error: Fields annotated with @Relation must be a List or Set.

推荐答案

自androidx以来，android名称有所变化.

There is change in android name since androidx.

请确保在应用中使用androidx而不是arch(已弃用)

Make sure to use androidx instead of arch(deprecated) in app

def room_version = "2.2.5"

implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"

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