定义仓储接口
公开数据需求而不泄露 HTTP 细节
定义仓储接口 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Kotlin Multiplatform Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Kotlin Multiplatform Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
What a Repository Is
A repository is the single doorway your apps walk through to get data, hiding where that data actually comes from.
Start With an Interface
Define the repository as a Kotlin interface first, so callers depend on a contract instead of a concrete class.
interface UserRepository {
suspend fun getUser(id: String): User
}Speak in Domain Terms
Name methods after what the app needs, like getUser, not after how you fetch it. The intent stays clear and stable.
Return Domain Models
The interface returns clean domain models, never raw JSON or HTTP responses, so the UI stays simple.
suspend fun getUsers(): List<User>No HTTP Words Allowed
Keep words like Ktor, headers, and status codes out of the interface. Callers should never know HTTP exists.
Suspend for Async Work
Mark data methods as suspend so they can do async work without blocking, and fit naturally into coroutines on both apps.
suspend fun refresh()It Lives in commonMain
Put the interface in commonMain so Android and iOS share the exact same data contract with zero duplication.
Many Implementations Possible
One interface can have several implementations: a real network one and a fake one for tests, swapped freely.
Easier to Test
Because callers depend on the interface, you can inject a fake repository in tests and avoid hitting the real network.
class FakeUserRepository : UserRepositoryClear, Focused Methods
Keep each method small and purposeful. A focused API is easier to read, mock, and evolve over time.
A Complete Example
Here is a tidy repository contract that exposes everything the user feature needs and nothing more.
interface UserRepository {
suspend fun getUsers(): List<User>
suspend fun getUser(id: String): User
}Quick Check
Where should the repository interface live in a KMP project?
Recap
A repository interface in commonMain defines what data the app needs using suspend methods and domain models, hiding all HTTP details.
常见问题解答
「定义仓储接口」课时是免费的吗？
是的 — 「定义仓储接口」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Kotlin Multiplatform Academy 课程的其余内容，请升级到 CoddyKit PRO。 Kotlin Multiplatform Academy 课程共包含 4 节课。
「定义仓储接口」这节课中我会学到什么？
公开数据需求而不泄露 HTTP 细节 你通过在浏览器中直接运行的动手代码来练习 Kotlin Multiplatform Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Kotlin Multiplatform Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Kotlin Multiplatform Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。
「定义仓储接口」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Kotlin Multiplatform Academy 课中编写并运行代码吗？
能。每节 Kotlin Multiplatform Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。