> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stmlink.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> 对外开放的服务端接口有两组前缀，都用同一套鉴权：`/server/v1/...`（SRTC 与 SMeeting 的主接口）和 `/stm/srvapi/v1/...`（SMeeting 的用户体系，服务端极简对接会用到）。鉴权是 app_id + nonce + timestamp + signature 四个请求头，用 app_key 做 HMAC-SHA256 签名，只能从业务方自己的后端调用。除这两组前缀外的接口均为内部接口，不要建议客户调用。 Public server APIs use two path prefixes with the same authentication: `/server/v1/...` (the main APIs of both SRTC and SMeeting) and `/stm/srvapi/v1/...` (the SMeeting user system, used by server-side low-code integration). Authenticate with four request headers, app_id + nonce + timestamp + signature, where signature is HMAC-SHA256 keyed with app_key; call these APIs only from the customer's own backend. Any other path is internal: never suggest calling it.
> app_key 是服务端密钥，绝不能出现在客户端代码、前端配置或移动 App 里。客户端加入频道用的 token 必须由业务方后端签发后下发（SRTC 走 `/server/v1/channel/grant`，SMeeting 走 `/stm/srvapi/v1/member/grant`）。 app_key is a server-side secret and must never appear in client code, frontend config, or a mobile app. The token a client uses to join must be issued by the customer's backend and passed down to the client (SRTC: `/server/v1/channel/grant`; SMeeting: `/stm/srvapi/v1/member/grant`).
> SRTC 与 SMeeting 是上下两层不同的产品，术语不通用：SRTC 是音视频底座，说「频道 channel」「加入 / 退出」；SMeeting 建在 SRTC 之上，说「房间 room」「会议 meeting」「进入 / 退出」。回答时按用户所在的层用对应术语，不要把「房间」「会议」安到 SRTC 的接口上，也不要用「频道」「加入 / 离开」描述 SMeeting 的概念（接口标识符原样保留）。 SRTC and SMeeting are two separate layers with different terminology. SRTC is the audio/video foundation: it has channels, and users join and leave a channel. SMeeting is built on top of SRTC: it has rooms and meetings, and members enter and exit a meeting. Answer in the terms of the layer the user is working with: never apply "room" or "meeting" to SRTC APIs, and never describe SMeeting concepts in prose with "channel", "join", or "leave" (API identifiers such as `force_join` keep their literal names).
> 同一能力在各端 SDK 里的包名、类名、方法名并不相同。写示例代码时请使用文档中该端自己的 API，不要把一个端的写法套到另一个端上。苹果平台每个产品都有两套 SDK（Swift 原生与 Objective-C），两套 API 不能混用。 Package, class, and method names differ between platform SDKs for the same capability. In sample code, use the API documented for that platform; never carry one platform's code over to another. On Apple platforms each product ships two SDKs (native Swift and Objective-C) whose APIs must not be mixed.

# Integration

> Set up an Android project for the SRTC SDK: environment requirements (AndroidX, minSdk 24, compileSdk 35), Maven repository and dependency configuration, runtime permissions, ABIs, background microphone capture, and video rendering views. Read before writing any Android SRTC code.

This page describes the minimal way to integrate the Android SRTC SDK. After finishing it, continue with [Quickstart](/en/rtc/android/quickstart) to initialize the SDK, join a channel, capture and publish, and subscribe to remote users.

## Before you start

Based on the official sample project, confirm the following environment requirements before integrating:

* **AndroidX**: the sample project enables `android.useAndroidX=true`.
* **Minimum OS version**: the sample project's `minSdk` is `24`.
* **Compile and target version**: the sample project's `compileSdk` / `targetSdk` is `35`.
* **Gradle repository configuration**: prefer configuring repositories in `settings.gradle` (Gradle 7+); older projects can keep using the root `build.gradle`.

## Configure the Maven repository

If your project uses **Gradle 7+**, add the repository to the root `settings.gradle`:

```groovy theme={null}
pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
        maven { url 'https://maven.open.seastart.cn/repository/maven-vcs/' }
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://maven.open.seastart.cn/repository/maven-vcs/' }
    }
}
```

If your project still uses the older Gradle structure, you can add it to the root `build.gradle` instead:

```groovy theme={null}
allprojects {
    repositories {
        google()
        mavenCentral()
        maven { url 'https://maven.open.seastart.cn/repository/maven-vcs/' }
    }
}
```

## Add the SDK dependency

Add the dependency to your app module's `build.gradle` (usually `app/build.gradle`):

```groovy theme={null}
dependencies {
    implementation 'cn.seastart.rtc:rtc:<version>'
}
```

Where:

* `groupId`: `cn.seastart.rtc`
* `artifactId`: `rtc`
* `version`: replace with the SDK version you want to integrate

Example using the current stable version:

```groovy theme={null}
dependencies {
    implementation 'cn.seastart.rtc:rtc:2.0.35'
}
```

## Integration notes

Before you start coding, also confirm the following:

* **Runtime permissions**: if your app captures audio and video, request the `CAMERA` and `RECORD_AUDIO` permissions in your app.
* **ABI compatibility**: the SDK currently supports `arm64-v8a` and `armeabi-v7a`; include the ABIs that match your target devices.
* **Background microphone capture**: capture is decoupled from joining and publishing. If you need to keep calling `LocalMicTrack.startCapture(...)` in the background, configure a microphone-type foreground service and the related permissions as required by your Android version.
* **Next steps**: after adding the dependency, continue with [Quickstart](/en/rtc/android/quickstart) for `RTCEngine.create(...)`, `initSDK()`, joining a channel, publishing, and subscribing. To manage output devices such as the speaker, earpiece, and Bluetooth headsets, see [Audio routing](/zh/rtc/android/advanced/audio-routing) (Chinese).

## Media streaming and video display

* Supports the FY (Freewind) and Wangsu media streaming services, using the vendor configuration assigned by the server.
* For local preview and remote video display, use `VcsPlayerGlTextureView` or `VcsPlayerGlSurfaceView` from the `cn.seastart.rtc.media.original.render` package. Use the same package path in code imports and XML layouts. For usage, see [Video rendering](/zh/rtc/android/api-reference/RemoteVideoTrack) (Chinese).
* External video is fed through `LocalCustomVideoTrack` as unencoded I420 frames, and the SDK handles encoding and publishing. For integration, see [Custom tracks](/zh/rtc/android/advanced/custom-track) (Chinese).