Sample App Guide Agent Skill

by facebook

Building a complete DAT app with session creation, camera streaming, and photo capture

805 tokens

context cost

SKILL.md, read when the skill is used

files

instructions only

copies elsewhere

how many repositories repackaged it

339

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/facebook/meta-wearables-dat-android --skill sample-app-guide

The instruction itself

8 sections, as written by the author

Sample App Guide (Android)

Build an Android DAT app with registration, sessions, camera streaming, and photo capture.

Pair this with the CameraAccess sample.

Project setup

Create an Android Studio app project.
Add the DAT Maven repository and dependencies.
Configure AndroidManifest.xml for registration callbacks plus APPLICATION_ID and CLIENT_TOKEN.
Initialize Wearables in your Application.

Suggested app structure

app/src/main/java/com/example/myapp/
├── MyApplication.kt
├── MainActivity.kt
├── session/
│   └── SessionViewModel.kt
└── ui/
    ├── RegistrationScreen.kt
    └── CameraScreen.kt

Registration and session creation

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        lifecycleScope.launch {
            Wearables.registrationState.collect { state ->
                // Update registration UI
            }
        }
    }

    fun register() {
        Wearables.startRegistration(this)
    }
}

class SessionViewModel : ViewModel() {
    private var session: Session? = null
    private var camera: Camera? = null

    fun startCameraSession() {
        val createdSession = Wearables.createSession(AutoDeviceSelector()).getOrElse { error ->
            throw IllegalStateException(error.description)
        }
        createdSession.start()
        session = createdSession

        camera = createdSession.addCamera(
            StreamConfiguration(videoQuality = VideoQuality.MEDIUM, frameRate = 24),
        ).getOrElse { error ->
            throw IllegalStateException(error.description)
        }.also { addedCamera ->
            addedCamera.stream.start().getOrElse { error ->
                throw IllegalStateException(error.description)
            }
        }
    }
}

Observe frames and capture photos

viewModelScope.launch {
    camera?.stream?.videoStream?.collect { frame ->
        // Render preview
    }
}

fun capturePhoto() {
    viewModelScope.launch {
        camera?.stream?.capturePhoto()
            ?.onSuccess { photoData ->
                savePhoto(photoData.data)
            }
            ?.onFailure { error, _ ->
                showCaptureError(error.description)
            }
    }
}

Shutdown

fun stopCameraSession() {
    camera?.stop()
    session?.stop()
    camera = null
    session = null
}

Testing with MockDeviceKit

Use MockDeviceKit to simulate linking glasses, permission state, and camera media without physical hardware. See MockDevice Testing for setup details.

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How to use it

Copy the folder

Take facebook/meta-wearables-dat-android-sample-app-guide from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

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