Sample App Guide

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

1. Create an Android Studio app project. 2. Add the DAT Maven repository and dependencies. 3. Configure AndroidManifest.xml for registration callbacks and APPLICATION_ID. 4. 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 stream: Stream? = null

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

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

Observe frames and capture photos

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

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

Shutdown

fun stopCameraSession() {
    stream?.stop()
    session?.stop()
    stream = 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.

Links

• CameraAccess sample
• Android integration guide
• Developer documentation