為 AI 眼鏡建立第一個活動

<application>
  <activity
      android:name="com.example.xr.projected.GlassesMainActivity"
      android:exported="true"
      android:requiredDisplayCategory="xr_projected"
      android:label="Example AI Glasses activity">
      <intent-filter>
          <action android:name="android.intent.action.MAIN" />
      </intent-filter>
  </activity>
</application>

@OptIn(ExperimentalProjectedApi::class)
class GlassesMainActivity : ComponentActivity() {

    private var displayController: ProjectedDisplayController? = null
    private var isVisualUiSupported by mutableStateOf(false)
    private var areVisualsOn by mutableStateOf(true)
    private var isPermissionDenied by mutableStateOf(false)

    // Register the permissions launcher using the ProjectedPermissionsResultContract.
    private val requestPermissionLauncher: ActivityResultLauncher<List<ProjectedPermissionsRequestParams>> =
        registerForActivityResult(ProjectedPermissionsResultContract()) { results ->
            if (results[Manifest.permission.CAMERA] == true) {
                isPermissionDenied = false
                initializeGlassesFeatures()
            } else {
                // Handle permission denial.
                isPermissionDenied = true
            }
        }

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

        lifecycle.addObserver(object : DefaultLifecycleObserver {
            override fun onDestroy(owner: LifecycleOwner) {
                displayController?.close()
                displayController = null
            }
        })

        if (hasCameraPermission()) {
            initializeGlassesFeatures()
        } else {
            requestHardwarePermissions()
        }

        setContent {
            GlimmerTheme {
                HomeScreen(
                    areVisualsOn = areVisualsOn,
                    isVisualUiSupported = isVisualUiSupported,
                    isPermissionDenied = isPermissionDenied,
                    onRetryPermission = { requestHardwarePermissions() },
                    onClose = { finish() }
                )
            }
        }
    }

    private fun initializeGlassesFeatures() {
        lifecycleScope.launch {
            // Check device capabilities
            val projectedDeviceController = ProjectedDeviceController.create(this@GlassesMainActivity)
            isVisualUiSupported = projectedDeviceController.capabilities.contains(CAPABILITY_VISUAL_UI)

            val controller = ProjectedDisplayController.create(this@GlassesMainActivity)
            displayController = controller
            val observer = GlassesLifecycleObserver(
                context = this@GlassesMainActivity,
                controller = controller,
                onVisualsChanged = { visualsOn -> areVisualsOn = visualsOn }
            )
            lifecycle.addObserver(observer)
        }
    }

    private fun hasCameraPermission(): Boolean {
        return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) ==
                PackageManager.PERMISSION_GRANTED
    }

    private fun requestHardwarePermissions() {
        val params = ProjectedPermissionsRequestParams(
            permissions = listOf(Manifest.permission.CAMERA),
            rationale = "Camera access is required to overlay digital content on your physical environment."
        )
        requestPermissionLauncher.launch(listOf(params))
    }
}
GlassesMainActivity.kt

@Composable
fun HomeScreen(
    areVisualsOn: Boolean,
    isVisualUiSupported: Boolean,
    isPermissionDenied: Boolean,
    onRetryPermission: () -> Unit,
    onClose: () -> Unit,
    modifier: Modifier = Modifier
) {
    Box(
        modifier = modifier
            .surface(focusable = false)
            .fillMaxSize(),
        contentAlignment = Alignment.Center
    ) {
        if (isPermissionDenied) {
            Card(
                title = { Text("Permission Required") },
                action = { Button(onClick = onClose) { Text("Exit") } }
            ) {
                Text("Camera access is needed to use AI glasses features.")
                Button(onClick = onRetryPermission) { Text("Retry") }
            }
        } else if (isVisualUiSupported) {
            Card(
                title = { Text("Android XR") },
                action = {
                    Button(onClick = onClose) {
                        Text("Close")
                    }
                }
            ) {
                if (areVisualsOn) {
                    Text("Hello, AI Glasses!")
                } else {
                    Text("Display is off. Audio guidance active.")
                }
            }
        } else {
            Text("Audio Guidance Mode Active")
        }
    }
}
GlassesMainActivity.kt

val options = ProjectedContext.createProjectedActivityOptions(context)
val intent = Intent(context, GlassesMainActivity::class.java)
context.startActivity(intent, options.toBundle())
PhoneMainActivity.kt