如何设置CameraX (安卓)5秒后停止录制？

dependencies {
    def camerax_version = "1.1.0-alpha07"
    implementation "androidx.camera:camera-camera2:$camerax_version"
    implementation "androidx.camera:camera-lifecycle:$camerax_version"
    implementation "androidx.camera:camera-view:1.0.0-alpha24"
}

<androidx.camera.view.PreviewView
    android:id="@+id/previewView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<Button
    android:id="@+id/recordButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Record" />

private lateinit var camera: Camera
private lateinit var videoCapture: VideoCapture
private lateinit var recordButton: Button
private var isRecording = false

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val previewView = findViewById<PreviewView>(R.id.previewView)
    recordButton = findViewById<Button>(R.id.recordButton)

    // 初始化CameraX
    val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
    cameraProviderFuture.addListener({
        val cameraProvider = cameraProviderFuture.get()

        // 创建预览用例
        val preview = Preview.Builder().build().also {
            it.setSurfaceProvider(previewView.surfaceProvider)
        }

        // 创建视频录制用例
        videoCapture = VideoCapture.Builder().build()

        // 选择后置摄像头
        val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA

        try {
            // 解绑之前的用例
            cameraProvider.unbindAll()

            // 绑定预览和录制用例到相机
            camera = cameraProvider.bindToLifecycle(this, cameraSelector, preview, videoCapture)

            // 设置录制按钮点击事件
            recordButton.setOnClickListener {
                if (isRecording) {
                    stopRecording()
                } else {
                    startRecording()
                }
            }
        } catch (exc: Exception) {
            Log.e(TAG, "无法绑定相机用例", exc)
        }
    }, ContextCompat.getMainExecutor(this))
}

private fun startRecording() {
    // 创建保存视频的文件
    val videoFile = File(externalMediaDirs.first(), "${System.currentTimeMillis()}.mp4")

    // 开始录制
    videoCapture.startRecording(videoFile, Executors.newSingleThreadExecutor(), object : VideoCapture.OnVideoSavedCallback {
        override fun onVideoSaved(outputFileResults: VideoCapture.OutputFileResults) {
            Log.d(TAG, "视频已保存：${outputFileResults.savedUri}")
        }

        override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
            Log.e(TAG, "录制视频时出错：$message", cause)
        }
    })

    recordButton.text = "Stop"
    isRecording = true

    // 5秒后停止录制
    Handler(Looper.getMainLooper()).postDelayed({
        stopRecording()
    }, 5000)
}

private fun stopRecording() {
    // 停止录制
    videoCapture.stopRecording()

    recordButton.text = "Record"
    isRecording = false
}