private lateinit var surfaceHolder: SurfaceHolder

        val cameraManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
        val surfaceView = findViewById<SurfaceView>(R.id.surfaceView)
        surfaceHolder = surfaceView.holder
        surfaceHolder.setKeepScreenOn(true)
        surfaceHolder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(p0: SurfaceHolder) {
                if (ActivityCompat.checkSelfPermission(
                        this@SurfaceActivity,
                        Manifest.permission.CAMERA
                    ) != PackageManager.PERMISSION_GRANTED
                ) {
                    //無(wú)相機(jī)權(quán)限
                    return
                }
                try {
                    //獲取可用相機(jī)設(shè)備列表
                    val cameraIdList = cameraManager.cameraIdList
                    //打開(kāi)相機(jī)
                    cameraManager.openCamera(
                        cameraIdList[0],
                        //攝像頭創(chuàng)建監(jiān)聽(tīng)
                        object : CameraDevice.StateCallback() {
                            override fun onOpened(p0: CameraDevice) { //打開(kāi)攝像頭
                                try {
                                    startPreview(p0)
                                } catch (e: CameraAccessException) {
                                    e.printStackTrace()
                                }
                            }
                            override fun onDisconnected(p0: CameraDevice) { //關(guān)閉攝像頭
                                p0.close()
                            }
                            override fun onError(p0: CameraDevice, p1: Int) {
                                Log.i(tag, "CameraDevice.StateCallback onError")
                            }
                        },
                        null
                    )
                } catch (e: CameraAccessException) {
                    e.printStackTrace()
                }
            }
            override fun surfaceChanged(p0: SurfaceHolder, p1: Int, p2: Int, p3: Int) {
                Log.i(tag, "surfaceChanged")
            }
            override fun surfaceDestroyed(p0: SurfaceHolder) {
                Log.i(tag, "surfaceDestroyed")
            }
        })

    private fun startPreview(cameraDevice: CameraDevice) {
        val captureRequest = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
        captureRequest.addTarget(surfaceHolder.surface)
        cameraDevice.createCaptureSession(
            listOf(surfaceHolder.surface),
            //會(huì)話(huà)狀態(tài)回調(diào)
            object : CameraCaptureSession.StateCallback() {
                override fun onConfigured(p0: CameraCaptureSession) {
                    try {
                        // 創(chuàng)建預(yù)覽需要的CaptureRequest.Builder
                        val previewRequestBuilder =
                            cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
                        previewRequestBuilder.addTarget(surfaceHolder.surface)
                        val previewRequest = previewRequestBuilder.build()
                        p0.setRepeatingRequest(previewRequest, null, null)
                    } catch (e: CameraAccessException) {
                        e.printStackTrace()
                    }
                }
                override fun onConfigureFailed(p0: CameraCaptureSession) {
                    Log.i(tag, "onConfigureFailed")
                }
            }, null
        )
    }

        val textureView = findViewById<TextureView>(R.id.textureView)
        val mediaPlayer = MediaPlayer()
        textureView.surfaceTextureListener = object : TextureView.SurfaceTextureListener {
            override fun onSurfaceTextureAvailable(p0: SurfaceTexture, p1: Int, p2: Int) {
                with(mediaPlayer) {
                    setDataSource(GlobalData.videoUrl)
                    setSurface(Surface(p0))
                    prepare()
                    start()
                    Log.i(tag, "setOnPreparedListener")
                    setOnPreparedListener {
                        it.start()
                    }
                }
            }
            override fun onSurfaceTextureSizeChanged(p0: SurfaceTexture, p1: Int, p2: Int) {
            }
            override fun onSurfaceTextureDestroyed(p0: SurfaceTexture): Boolean {
                mediaPlayer.stop()
                mediaPlayer.release()
                return true
            }
            override fun onSurfaceTextureUpdated(p0: SurfaceTexture) {
            }
        }