使用CameraX拍摄视频

private fun openCamera() {
        cameraProviderFuture = ProcessCameraProvider.getInstance(this)//获得provider实例
        cameraProviderFuture.addListener({
            cameraProvider = cameraProviderFuture.get()
            bindPreview()
        }, ContextCompat.getMainExecutor(this))
    }
    @SuppressLint("RestrictedApi")
    private fun bindPreview(
    ) {
        val preview: Preview = Preview.Builder()
            .build()
        val cameraSelector: CameraSelector = CameraSelector.Builder()
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)
            .build()
        preview.setSurfaceProvider(previdew.surfaceProvider)
        videoCapture = VideoCapture.Builder()
            .setBitRate(1024 * 1024)
            .setVideoFrameRate(36)
            .setTargetRotation(previdew.display.rotation)
            .build()
        var camera = cameraProvider?.bindToLifecycle(
            this,
            cameraSelector,
            videoCapture,
            preview
        )
    }
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@SuppressLint("RestrictedApi", "MissingPermission")
    fun takeVideo() {
        val faceVideoFile = getExternalFilesDir("videoFile")?.also {
            if (it.exists()) {
                it.mkdirs()
            }
        }
        val destVideoFile = File(faceVideoFile, "${System.currentTimeMillis()}.mp4")
        val outFileOption = VideoCapture.OutputFileOptions.Builder(destVideoFile).build()
        videoCapture.startRecording(
            outFileOption,
            Executors.newSingleThreadExecutor(),
            object : VideoCapture.OnVideoSavedCallback {
                override fun onVideoSaved(outputFileResults: VideoCapture.OutputFileResults) {
                    lifecycleScope.launch(Dispatchers.Main) {
                        Toast.makeText(this@TakeVideoActivity, "拍摄成功", Toast.LENGTH_LONG).show()
                        startActivity(
                            Intent(
                                this@TakeVideoActivity,
                                ShowVideoActivity::class.java
                            ).apply {
                                putExtra("path", destVideoFile.absolutePath)
                            })
                    }
                }
                override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
                    lifecycleScope.launch(Dispatchers.Main) {
                        Toast.makeText(this@TakeVideoActivity, "拍摄失败", Toast.LENGTH_LONG).show()
                    }
                }
            })
    }
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videoCapture.stopRecording()
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@SuppressLint("RestrictedApi")
    override fun onDestroy() {
        super.onDestroy()
        cameraProvider?.shutdown()//必备的一步调用
    }
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.setBitRate(1024 * 1024)
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.setVideoFrameRate(100)
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.setTargetRotation(previdew.display.rotation)
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.setAudioBitRate(1024)
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.setTargetResolution(Size(300,200))
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val cameraSelector: CameraSelector = CameraSelector.Builder()
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)//设置后置摄像头，非自拍
//            .requireLensFacing(CameraSelector.LENS_FACING_FRONT)//设置前置摄像头，自拍
            .build()
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