Android CameraX Not bound to a valid Camera

造成这个原因的是

imageCapture没有与相机设备进行绑定，下面是绑定的代码

val cameraProviderFuture: ListenableFuture<ProcessCameraProvider> = ProcessCameraProvider.getInstance(this)
val processCameraProvider = cameraProviderFuture.get()
processCameraProvider.bindToLifecycle(this, CameraSelector.DEFAULT_BACK_CAMERA, imageCapture)

本人所写的点击事件和初始化捕获的全部代码如下

//拍照
private fun onClick(){
    val imagePath = Environment.getExternalStorageDirectory().absolutePath +"/downloads/test.jpg"
    val file:File = File(imagePath);
    val outputFileOptions = ImageCapture.OutputFileOptions.Builder(file).build()
    //绑定摄像机
    imageCapture!!.takePicture(outputFileOptions, ContextCompat.getMainExecutor(this),
        object : ImageCapture.OnImageSavedCallback {
            override fun onError(error: ImageCaptureException)
            {
                error.printStackTrace()
            }
            override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {

            }
        })
}

//捕获初始化
private fun capturePicture(){
    imageCapture = ImageCapture.Builder()
        .setCaptureMode(ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY)
        .build()
    cameraProvider?.bindToLifecycle(lifecycleOwner!!,cameraSelector!!,
    imageCapture,imageAnalysis,preview)
    val cameraProviderFuture: ListenableFuture<ProcessCameraProvider> = ProcessCameraProvider.getInstance(this)
    val processCameraProvider = cameraProviderFuture.get()
    processCameraProvider.bindToLifecycle(this, CameraSelector.DEFAULT_BACK_CAMERA, imageCapture)
}