[CameraX预览在选择前置摄像头时不显示任何内容

Question

我正在尝试使用CameraX库通过前置摄像头捕获图像。但是当启动相机时，预览只显示黑屏。这是配置：

val previewConfig = PreviewConfig.Builder().apply {
            setTargetResolution(Size(640, 480))
            setLensFacing(CameraX.LensFacing.FRONT)
        }.build()

        preview = Preview(previewConfig)

        preview.setOnPreviewOutputUpdateListener {
            val parent = viewFinder.parent as ViewGroup
            parent.removeView(viewFinder)
            parent.addView(viewFinder, 0)

            viewFinder.surfaceTexture = it.surfaceTexture
            updateTransform()
        }

        val imageCaptureConfig = ImageCaptureConfig.Builder()
            .apply {
                setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
            }.build()

        imageCapture = ImageCapture(imageCaptureConfig)

        val analyzerConfig = ImageAnalysisConfig.Builder().apply {
            setImageReaderMode(
                ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE)
        }.build()

        analyzerUseCase = ImageAnalysis(analyzerConfig).apply {
            setAnalyzer(executor, LuminosityAnalyzer())
        }
        CameraX.bindToLifecycle(this, preview, imageCapture)

但是它与setLensFacing(CameraX.LensFacing.BACK)配合良好。另外，如果我从bindToLifeCyle方法中删除ImageCapture对象，则可以看到前置摄像头的预览。

CameraX.bindToLifecycle(this, preview, /*imageCapture*/)

请告知。

Answer 1

您还需要将setLensFacing设置为imageCaptureConfig的最前面。我也遇到了同样的问题，但是您的问题解决了我的问题：p