使用不带TextureView的ImageReader时，Camera2 API自动对焦不起作用

Question

使用ImageReader获取最新图像（Camera 2 API）时，如果我将TextureView用作表面，则ImageReader会获得具有自动聚焦的输出图像。 但是，如果没有TextureView作为曲面，则自动对焦不起作用（在ImageReader上获得模糊的图像）。 为什么将TextureView作为表面会影响自动对焦？

  surfaceTexture = textureView.surfaceTexture
  surfaceTexture!!.setDefaultBufferSize(mPreviewSize!!.width, mPreviewSize!!.height)
  // This is the output Surface we need to start preview.
  val surface = Surface(surfaceTexture)

  // We set up a CaptureRequest.Builder with the output Surface.
  mPreviewRequestBuilder = mCameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
  mPreviewRequestBuilder!!.addTarget(mImageReader!!.surface)
  mPreviewRequestBuilder!!.addTarget(surface)
  // Here, we create a CameraCaptureSession for camera preview.
  mCameraDevice!!.createCaptureSession(
    listOf(mImageReader!!.surface, surface),
    object : CameraCaptureSession.StateCallback() {

}