我正在Android设备上的TextureView上预览USB相机。 我观察到渲染缓慢。

场景是-有一个物体（例如一个瓶子）将相机聚焦。有五颜六色的灯光（白色，红色，黄色等）。我通过逐个切换灯光来捕获对象的照片。假设我打开任何灯，那么预览大约需要2秒钟才能反映对象上的颜色变化。

下面是代码。

SurfaceTexture texture = textureView.getSurfaceTexture();
assert texture != null;
Surface surface = new Surface(texture);
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
texture.setDefaultBufferSize(viewWidth,viewHeight);
CameraCharacteristics characteristics = manager.getcameraCharacteristics(cameraId);
captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE,CaptureRequest.CONTROL_SCENE_MODE_actION);
captureRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE,CaptureRequest.CONTROL_SCENE_MODE_HDR);
captureRequestBuilder.set(CaptureRequest.EDGE_MODE,CaptureRequest.EDGE_MODE_ZERO_SHUTTER_LAG);
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_OFF);
captureRequestBuilder.addTarget(surface);