可能是由于相机设置不正确或代码问题导致自动闪光灯无法正常工作。以下是设置相机并启用自动闪光灯的示例代码：

//创建一个CameraManager对象 CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

//获取可用相机列表 String[] cameraIdList = cameraManager.getCameraIdList();

//选择要使用的相机(这里选择后置相机) String cameraId = cameraIdList[0];

//通过CameraManager打开相机 cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() { @Override public void onOpened(@NonNull CameraDevice camera) { //创建一个CaptureRequest.Builder对象，并设置闪光灯自动模式 try { CaptureRequest.Builder captureRequestBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); captureRequestBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_SINGLE); captureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);

        //启动相机预览
        camera.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(@NonNull CameraCaptureSession session) {
                //创建一个CaptureRequest对象，并发送预览请求
                try {
                    CaptureRequest captureRequest = captureRequestBuilder.build();
                    session.setRepeatingRequest(captureRequest, new CameraCaptureSession.CaptureCallback() {
                        @Override
                        public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
                            //预览请求已完成
                        }
                    }, null);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                //相机会话配置失败
            }
        }, null);
    } catch (CameraAccessException e) {
        e.printStackTrace