如何在camera2应用程序接口中触发自动对焦，同时保持当前的ISO和速度？

// Step 1: 获取相机设备和创建相机会话
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String cameraId = cameraManager.getCameraIdList()[0]; // 获取第一个相机设备
cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
    @Override
    public void onOpened(CameraDevice camera) {
        // 相机设备打开成功，可以创建相机会话
        List<Surface> outputSurfaces = new ArrayList<>();
        outputSurfaces.add(previewSurface); // 预览Surface
        camera.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(CameraCaptureSession session) {
                // 相机会话创建成功，可以进行后续操作
                // Step 2: 配置相机请求
                try {
                    CaptureRequest.Builder requestBuilder = session.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
                    requestBuilder.addTarget(previewSurface);
                    requestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);

                    // Step 3: 设置ISO和速度
                    requestBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, isoValue);
                    requestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
                    requestBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, exposureTime);

                    // Step 4: 发送相机请求和监听结果
                    session.capture(requestBuilder.build(), new CameraCaptureSession.CaptureCallback() {
                        @Override
                        public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
                            // 对焦完成后的处理
                            // ...
                        }
                    }, null);
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
    
            // 其他回调方法省略...
        }, null);
    }
    
    // 其他回调方法省略...
}, null);