Camera2 capture（）函数将忽略我的SENSOR_EXPOSURE_TIME

Question

我正在尝试使用Camera2 API捕获具有特定曝光时间的图像。 将其设置为较小的值（例如1/8000秒或1/10）时，一切看起来都很好。 问题出在我尝试将其设置为5秒或30之类的值时，即使SENSOR_INFO_EXPOSURE_TIME_RANGE是：

from 13181 to 48369980540(48 seconds).

当我从CaptureResult获取曝光时间时，我得到的是我输入的值，而不是真实的曝光时间。

我知道我的相机可以以更高的曝光度拍摄照片，因为我的相机限制为30秒。

那是我尝试的代码：

final CaptureRequest.Builder captureBuilder =
                mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
        captureBuilder.addTarget(mImageReader.getSurface());

            captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
            captureBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, 100);
            captureBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, 10000000000L);//10 seconds




        // Orientation
        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
        captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));

        CameraCaptureSession.CaptureCallback CaptureCallback
                = new CameraCaptureSession.CaptureCallback() {

            @Override
            public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                           @NonNull CaptureRequest request,
                                           @NonNull TotalCaptureResult result) {
                showToast("Saved: " + mFile);
                Log.d(TAG, mFile.toString());
                Long expo = result.get(CaptureResult.SENSOR_EXPOSURE_TIME);
                unlockFocus();
            }
        };

        mCaptureSession.stopRepeating();
        mCaptureSession.abortCaptures();
        mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);