Question

我已经使用camera2 API对摄像机进行了编程，但是当我执行onCaptureCompleted或onCaptureProgressed方法时，除了LENS_FOCAl_LENGTH之外的值都为空。

@Override
    public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
        super.onCaptureCompleted(session, request, result);

        String aperture = String.valueOf(result.get(CaptureResult.LENS_APERTURE));
        String focal_length = String.valueOf(result.get(CaptureResult.LENS_FOCAL_LENGTH));
        String focus_distance = String.valueOf(result.get(CaptureResult.LENS_FOCUS_DISTANCE));
        String exposure_time = String.valueOf(result.get(CaptureResult.SENSOR_EXPOSURE_TIME));
        String frame_duration = String.valueOf(result.get(CaptureResult.SENSOR_EXPOSURE_TIME));
        String sensitivity = String.valueOf(result.get(CaptureResult.SENSOR_SENSITIVITY));

    }

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Answer 1

您需要在其他设备上进行测试。根据文档（https://developer.android.com/reference/android/hardware/camera2/CaptureResult），几乎所有值“可选-此键的值在某些设备上可能为null。”

例如，在您的情况下不为null的LENS_FOCAL_LENGTH是“此密钥在所有设备上都可用”。因此，所有值都取决于设备类型。

相机模拟光传感器

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