Camera2basic 应用程序，在 Android 6.0 LGG3 中具有非常暗的预览

新的 API，也许只在 LG G3 上，似乎发生了一些变化。

我在用着示例代码 https://github.com/googlesamples/android-Camera2Basic.

在我的 Nexus 4 上，代码运行完美，但在更新到 Android 6.0 的 LGG3 上则不然。有任何想法吗？

我尝试了这些设置，但运气不佳，这在 Nexus 4 上仍然运行良好：

mPreviewRequestBuilder.set(CaptureRequest.BLACK_LEVEL_LOCK, false);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_LOCK, false);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_MODE, CaptureRequest.CONTROL_AWB_MODE_AUTO);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_LOCK, false);

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_ANTIBANDING_MODE, CaptureRequest.CONTROL_AE_ANTIBANDING_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 0);
//mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, Range.create(1000,1000));
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER, 0);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.COLOR_CORRECTION_MODE, CaptureRequest.CONTROL_MODE_AUTO);


mPreviewRequestBuilder.set(CaptureRequest.CONTROL_CAPTURE_INTENT,
        CaptureRequest.CONTROL_CAPTURE_INTENT_PREVIEW);

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
        CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

我找到了适合我的解决方案。解决方法是设置设备支持的FPS范围。

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, getRange());

获取范围的函数：

private Range<Integer> getRange() {
    CameraCharacteristics chars = mCameraManager.getCameraCharacteristics(mCameraId);
    Range<Integer>[] ranges = chars.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);

    Range<Integer> result = null;

    for (Range<Integer> range : ranges) {
        int upper = range.getUpper();

        // 10 - min range upper for my needs
        if (upper >= 10) {
            if (result == null || upper < result.getUpper().intValue()) {
                result = range;
            }
        }
    }

    if (result == null) {
        result = ranges[0];
    }

    return result;
}

Update:其他设置（如果有人感兴趣的话）

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_LOCK, false);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AWB_MODE, CameraMetadata.CONTROL_AWB_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
mPreviewRequestBuilder.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, CameraMetadata.STATISTICS_FACE_DETECT_MODE_SIMPLE);