Android相机在哪里确定即时预览帧？
我试图确保在相机中拍照后短暂显示的预览帧与捕获的图像密切对应。预览图像和捕获的图像之间存在一点延迟，当捕获运动中的主体时，这是一个问题。
在相机代码中是这些注释:
// If postview callback has arrived, the captured image is displayed
// in postview callback. If not, the captured image is displayed in
// raw picture callback.
但我没看到。我看到在 capture() 结束时，mPreviewing 设置为 false，并且 JpegPictureCallback 稍后恢复预览。这对我来说意味着冻结的图像是从 mPreviewing 关闭那一刻起的图像 - 我没有看到任何代码可以用任何更新的图像替换该图像。评论正确吗？如果是这样，图像在哪里更新？
I am trying to ensure that the preview frame which is displayed briefly after snapping a picture in Camera corresponds closely to the captured image. There is a bit of delay between the preview image and the captured image, and when capturing subjects in motion, that's a problem.
In the Camera code are these comments:
// If postview callback has arrived, the captured image is displayed
// in postview callback. If not, the captured image is displayed in
// raw picture callback.
But I don't see it. I see that at the end of capture(), mPreviewing is set to false, and the JpegPictureCallback resumes previewing after a little bit. This suggests to me that the frozen image is the one from the moment mPreviewing is switched off - I don't see any code that would replace that image with anything fresher. Are the comments correct? If so, where is the image updated?
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