Android图像捕获和缩放

Question

I am using the Camera activity to capture the JPEG image. After image is saved and the controll is returned back to my application activity I would like to to determine the captured JPEG image dimensions without loading the whole image into memory via Bitmap object - can it be easily done somehow?

Is there any class, which reads the JPEG header and give me such information? I would like to avoid OOM conditions - but might be it is not a problem to load the whole image into memory - is it?

After knowing the dimensions I would like to use BitmapFactory to scale the image.

Thanks a lot

Kind Regards,

STeN

Answer 1

Perhaps a work-around (see 2nd approach) by setting the quality?

bmp.compress(CompressFormat.JPEG, 75, pfos);

You would have to do a trial run to see what size the quality gets you though...

*The first approach creates a log file to get the width and height but not sure if you wanted the extra step of looking at a log file.

Answer 2

您可以使用ExifInterface类来读取图像的宽度和高度。