android: get image dimensions without opening it

Question

I want to get width and height (in pixels) of images which are stored on the sdcard, before loading them into RAM. I need to know the size, so I can downsample them accordingly when loading them. Without downsampling them I get an OutOfMemoryException.

Anyone knows how to get dimensions of image files?

score 127 · Accepted Answer · edited Nov 19 '19 at 14:53

127

Pass the option to just decode the bounds to the factory:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;

//Returns null, sizes are in the options variable
BitmapFactory.decodeFile("/sdcard/image.png", options);
int width = options.outWidth;
int height = options.outHeight;
//If you want, the MIME type will also be decoded (if possible)
String type = options.outMimeType;

edited Nov 19 '19 at 14:53

answered Jun 20 '12 at 21:30

devunwired

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How can get the Density value? – Bob Nov 24 '14 at 10:23
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returns 0 for height and width – AlwaysConfused May 17 '17 at 01:22
If the uri is something like `"images/1234/get"` which is not include image format, is it possible to get the dimensions? @Devunwired – inverted_index Jul 25 '17 at 07:41
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this still processes images, while checking multiple images it takes too long, decodeFile still processes the whole image even if it doesn't allocate memory for it. – M D P May 29 '18 at 23:19

score 2 · Answer 2 · edited Oct 05 '15 at 03:09

2

Actually, there is another way to solve this problem. Using the below way, we can avoid the trouble with file and URI.

BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
ParcelFileDescriptor fd = mContext.getContentResolver().openFileDescriptor(u, "r"); // u is your Uri
BitmapFactory.decodeFileDescriptor(fd.getFileDescriptor(), null, options);

edited Oct 05 '15 at 03:09

spenibus

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answered Oct 05 '15 at 02:43

Tinh Duong

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See also http://stackoverflow.com/questions/23867823/get-image-width-and-height-from-uri?lq=1. – CoolMind Dec 14 '15 at 14:25

android: get image dimensions without opening it

2 Answers2

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