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?

Answer 1

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; 

Answer 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);