Android: How to get width and height of an image without using JavaX's ImageIO?

Question

Given an image stored in a File object, how would I get the width and height of that image without using the javax.imageio module, since Android does not allow you to use that module?

CommonsWare · Accepted Answer · 2021-06-10 22:43:51Z

2

Use something like this:

BitmapFactory.Options bmpOptions = new BitmapFactory.Options(); bmpOptions.inJustDecodeBounds = true; BitmapFactory.decodeFile(yourFile, bmpOptions);

bmpOptions will have outWidth and outHeight with your image dimensions.

answered Jun 10, 2021 at 22:43

CommonsWare

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4 Comments

Adam Lee Over a year ago

Is yourFile the file path of the image?

CommonsWare Over a year ago

@AdamLee: Yes. Annoyingly, decodeFile() takes a String, not a File.

Adam Lee Over a year ago

Is there any way to get the width and height from a URI instead? It is extremely difficult for me to get the image's absolute file path since Android does not seem to allow you to get the absolute file path from a URI.

CommonsWare Over a year ago

@AdamLee: "Is there any way to get the width and height from a URI instead?" -- if by "URI" you mean Uri that you get back from something like ACTION_OPEN_DOCUMENT, use BitmapFactory.decodeStream(). You can get an InputStream on the content by passing the Uri to openInputStream() on a ContentResolver. "Android does not seem to allow you to get the absolute file path from a URI" -- that is because a Uri does not necessarily point to a file on the filesystem that your app has rights to access.

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