CODEWITHSUNDEEP
javaandroid
Parham
Parham

Reputation: 116

Check link to know if it is image or not in android/java

I'm developing some kind of android mail app and I get each mail attachments as an ArrayList of urls from a rest api and I want to use them in some kind of attachment section. I need to check the urls and pass image links to a preview adapter using glide api and show other urls (other file formats, like .pdf, .docx or ...) in another section as a download link.

Is there any way to know if the url is link to a image file or not before downloading it?

I know there are seemingly similar threads that are answered already but this is different in two ways. First I want to to know if the url is link to image or not before downloading it. Second I don't want to use static extension check. Because there are like tons of different extensions like .jpg, .png,... and they may change and I don't want to update my app with each change.

Upvotes: 2

Views: 2193

Answers (4)

Coder123
Coder123

Reputation: 854

If you have the URI you could: use this for the full path and substring after the last "."

Upvotes: 0

P.Rostami
P.Rostami

Reputation: 11

You can checkout response content-type. Checkout this answer:

https://stackoverflow.com/a/5802223

Upvotes: 1

Ahmad Sabeh
Ahmad Sabeh

Reputation: 556

There is a way you can do it but I'm not sure its the best approach.

Code: 

new Thread(new Runnable() { // if already doing the checking on network thread then no need to add this thread
        @Override
        public void run() {
            try {
                URLConnection connection = new URL("image url here").openConnection();
                String contentType = connection.getHeaderField("Content-Type");
                boolean image = contentType.startsWith("image/"); //true if image 
                Log.i("IS IMAGE", "" + image);

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }).start();

Hope this helps!

Upvotes: 3

马树忠
马树忠

Reputation: 21

You can provide additional fields,which can help you identify file format, in your rest API.

Upvotes: 1

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