How to check if URL is valid in Android

Question

Is there a good way to avoid the \"host is not resolved\" error that crashes an app? Some sort of a way to try connecting to a host ( like a URL ) and see if it\'s even vali

Answer 1

In my case Patterns.WEB_URL.matcher(url).matches() does not work correctly in the case when I type String similar to "first.secondword"(My app checks user input). This method returns true.

URLUtil.isValidUrl(url) works correctly for me. Maybe it would be useful to someone else

Answer 2

new java.net.URL(String) throws MalformedURLException

Answer 3

URLUtil.isValidUrl(url);

If this doesn't work you can use:

Patterns.WEB_URL.matcher(url).matches();

Answer 4

public static boolean isURL(String text) {
    String tempString = text;

    if (!text.startsWith("http")) {
        tempString = "https://" + tempString;
    }

    try {
        new URL(tempString).toURI();
        return Patterns.WEB_URL.matcher(tempString).matches();
    } catch (MalformedURLException | URISyntaxException e) {
        e.printStackTrace();
        return false;
    }
}

This is the correct sollution that I'm using. Adding https:// before original text prevents text like "www.cats.com" to be considered as URL. If new URL() succeed, then if you just check the pattern to exclude simple texts like "https://cats" to be considered URL.

Answer 5

I have tried a lot of methods.And find that no one works fine with this URL:

Now I use the following and everything goes well.

public static boolean checkURL(CharSequence input) {
    if (TextUtils.isEmpty(input)) {
        return false;
    }
    Pattern URL_PATTERN = Patterns.WEB_URL;
    boolean isURL = URL_PATTERN.matcher(input).matches();
    if (!isURL) {
        String urlString = input + "";
        if (URLUtil.isNetworkUrl(urlString)) {
            try {
                new URL(urlString);
                isURL = true;
            } catch (Exception e) {
            }
        }
    }
    return isURL;
}

Answer 6

If you are using from kotlin you can create a String.kt and write code bellow:

fun String.isValidUrl(): Boolean = Patterns.WEB_URL.matcher(this).matches()

Then:

String url = "www.yourUrl.com"
if (!url.isValidUrl()) {
    //some code
}else{
   //some code
}