Add http://www. in the text if not Exist

问题

How can I know that some text contain "http://www." I want to show domain in Web View. Domain name is written in TextView but there is no restriction to add prefix. If user didn't enter it I have to add and display URL in webview.

回答1:

You can do like this

String url = textView.getText().toString();
if(!url.startsWith("www.")&& !url.startsWith("http://")){
  url = "www."+url;
}
if(!url.startsWith("http://")){
  url = "http://"+url;
}

You can use this url to display content in WebView

Hope this will solve your problem

回答2:

just modified @silwar answer and add https :

 if(!url.startsWith("www.")&& !url.startsWith("http://") && !url.startsWith("https://")){
        url = "www."+url;
    }
    if(!url.startsWith("http://") && !url.startsWith("https://")){
        url = "http://"+url;
    }

回答3:

The most efficient way of checking that the domain name is well formed and contains (or not) a prefix, is using a regular expression.

Check out Java Pattern to match regex in Android. It is worth it.

回答4:

I would just get the text from the TextView and parse it via startsWith(). If this is false, just add it to the text and use setText() to reasign it.

You might also want to check for other expressions like only "www.". So take a closer look at contains().

回答5:

As Sebastien requested, regex is a good option. You can also get the text from the view, create an URI object

Uri uri = Uri.create(view.getText().toString());

then with uri.somemethod You should be able to get everything about an url you want to know. If the uri fails to create, you generate error messages cause something has gone wrong.

回答6:

Try this

String a = "http://";
webview.loadUrl(a + url.getText().toString());

来源：https://stackoverflow.com/questions/10650428/add-http-www-in-the-text-if-not-exist