URL encoding in Android

Question

How do you encode a URL in Android   I thought it was like this   final String encodedURL   URLEncoder encode urlAsString   UTF-8    URL url   new URL encodedURL     If I do the above  the http    in urlAsString is replaced by http 3A 2F 2F in encodedURL and then I get a  java net MalformedURLException when I use the URL

User · Answer

For android  I would use  String android net Uri encode String s      Encodes characters in the given string as    -escaped octets using the UTF-8 scheme  Leaves letters   A-Z    a-z    numbers   0-9    and unreserved characters    -          intact  Encodes all other characters    Ex   String urlEncoded    http   stackoverflow com search q     Uri encode query

User · Answer

You don t encode the entire URL  only parts of it that come from  quot unreliable sources quot    Java  String query   URLEncoder encode  quot apples oranges quot    quot utf-8 quot    String url    quot http   stackoverflow com search q  quot    query    Kotlin  val query  String   URLEncoder encode  quot apples oranges quot    quot utf-8 quot   val url    quot http   stackoverflow com search q  query quot     Alternatively  you can use Strings urlEncode String str  of DroidParts that doesn t throw checked exceptions  Or use something like String uri   Uri parse  quot http       quot                    buildUpon                    appendQueryParameter  quot key quot    quot val quot                    build   toString

User · Answer

try                       query   URLEncoder encode query   utf-8                      catch  UnsupportedEncodingException e                           TODO Auto-generated catch block                     e printStackTrace

User · Answer

Find Arabic chars and replace them with its UTF-8 encoding  some thing like this   for  int i   0  i  lt  urlAsString length    i          if  urlAsString charAt i   gt  255            urlAsString   urlAsString substring 0  i    URLEncoder encode urlAsString charAt i       UTF-8     urlAsString substring i 1           encodedURL   urlAsString

User · Answer

you can use below methods  public static String parseUrl String surl  throws Exception       URL u   new URL surl       return new URI u getProtocol    u getAuthority    u getPath    u getQuery    u getRef    toString        or  public String parseURL String url  Map lt String  String gt  params        Builder builder   Uri parse url  buildUpon        for  String key   params keySet                  builder appendQueryParameter key  params get key              return builder build   toString        the second one is better than first

User · Answer

Also you can use this  private static final String ALLOWED URI CHARS       amp    -               String urlEncoded   Uri encode path  ALLOWED URI CHARS     it s the most simple method

User · Answer

I m going to add one suggestion here   You can do this which avoids having to get any external libraries     Give this a try   String urlStr    http   abc dev domain com 0007AC ads 800x480 15sec h 264 mp4   URL url   new URL urlStr   URI uri   new URI url getProtocol    url getUserInfo    url getHost    url getPort    url getPath    url getQuery    url getRef     url   uri toURL      You can see that in this particular URL  I need to have those spaces encoded so that I can use it for a request     This takes advantage of a couple features available to you in Android classes   First  the URL class can break a url into its proper components so there is no need for you to do any string search replace work   Secondly  this approach takes advantage of the URI class feature of properly escaping components when you construct a URI via components rather than from a single string   The beauty of this approach is that you can take any valid url string and have it work without needing any special knowledge of it yourself

[android] URL encoding in Android

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