Android how to parse URL String with spaces to URI object

Question

I have a string representing an URL containing spaces and want to convert it to an URI object  If I simply try to create it via  String myString    http   myhost com media File Name that has spaces inside mp3   URI myUri   new URI myString     it gives me   java net URISyntaxException  Illegal character in path at index X   where index X is the position of the first space in the URL string   How can i parse myString into a URI object

User · Answer

To handle spaces     and other unsafe characters in arbitrary locations in the url path  Use Uri Builder in combination with a local instance of URL as I have described here   private Uri Builder builder  public Uri getUriFromUrl String thisUrl        URL url   new URL thisUrl       builder    new Uri Builder                                scheme url getProtocol                                 authority url getAuthority                                 appendPath url getPath         return builder build

User · Answer

URL url   Test class getResource args 0        reading demo file path from                                                                                                   same location where class                                     File input null  try       input   new File url toURI       catch  URISyntaxException e1           TODO Auto-generated catch block     e1 printStackTrace

User · Answer

You should in fact URI-encode the  invalid  characters  Since the string actually contains the complete URL  it s hard to properly URI-encode it  You don t know which slashes   should be taken into account and which not  You cannot predict that on a raw String beforehand  The problem really needs to be solved at a higher level  Where does that String come from  Is it hardcoded  Then just change it yourself accordingly  Does it come in as user input  Validate it and show error  let the user solve itself   At any way  if you can ensure that it are only the spaces in URLs which makes it invalid  then you can also just do a string-by-string replace with  20   URI uri   new URI string replace        20       Or if you can ensure that it s only the part after the last slash which needs to be URI-encoded  then you can also just do so with help of android net Uri utility class   int pos   string lastIndexOf        1  URI uri   new URI string substring 0  pos    Uri encode string substring pos       Do note that URLEncoder is insuitable for the task as it s designed to encode query string parameter names values as per application x-www-form-urlencoded rules  as used in HTML forms   See also Java URL encoding of query string parameters

User · Answer

java net URLEncoder encode finalPartOfString   utf-8      This will URL-encode the string   finalPartOfString is the part after the last slash - in your case  the name of the song  as it seems

User · Answer

I wrote this function   public static String encode  NonNull String uriString        if  TextUtils isEmpty uriString             Assert fail  Uri string cannot be empty             return uriString               getQueryParameterNames is not exist then cannot iterate on queries     if  Build VERSION SDK INT  lt  11            return uriString                Check if uri has valid characters        See https   tools ietf org html rfc3986     Pattern allowedUrlCharacters   Pattern compile    A-Za-z0-9                   amp                          -    0-9a-fA-F  2           Matcher matcher   allowedUrlCharacters matcher uriString       String validUri   null      if  matcher find              validUri   matcher group              if  TextUtils isEmpty validUri     uriString length      validUri length              return uriString                The uriString is not encoded  Then recreate the uri and encode it this time     Uri uri   Uri parse uriString       Uri Builder uriBuilder   new Uri Builder                scheme uri getScheme                 authority uri getAuthority         for  String path   uri getPathSegments              uriBuilder appendPath path             for  String key   uri getQueryParameterNames              uriBuilder appendQueryParameter key  uri getQueryParameter key              String correctUrl   uriBuilder build   toString        return correctUrl

[java] Android: how to parse URL String with spaces to URI object?

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