Use URI builder in Android or create URL with variables

Question

I m developing an Android app  I need to build a URI for my app to make an API request  Unless there s another way to put a variable in a URI  this is the easiest way I ve found  I found that you need to use Uri Builder  but I m not quite sure how to  My url is   http   lapi transitchicago com api 1 0 ttarrivals aspx key  redacted  amp mapid value    My scheme is http  authority is lapi transitchicago com  path is  api 1 0  path segment s  is ttarrivals aspx  and query string is key  redacted  amp mapid value    My code is below   Intent intent   getIntent    String value   intent getExtras   getString  value    Uri Builder builder   new Uri Builder    builder scheme  http        authority  www lapi transitchicago com        appendPath  api        appendPath  1 0        appendPath  ttarrivals aspx        appendQueryParameter  key     redacted         appendQueryParameter  mapid   value     I understand that I can do URI add  but how do I integrate it into the Uri Builder  Should I add everything like URI add scheme   URI add authority  and so on  Or is that not the way to do it  Also  is there any other easier way to add a variable to a URI URL

User · Answer

You can do that with lambda expressions        private static final String BASE URL    http   api example org data 2 5 forecast daily        private String getBaseUrl Map lt String  String gt  params            final Uri Builder builder   Uri parse BASE URL  buildUpon            params entrySet   forEach entry - gt  builder appendQueryParameter entry getKey    entry getValue              return builder build   toString            and you can create params like that       Map lt String  String gt  params   new HashMap lt String  String gt         params put  zip    94043 us        params put  units    metric      Btw  If you will face any issue like    lambda expressions not supported at this language level     please check this URL   https   stackoverflow com a 22704620 2057154

User · Answer

There is another way of using Uri and we can achieve the same goal  http   api example org data 2 5 forecast daily q 94043 amp mode json amp units metric amp cnt 7   To build the Uri you can use this   final String FORECAST BASE URL         http   api example org data 2 5 forecast daily    final String QUERY PARAM    q   final String FORMAT PARAM    mode   final String UNITS PARAM    units   final String DAYS PARAM    cnt     You can declare all this the above way or even inside the Uri parse   and appendQueryParameter    Uri builtUri   Uri parse FORECAST BASE URL       buildUpon        appendQueryParameter QUERY PARAM  params 0        appendQueryParameter FORMAT PARAM   json        appendQueryParameter UNITS PARAM   metric        appendQueryParameter DAYS PARAM  Integer toString 7        build      At last  URL url   new URL builtUri toString        Source  Udacity Android course   Sunshine app

User · Answer

Let s say that I want to create the following URL   https   www myawesomesite com turtles types type 1 amp sort relevance section-name   To build this with the Uri Builder I would do the following   Uri Builder builder   new Uri Builder    builder scheme  https        authority  www myawesomesite com        appendPath  turtles        appendPath  types        appendQueryParameter  type    1        appendQueryParameter  sort    relevance        fragment  section-name    String myUrl   builder build   toString

User · Answer

Best answer  https   stackoverflow com a 19168199 413127  Example for    http   api example org data 2 5 forecast daily q 94043 amp mode json amp units metric amp cnt 7   Now with Kotlin   val myUrl   Uri Builder   apply           scheme  https           authority  www myawesomesite com           appendPath  turtles           appendPath  types           appendQueryParameter  type    1           appendQueryParameter  sort    relevance           fragment  section-name           build                     toString

User · Answer

Using appendEncodePath   could save you multiple lines than appendPath    the following code snippet builds up this url  http   api openweathermap org data 2 5 forecast daily zip 94043  Uri Builder urlBuilder   new Uri Builder    urlBuilder scheme  http    urlBuilder authority  api openweathermap org    urlBuilder appendEncodedPath  data 2 5 forecast daily    urlBuilder appendQueryParameter  zip    94043 us    URL url   new URL urlBuilder build   toString

User · Answer

for the example in the second Answer I used this technique for the same URL  http   api example org data 2 5 forecast daily q 94043 amp mode json amp units metric amp cnt 7  Uri Builder builder   new Uri Builder                builder scheme  https                        authority  api openweathermap org                        appendPath  data                        appendPath  2 5                        appendPath  forecast                        appendPath  daily                        appendQueryParameter  q   params 0                        appendQueryParameter  mode    json                        appendQueryParameter  units    metric                        appendQueryParameter  cnt    7                        appendQueryParameter  APPID   BuildConfig OPEN WEATHER MAP API KEY     then after finish building it get it as URL like this  URL url   new URL builder build   toString       and open a connection    HttpURLConnection urlConnection    HttpURLConnection  url openConnection      and if link is simple like location uri  for example   geo 0 0 q 29203  Uri geoLocation   Uri parse  geo 0 0    buildUpon                appendQueryParameter  q  29203  build

User · Answer

here is a good way to explain it   there are two forms of the URI  1 - Builder ready to be modified  not ready to be used   2 - Built not ready to be modified  ready to be used    You can create a builder by   Uri Builder builder   new Uri Builder      this gonna return a Builder ready to be modified like this -  builder scheme  https    builder authority  api github com    builder appendPath  search    builder appendPath  repositories    builder appendQueryParameter PARAMETER QUERY parameterValue     but to use it you have to build it first  retrun builder build      or however you gonna use it  and then you have built that is already built for you  ready to use but cannot be modified   Uri built   Uri parse  your URI goes here      this is ready to use but if you want to modify it you need to buildUpon    Uri built   Uri parse  Your URI goes here               buildUpon      now it s ready to be modified             buildUpon               appendQueryParameter QUERY PARAMATER  parameterValue                any modification you want to make goes here             build       you have to build it back cause you are storing it                          as Uri not Uri builder   now every time you want to modify it you need to buildUpon   and in the end build     so Uri Builder is a Builder type that store a Builder in it  Uri is a Built type that store an already built URI in it   new Uri Builder    rerurns a Builder  Uri parse  your URI goes here   returns a Built   and with build   you can change it from Builder to Built  buildUpon   you can change it from Built to Builder  Here is what you can do  Uri Builder builder   Uri parse  URL   buildUpon       here you created a builder  made an already built URI with Uri parse    and then change it to builder with buildUpon    Uri built   builder build      when you want to change your URI  change Builder    when you want to use your URI  use Built   and also the opposite -   Uri built   new Uri Builder   build       here you created a reference to a built URI    made a builder with new Uri Builder   and then change it to a built with     built    Uri Builder builder   built buildUpon      hope my answer helped     lt 3

User · Answer

Excellent answer from above turned into a simple utility method   private Uri buildURI String url  Map lt String  String gt  params            build url with parameters      Uri Builder builder   Uri parse url  buildUpon        for  Map Entry lt String  String gt  entry   params entrySet              builder appendQueryParameter entry getKey    entry getValue                return builder build

[android] Use URI builder in Android or create URL with variables

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