java - Parse nested JSON with varying number of entries -

i'm working on bus transit app , 1 of network calls need make gets trip info on how point point b. bus transit api has method provides info. method returns 3 viable itineraries, , each itinerary has variable amount of legs. there 2 types of legs, walking legs , riding legs.

i wondering on how should go parsing data , transferring ui. what's throwing me off nested entries have nested arrays of variable length (that can of either 2 types). first retrieve data think using arraylist of arraylist work. should create 2 models correspond 2 type of legs, add data those, , dynamically add listview i'm going use display results? (i have dynamically add itineraries).

oh , thing. if bus need on finishes route , starts new 1 (while need stay on whole time) return multiple services in single leg , have no idea how efficiently check , convey user.

here's link documentation https://developer.cumtd.com/documentation/v2.2/method/getplannedtripsbystops

here's sample json response bus website gives

{    "time":"2012-01-26t13:22:05-06:00",    "new_changeset": true,    "status":{       "code":200,       "msg":"ok"    },    "rqst":{       "method":"getplannedtripsbystops",       "params":{          "destination_stop_id":"unipspct",          "origin_stop_id":"dncncltn"       }    },    "itineraries":[       {          "start_time":"2012-01-26t13:41:00-06:00",          "end_time":"2012-01-26t14:11:00-06:00",          "travel_time":30,          "legs":[             {                "services":[                   {                      "begin":{                         "lat":40.122199,                         "lon":-88.295524,                         "name":"duncan & clayton (se corner)",                         "stop_id":"dncncltn:2",                         "time":"2012-01-26t13:41:00-06:00"                      },                      "end":{                         "lat":40.131976,                         "lon":-88.288742,                         "name":"parkland college",                         "stop_id":"pkln:1",                         "time":"2012-01-26t13:45:00-06:00"                      },                      "route":{                         "route_color":"725700",                         "route_id":"9a brown",                         "route_long_name":"brown",                         "route_short_name":"9a",                         "route_text_color":"ffffff"                      },                      "trip":{                         "trip_id":"9ba311__bb3",                         "trip_headsign":"counry fair / parkland",                         "route_id":"9a brown",                         "block_id":"bb3",                         "direction":"a",                         "service_id":"bb3",                         "shape_id":"9a"                      }                   },                   {                      "begin":{                         "lat":40.131976,                         "lon":-88.288742,                         "name":"parkland college",                         "stop_id":"pkln:1",                         "time":"2012-01-26t13:58:00-06:00"                      },                      "end":{                         "lat":40.116209,                         "lon":-88.257355,                         "name":"university & prospect (se far side)",                         "stop_id":"unipspct:6",                         "time":"2012-01-26t14:11:00-06:00"                      },                      "route":{                         "route_color":"666666",                         "route_id":"grey",                         "route_long_name":"grey",                         "route_short_name":"7",                         "route_text_color":"ffffff"                      },                      "trip":{                         "trip_id":"3gr763__bb3",                         "trip_headsign":"east - edgewood",                         "route_id":"grey",                         "block_id":"bb3",                         "direction":"east",                         "service_id":"bb3",                         "shape_id":"7e"                      }                   }                ],                "type":"service"             }          ]       }    ] } 

any appreciated i've been thinking lot , haven't made real progress.

this have far (only have code parsing right now).

 final string json_itineraries = "itenararies";             final string json_stop_name = "stop_name";             final string json_stop_lat = "stop_lat";             final string json_stop_long = "stop_long";             final string json_stop_id = "stop_id";               try {                 jsonarray itinerariesarray;                 jsonobject stopsjson = new jsonobject(jsonstr);                 itinerariesarray = stopsjson.getjsonarray(json_itineraries);              arraylist itinerariesarraylist = new arraylist<arraylist<string>>(itinerariesarray.length());              (int = 0; < itinerariesarray.length(); i++) {                   jsonobject singletrip = itinerariesarray.getjsonobject(i);                 jsonarray singletriplegsjson = singletrip.getjsonarray("legs");                 arraylist legsarraylist = new arraylist<string>(singletriplegsjson.length());                  (int j=0; j<singletriplegsjson.length(); j++) {                     jsonobject singletripobjectsingleleg = singletriplegsjson.getjsonobject(j);                     string type = singletripobjectsingleleg.getstring("type")                                         //?????                      } 

i recommand use gson. gson very useful tool json.

first, use http://www.jsonschema2pojo.org/ make class json.

copy & paste json string site,
select "source type : json",
select "annotation style: gson",
press "preview" or "jar" java classes.

second, use gson parse json string. visit here more examples.

example:
private gson gson = new gson();

string sampledata = //         "[" //                 + "{\"info\": {\"place\": \"place1\"},"                 + "\"events\": {\"info\": \"555f1fc297f229004dd6e8aa\",\"time\": \"5\",\"image\": \"555f1fc2d197270b6c732d3b\",\"event_name\": \"555f1fc224d1cb629a8ef603\"}},"                 + "{\"info\": {\"place\": \"place3\"},"                 + "\"events\": {\"info\": \"555f1fc283c7b150ede89c05\",\"time\": \"7\",\"image\": \"555f1fc2bf5fa8a3b320e0ca\",\"event_name\": \"555f1fc20d40f1b478610505\"}},"                 + "{\"info\": {\"place\": \"place2\"},"                 + "\"events\": {\"info\": \"555f1fc29163e85ae42e7518\",\"time\": \"6\",\"image\": \"555f1fc21506a186c2d34a92\",\"event_name\": \"555f1fc272a06e68b8c3f4b7\"}}" + "  ]";      java.lang.reflect.type listtype = new typetoken<list<event>>() {     }.gettype();     arraylist<event> eventlist = gson.fromjson(sampledata, listtype);