Converting JSONarray to ArrayList

Question

I am downloading a JSON string and converting it to JSONArray   Im putting it into a listview and need to be able to delete from that listview later  and since JSONArray has no  remove method  Thanks Obama   I am trying to convert it to an arraylist   here is my JSON  the array toString         thumb url   tb-1370913834 jpg   event id   15   count   44   event tagline   this is a tagline   event name   5th birthday   event end   1370919600   event start   1370876400      I need to get it into an array and be able to call the strings by their respective keys   Appreciate any help

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JSONArray array   new JSONArray json    List lt JSONObject gt  list   new ArrayList     for  int i   0  i  lt  array length   list add array getJSONObject i

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Generic variant  public static  lt T gt  List lt T gt  getList JSONArray jsonArray  throws Exception        List lt T gt  list   new ArrayList lt  gt  jsonArray length          for  int i   0  i  lt  jsonArray length    i               list add  T jsonArray get i               return list        Usage  List lt String gt  listKeyString   getList dataJsonObject getJSONArray  keyString

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try this way Simply loop through that  building your own array  This code assumes it s an array of strings  it shouldn t be hard to modify to suit your particular array structure   JSONArray jsonArray   new JSONArray jsonArrayString   List lt String gt  list   new ArrayList lt String gt     for  int i 0  i lt jsonArray length    i          list add  jsonArray getString i

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A simpler Java 8 alternative  JSONArray data   new JSONArray      create data from this - gt     quot thumb url quot   quot tb-1370913834 jpg quot   quot event id quot         List lt JSONObject gt  list   data stream   map o - gt   JSONObject  o  collect Collectors toList

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Just going by the original subject of the thread   converting jsonarray to list  used jackson jsonarray and object mapper here    ObjectMapper mapper   new ObjectMapper    JSONArray array   new JSONArray    array put  IND    array put  CHN    List lt String gt  list   mapper readValue array toString    List class

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ArrayList lt String gt  listdata   new ArrayList lt String gt          JSONArray jArray    JSONArray jsonObject   if  jArray    null        for  int i 0 i lt jArray length   i          listdata add jArray getString i

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I have fast solution  Just create a file ArrayUtil java  import java util ArrayList  import java util Collection  import org json JSONArray  import org json JSONException   public class ArrayUtil       public static ArrayList lt Object gt  convert JSONArray jArr                ArrayList lt Object gt  list   new ArrayList lt Object gt             try               for  int i 0  l jArr length    i lt l  i                      list add jArr get i                            catch  JSONException e              return list             public static JSONArray convert Collection lt Object gt  list                return new JSONArray list              Usage   ArrayList lt Object gt  list   ArrayUtil convert jArray     or  JSONArray jArr   ArrayUtil convert list

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Java 8 style    JSONArray data   jsonObject getJSONArray  quot some-node quot        List lt JSONObject gt  list   StreamSupport stream data spliterator    false                   map e - gt   JSONObject e                   collect Collectors toList

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Instead of converting the JSON string to an ArrayList or even a Map  you can just create a JSONObject itself   This object has the ability to get string values by key  as you want and also to remove objects   To create a JSONObject from a properly formatted JSON string  you simply call the  appropriate constructor   JSONObject json   new JSONObject jsonString

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I ve done it using Gson  by Google    Add the following line to your module s build gradle   dependencies                 Note that  compile  will be deprecated  Use  implementation  instead       See https   stackoverflow com a 44409111 for more info   implementation  com google code gson gson 2 8 2      JSON string   private String jsonString      n                           n                                   id      c200    n                                   name      Ravi Tamada    n                                   email      ravi gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c201    n                                   name      Johnny Depp    n                                   email      johnny depp gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c202    n                                   name      Leonardo Dicaprio    n                                   email      leonardo dicaprio gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c203    n                                   name      John Wayne    n                                   email      john wayne gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c204    n                                   name      Angelina Jolie    n                                   email      angelina jolie gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       female    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c205    n                                   name      Dido    n                                   email      dido gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       female    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c206    n                                   name      Adele    n                                   email      adele gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       female    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c207    n                                   name      Hugh Jackman    n                                   email      hugh jackman gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c208    n                                   name      Will Smith    n                                   email      will smith gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c209    n                                   name      Clint Eastwood    n                                   email      clint eastwood gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c2010    n                                   name      Barack Obama    n                                   email      barack obama gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c2011    n                                   name      Kate Winslet    n                                   email      kate winslet gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       female    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                            n                           n                                   id      c2012    n                                   name      Eminem    n                                   email      eminem gmail com    n                                   address      xx-xx-xxxx x - street  x - country    n                                   gender       male    n                                   phone      n                                       mobile       91 0000000000    n                                       home      00 000000    n                                       office      00 000000   n                                   n                           n                           ContactModel java    public class ContactModel        public String id       public String name       public String email      Code for converting a JSON string to ArrayList lt Model gt    Note  You have to import java lang reflect Type       Top of file import java lang reflect Type           private void parseJSON         Gson gson   new Gson        Type type   new TypeToken lt List lt ContactModel gt  gt      getType        List lt ContactModel gt  contactList   gson fromJson jsonString  type       for  ContactModel contact   contactList           Log i  Contact Details   contact id    -    contact name    -    contact email             Hope this will help you

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With Kotlin  you can avoid a loop by wrapping the JSONArray with a MutableList  e g  val artistMetadata   player metadata optJSONArray  quot artist quot   val artists   MutableList lt String gt  artistMetadata length      i - gt  artistMetadata getString i

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if you want to extract data form JSON string array  here is my working code  change parameter as your data     PoJo class  public class AllAppModel       private String appName      private String packageName      private int uid      private boolean isSelected      private boolean isSystemApp      private boolean isFav      Extract your data using below line of code  try       JSONArray jsonArr   new JSONArray  Your json string array        List lt AllAppModel gt  lstExtrextData   new ArrayList lt  gt         for  int i   0  i  lt  jsonArr length    i              JSONObject jsonObj   jsonArr getJSONObject i           AllAppModel data   new AllAppModel            data setAppName jsonObj getString  appName             data setPackageName jsonObj getString  packageName             data setUid jsonObj getInt  uid             data setSelected jsonObj getBoolean  isSelected             data setSystemApp jsonObj getBoolean  isSystemApp             data setFav jsonObj getBoolean  isFav             lstExtrextData add data           catch  JSONException e        e printStackTrace        it will return you List of PoJo class object

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Using Gson      List lt Student gt  students   new ArrayList lt  gt         JSONArray jsonArray   new JSONArray stringJsonContainArray       for  int i   0  i  lt  jsonArray length    i              Student student   new Gson   fromJson jsonArray get i  toString    Student class           students add student             return students

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To make it handy  use POJO   try like this    List lt YourPojoObject gt  yourPojos   new ArrayList lt YourPojoObject gt      JSONObject jsonObject   new JSONObject jsonString   YourPojoObject yourPojo   new YourPojoObject    yourPojo setId jsonObject getString  idName              yourPojos add yourPojo

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public static List lt JSONObject gt  getJSONObjectListFromJSONArray JSONArray array           throws JSONException     ArrayList lt JSONObject gt  jsonObjects   new ArrayList lt  gt       for  int i   0              i  lt   array    null   array length     0                         jsonObjects add array getJSONObject i                 return jsonObjects

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ArrayList lt String gt  listdata   new ArrayList lt String gt          JSONArray jArray    JSONArray jsonObject   if  jArray    null      listdata addAll jArray        simplified

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In Java 8   IntStream range 0 jsonArray length    mapToObj i- gt jsonArray getString i   collect Collectors toList

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I have fast solution  Just create a file ArrayUtil java  ObjectMapper mapper   new ObjectMapper     List lt Student gt  list   Arrays asList mapper readValue jsonString  Student   class        Usage   ArrayList lt Object gt  list   ArrayUtil convert jArray     or  JSONArray jArr   ArrayUtil convert list

[android] Converting JSONarray to ArrayList

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