How to create a JSONArray with GSON

Question

Hi in my project i need to create a JSONArray type with the GSON class

    {
  \"message\": [
    \"msg 1\",
    \"msg 2\",
    \"msg 3\"
  ],
  \"asec\": [         


        

Answer 1

Try below code to create JsonObject you desired.

String[] msgArray = new String[]{"msg 1", "msg 2", "msg 3"};
String[] asecArray = new String[]{"asec 1", "asec 2", "asec 3"};

Gson gson = new Gson();
JsonObject obj = new JsonObject(); //Json Object

obj.add("message", gson.toJsonTree(msgArray));
obj.add("asec", gson.toJsonTree(asecArray));

String jsonString = gson.toJson(obj);  //Json String 

Refer Gson documentation for more details

Answer 2

the class:

public class JsonStructure{
    public String[] message;
    public String[] asec;
}

using it:

JsonStructure json = new JsonStructure();
json.message = new String[]{"msg 1", "msg 2", "msg 3"};
json.asec = new String[]{"asec 1", "asec 2", "asec 3"};
Gson gson = new Gson();
String output = gson.toJson(json);
//convert from string
JsonStructure fromString = gson.fromJson(output, JsonStructure.class);

For more details on Google's gson please take a look at https://sites.google.com/site/gson/gson-user-guide

Answer 3

public class ArrayBean {
    ArrayList<String> message = new ArrayList<String>();
    ArrayList<String> asec = new ArrayList<String>();

}

create bean class above arraybean, then u can add the values on your main class and print the output.

   Gson gson = new Gson();
   ArrayBean arrayBean = new ArrayBean();

        arrayBean.message.add("msg 1");
        arrayBean.message.add("msg 2");
        arrayBean.message.add("msg 3");

        arrayBean.asec.add("asec 1");
        arrayBean.asec.add("asec 2");
        arrayBean.asec.add("asec 3");


        Log.d("rvg",""+gson.toJson(arrayBean));