如何在Android中循环遍历JSON数组？

Question

I have a string comming from php looking exactly like that : "[{"id":"0","noteText":"Noteeeeeeee","date":"1232131","author":"John","authorId":"1"},{"id":"1","noteText":"Noteeeeeeee","date":"1232131","author":"Rob","authorId":"1"}]"

Then in my onCreate in the mainActiviry.java I got to this point :

    String json = allNotes;
    //System.out.println("String to Json Array Stmt");
    JsonParser parser = new JsonParser();
    JsonElement notes = parser.parse(allNotes);
    JsonArray notesArr = notes.getAsJsonArray();

My goal is to parse the json string to array of json objects, then loop over it and feed it to a ListView . The problem is that I cannot get there, since I am failing to loop over this jsonArray . My java knowledge is too limited, so other questions didn't help me much.

Can someone help, please?

ps i am using gson

Answer 1

Traverse the JsonArray using size while fetching the JsonElement using get function using i index and convert it into JsonObject using getAsJsonObject() function

    JsonParser parser  = new JsonParser();
    JsonElement notes  = parser.parse(s);
    JsonArray notesArr = notes.getAsJsonArray();
    for (int i = 0; i < notesArr.size(); i++) {
        // get your jsonobject 
        JsonObject obj = notesArr.get(i).getAsJsonObject();

       // do the same for the rest of the elements like date , author ,authorId
        String id,noteText,author;

        // fetch data from object
        id       = obj.get("id").getAsString();
        noteText = obj.get("noteText").getAsString();
        author   = obj.get("author").getAsString();

        // Store these values in list or objects you want

        System.out.println(id);
        System.out.println(noteText);
        System.out.println(author);
    }

output :

0
Noteeeeeeee
John
1
Noteeeeeeee
Rob