How To Just Read Wanted Data From Json In Java & Android

I asked a similar question few days ago about how i could read just wanted data from JSON file in AngularJS, but i gonna do this job in java in android, so I have a problem in read

Solution 1:

change your try block to

while ((line = reader.readLine()) != null) {
            buffer.append(line+"\n");
        }

        Log.d("Response: ", "> " + line);
        try {
             JSONObject  jsonRootObject = newJSONObject(line);

             JSONArray jsonArray = jsonRootObject.optJSONArray("results");
             for(int i=0; i < jsonArray.length(); i++){
             JSONObject jsonObject = jsonArray.getJSONObject(i);
             data = jsonObject.getString("formatted_address")

          }

          } catch (JSONException e) {e.printStackTrace();}
         return data;

Now you will have valid string to JSONObject conversion since previously you parsing incomplete string in while loop which isnt valid json.

Solution 2:

You need to wait until all the input has been read. In other words, all of the JSON Handling code should be out of the while loop.

Solution 3:

You can use the JSON library to parse this object:

publicclassJsonValue {
    publicstatic void main(String[] args) throwsJSONException {
        String jsonString ="{ \"field1\" : \"value1\", \"city\" : \"New York\", \"address\" : \"address1\" }";
        JSONObject jsonObject = new JSONObject(jsonString);
        String city = jsonObject.getString("city");
        System.out.println(city);
     }
}

Solution 4:

Or you can use GSON:

Gson gson = new Gson();
Type type = new TypeToken<List<AddressComponents>>() {}.getType();
List<AddressComponents> fromJson = gson.fromJson(json, type);

http://www.vogella.com/tutorials/JavaLibrary-Gson/article.html

Solution 5:

First create this two models:

publicclassResultModel{
    publicstring formatted_address;
}

publicclassResponseModel{
    public List<ResultModel> results;
}

then get your addresses with:

Gsongson=newGson();
ResponseModelresponse= gson.fromJson(json, ResponseModel.class);

response.results // this is your list of "formatted addresses"

Can be iterated with for cycle or used anywhere. All other json will be ignored.

make sure to include in your gradle:

compile'com.google.code.gson:gson:2.4'