import android.os.AsyncTask;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class JsonParserTask extends AsyncTask<String, Void, YourDataModel> {

    private JsonParserListener listener;

    public JsonParserTask(JsonParserListener listener) {
        this.listener = listener;
    }

    @Override
    protected YourDataModel doInBackground(String... urls) {
        String json = "";
        try {
            URL url = new URL(urls[0]);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();

            InputStream inputStream = connection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                json += line;
            }

            bufferedReader.close();
            inputStream.close();
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Gson gson = new Gson();
        YourDataModel dataModel = gson.fromJson(json, YourDataModel.class);
        return dataModel;
    }

    @Override
    protected void onPostExecute(YourDataModel dataModel) {
        if (listener != null) {
            listener.onJsonParsed(dataModel);
        }
    }

    public interface JsonParserListener {
        void onJsonParsed(YourDataModel dataModel);
    }
}