org.json.JSONException: End of input at character

by

Change 

 JSONObject jsonObject = new JSONObject(result);

to 

result=getJSONUrl(url);  //<< get json string from server
JSONObject jsonObject = new JSONObject(result);

inside doInBackground method of DownloadJSONFileAsync because currently you are not making any post for getting Json data from the server and just trying to parse an empty string to json

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