Develop Reference

Why this for loop is exiting before the end?

I have this for loop which fill Mymatrix (17,27) from a JSON file.
The problem is that when I debug it, I find that it gets out the loop every time when i=96 ie j=3 and k=15. (I mention also that len=459)
try
{
JSONObject myjson = new JSONObject(the_json);
JSONArray nameArray = myjson.Names();
len = nameArray.Length();
for (int i = 0; i < len; i++)
{
name = nameArray.GetString(i);
JSONArray json_array = myjson.GetJSONArray(name);
j = (int)(Integer.ValueOf(name)) / 27;
k = (int)(Integer.ValueOf(name)) % 27;
myMatrix[j, k] = json_array.GetDouble(a); //a=0
}
}
catch (JSONException e)
{
e.PrintStackTrace();
}
Can you please help and figure out why I am having this problem?

Decode JSON String in Android

I have a contacts which is in the form of JSON. Now I want to decode them into String array. There are two arrays; names and phones. I'm using this code:
String[] names;
String[] phones;
String test = "[{\"name\":\"A\",\"phone\":\"911\"},{\"name\":\"A1\",\"phone\":\"911\"},{\"name\":\"Abid\",\"phone\":\"371812\"}]";
try {
JSONArray jsonArray = new JSONArray(test);
JSONObject jsonObject = new JSONObject(jsonArray.toString());
Log.i("INFO", String.valueOf(jsonObject.length()));
} catch (JSONException e) {
e.printStackTrace();
}
This generates an error. How can I add all names in names array and all phones in phones array. Like names[0] is assigned A which is a first name and phones[0] assigned 911 which is first phone number corresponding to first name. How can I do that, I'm new in android?

The problem is in this line
JSONObject jsonObject = new JSONObject(jsonArray.toString());
you are trying to convert JSONArray in JSONObject , which you can't. if you want to access JSONObject inside of JSONArray you have to loop through each, or you can get specific object by it's index.
String[] names;
String[] phones;
String test = "[{\"name\":\"A\",\"phone\":\"911\"},{\"name\":\"A1\",\"phone\":\"911\"},{\"name\":\"Abid\",\"phone\":\"371812\"}]";
try {
JSONArray jsonArray = new JSONArray(test);
phones = names = new String[jsonArray.length()];
for(int i = 0 ; i < jsonArray.length(); i ++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
names[i] = jsonObject.getString("name");
phones[i] = jsonObject.getString("phone");
Log.i("INFO", "name : " + jsonObject.getString("name") + " , phone : " + jsonObject.getString("phone"));
}
} catch (JSONException e) {
e.printStackTrace();
}

You can't convert json arrya to json object like that:
try {
JSONArray jsonArray = new JSONArray(test);
for(int i=0; i<jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
// Your code goes here..
}
} catch (JSONException e) {
e.printStackTrace();
}

here is the required code.
ArrayList<String> names = new ArrayList<>();
ArrayList<String> phones = new ArrayList<>();
String test = "[{\"name\":\"A\",\"phone\":\"911\"},{\"name\":\"A1\",\"phone\":\"911\"},{\"name\":\"Abid\",\"phone\":\"371812\"}]";
try {
JSONArray jsonArray = new JSONArray(test);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.getString("name");
String phone = jsonObject.getString("phone");
names.add(name);
phones.add(phone);
Log.i("INFO", name + ", " + phone);
}
} catch (JSONException e) {
e.printStackTrace();
}
above you have used simple arrays they can store data only of fixed size. But arrayList and List can store data of variable size or you do not need to fix their size.

Parsing JSON for android the JSON is valid but cant get anything back

I'm having trouble getting the String "lf" in this case North Atlantic Treaty Organization
[
{
"sf": "NATO",
"lfs": [
{
"lf": "North Atlantic Treaty Organization",
"freq": 13,
"since": 2001,
"vars": [
{
"lf": "North Atlantic Treaty Organization",
"freq": 13,
"since": 2001
}
]
}
]
}
]
//MY CODE
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray(ITEM_TAG);
for(int i = 0; i < jsonArray.length(); i++) {
JSONObject c = jsonArray.getJSONObject(i);
String name = c.getString("lf");
acronyms = new ArrayList<>();
acronyms.add(name);
}
} catch (Exception e) {
}

try {
JSONArray jsonArray1 = new JSONArray(JsonString);
for (int i = 0; i <= jsonArray1.length(); i++) {
JSONObject jsonObject2 = jsonArray1.getJSONObject(i);
String mStrSf = jsonObject2.getString("sf");
Toast.makeText(getApplicationContext(),mStrSf.toString(), Toast.LENGTH_LONG).show();
JSONArray jsonArray3 = jsonObject2.getJSONArray("lfs");
for (int j = 0; j <= jsonArray3.length(); j++) {
JSONObject jsonObject4 = jsonArray3.getJSONObject(j);
String mStrIf = jsonObject4.getString("lf");
String mStrFreq = jsonObject4.getString("freq");
String mStrSince = jsonObject4.getString("since");
Toast.makeText(getApplicationContext(),mStrIf+"\n"+mStrFreq+"\n"+mStrSince, Toast.LENGTH_LONG).show();
JSONArray jsonArray5 = jsonObject4.getJSONArray("vars");
for (int k = 0; k <= jsonArray5.length(); k++) {
JSONObject jsonObject6 = jsonArray5.getJSONObject(k);
String mStrIf1 = jsonObject6.getString("lf");
String mStrFreq1 = jsonObject6.getString("freq");
String mStrSince1 = jsonObject6.getString("since");
Toast.makeText(getApplicationContext(),mStrIf1+"\n"+mStrFreq1+"\n"+mStrSince1, Toast.LENGTH_LONG).show();
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}

You are interpreting the json in a wrong way... if you analyse the json chain you will get this:
as you can see you have an array inside and array...
hope the picture helps you to see it better.

You have to again loop through the jsonArray to get "lf" key value.
Try this...
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray(ITEM_TAG);
for(int i = 0; i < jsonArray.length(); i++) {
JSONObject c = jsonArray.getJSONObject(i);
JSONArray array = c.getJSONArray("lfs");
for(int j=0;j<array.length();j++){
JSONObject obj = array.getJSONObject(j);
String name = obj.getString("lf");
}
}
} catch (Exception e) {
}

how I can access data from a JSONArray in Android?

how I can access data from a JSONArray? It is this and contains this information:
"deadlines": [
{
"start": 1439539200,
"end": 1439542800
},
{
"start": 1440144000,
"end": 1440147600
},
{
"start": 0,
"end": 0
}
]
I need to have in a String tag each item "start". Thanks
EDIT
My code is this:
JSONArray array = moduleObject.specialForcedConf;
// array = [{"deadlines":[{"start":1439539200,"end":1439542800},{"start":1440144000,"end":1440147600},{"start":0,"end":0}]}]
for (int j=0; j < array.length(); j++)
{
try
{
JSONObject obj = array.getJSONObject(j);
String start = obj.getString("start");
String end = obj.getString("end");
Log.e("", "start = " + start);
}
catch (JSONException e)
{
Log.e("", "error = " + e.getMessage());
}
}
I get this error:
"error = No value for start"

Do this
JSONArray array = moduleObject.specialForcedConf;
// array = [{"deadlines":[{"start":1439539200,"end":1439542800},{"start":1440144000,"end":1440147600},{"start":0,"end":0}]}]
JSONArray jArray = array.getJSONObject(0).getJSONArray("deadlines");
for (int i = 0; i < jArray.length(); i++) // assuming your array is jArray
{
try
{
JSONObject obj = jArray.getJSONObject(i);
String start= obj.getString("start"); // store in an ArrayList
String end = obj.getString("end"); //// store in an ArrayList
}
catch (JSONException e)
{
// Error
}
}

JSONArray mJsonArray=new JSONArray("Deadlines");
for(int i=0;i<mJsonArray.length();i++){
JSONObject mJsonObject=new JSONObject(mJsonArray.get(i).toString));
String start = mJsonObject.optString("start","");
String end = mJsonObject.optString("end","");
}

Try this:
StringBuilder sb = new StringBuilder();
JSONArray arr = new JSONArray("deadlines");
for(int i=0;i<arr.length;i++){
JSONObject obj = arr.getJSONObject(i);
sb.append(obj.get("start").toString());
sb.append(",");
}
String strStartTag = sb;

JSONArray ja = new JSONArray(yourjsondata));
for (int i = 0; i < ja.length(); i++) {
JSONObject jo_feed = new JSONObject(ja.get(i).toString());
String start = jo_feed.getString("start");
}

Nested JSONArray Record Parsing Issue Android

I am making a App which receives a JSON Data From Server, User will select a value from Spinner like 0,1,2... and so on, On the Basis of number selection JSON will return a data from user defined index like 0,1.. i don't know how to parse a inner JSON Data in Android
json = new JSONObject(JSONParser.Result);
JSONArray jArray = json.getJSONArray("data");
StopElement _stop = new StopElement();
Log.d("JSON Algo Result", json.toString());
if (jArray!=null) {
for (int i = 0; i < jArray.length(); i++) {
jsonarray = jArray.getJSONArray(i);
if (jsonarray != null) {
for (int j = 0; j < jsonarray.length(); i++){
if(i==0) {
jsonarray = jArray.getJSONArray(j);
_stop.setName(jsonarray.getString(0));
StopElement.Stop_name_list.add(_stop.getName());
}
}
} else {
break;
}
}
} else {
return null;
}
**JSON Data**
[[["Sadiqabad Chowk","33.634525","73.074326","suzk1"],["Chungi No 8","33.627262","73.093567","suzk1"],["Jahaz Ground","33.628395","73.101936","suzk1"],["Khana Bridge","33.629967","73.112823","suzk1"],["Kuri Road","33.643162","73.102928","21"],["Faizabad","33.663212","73.084801","21"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk1"],["Petrol Pump","33.634109","73.076363","suzk1"],["Chandni Chowk","33.631584","73.072563","suzk1"],["Rahmanabad","33.639065","73.075714","3"],["Passport Office","33.642410","73.076981","3"],["Shamsabad","33.650101","73.079994","3"],["Faizabad","33.663212","73.084801","3"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk1"],["Chungi No 8","33.627262","73.093567","suzk1"],["Jahaz Ground","33.628395","73.101936","suzk1"],["Khana Bridge","33.629967","73.112823","suzk1"],["Zia Masjid","33.637196","73.107407","124-A"],["Kuri Road","33.643162","73.102928","124-A"],["Dhok Kala Khan","33.653118","73.095444","124-A"],["Faizabad","33.663212","73.084801","124-A"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk1"],["Chungi No 8","33.627262","73.093567","suzk1"],["Jahaz Ground","33.628395","73.101936","suzk1"],["Khana Bridge","33.629967","73.112823","suzk1"],["Zia Masjid","33.637196","73.107407","136"],["Kuri Road","33.643162","73.102928","136"],["Iqbal Town","33.644279","73.100113","136"],["Dhok Kala Khan","33.653118","73.095444","136"],["Faizabad","33.663212","73.084801","136"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk13"],["Dhok Ali Akbar","33.636997","73.092117","suzk13"],["Highway Stop","33.679722","73.075584","suzk13"],["Bhinder","33.556244","73.167946","suzk3"],["Lohi Bher","33.586273","73.145493","124"],["Wild Life Park","33.578770","73.132309","124"],["Airport Chowk","33.593803","73.139938","124"],["Gangal","33.612591","73.125801","124"],["Khana Bridge","33.629967","73.112823","124"],["Zia Masjid","33.637196","73.107407","124"],["Kuri Road","33.643162","73.102928","124"],["Dhok Kala Khan","33.653118","73.095444","124"],["Faizabad","33.663212","73.084801","124"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk13"],["Petrol Pump","33.634109","73.076363","suzk13"],["Chandni Chowk","33.631584","73.072563","suzk13"],["Central Hospital","33.628784","73.070641","suzk13"],["Naz Cinema","33.623936","73.067802","suzk13"],["Waris Khan","33.620728","73.066078","suzk13"],["Comittee Chowk","33.612946","73.065193","suzk13"],["Liaquat Bagh","33.606808","73.064835","suzk13"],["Marir Hassan","33.596905","73.064445","suzk7"],["Punjab House","33.592701","73.065453","suzk7"],["Jhanda","33.588970","73.076195","suzk7"],["Raheemabad","33.599159","73.080048","21"],["Airport","33.603565","73.097137","21"],["Tajabad","33.601593","73.126213","21"],["Koral Chowk","33.605282","73.131279","21"],["Khana Bridge","33.629967","73.112823","21"],["Kuri Road","33.643162","73.102928","21"],["Faizabad","33.663212","73.084801","21"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk13"],["Petrol Pump","33.634109","73.076363","suzk13"],["Chandni Chowk","33.631584","73.072563","suzk13"],["Central Hospital","33.628784","73.070641","suzk13"],["Naz Cinema","33.623936","73.067802","suzk13"],["Waris Khan","33.620728","73.066078","suzk13"],["Comittee Chowk","33.612946","73.065193","suzk13"],["Liaquat Bagh","33.606808","73.064835","suzk13"],["Medical College","33.602753","73.067200","29"],["Sir Syed Boys School","33.609600","73.078766","29"],["Fauji Tower","33.606770","73.084106","29"],["Chaklala Station","33.601013","73.095924","29"],["Raheemabad","33.599159","73.080048","29"],["Airport","33.603565","73.097137","21"],["Tajabad","33.601593","73.126213","21"],["Koral Chowk","33.605282","73.131279","21"],["Khana Bridge","33.629967","73.112823","21"],["Kuri Road","33.643162","73.102928","21"],["Faizabad","33.663212","73.084801","21"]],[["Sadiqabad Chowk","33.634525","73.074326","suzk13"],["Petrol Pump","33.634109","73.076363","suzk13"],["Chandni Chowk","33.631584","73.072563","suzk13"],["Central Hospital","33.628784","73.070641","suzk13"],["Naz Cinema","33.623936","73.067802","suzk13"]]]

this will work definitely for you.
String data= "[[['Jahaz Ground','33.628395','73.101936','suzk1'],['Khana Bridge','33.628395','73.101936','suzk1']]]";
try {
JSONArray json = new JSONArray(data);
JSONArray aray = (JSONArray)json.get(0);
for(int i =0; i< aray.length();i++){
JSONArray object = (JSONArray)aray.get(i);
String title = (String)object .get(0);
String lat = (String)object.get(1);
String lng = (String)object.get(2);
String com = (String)object.get(3);
}
} catch (JSONException e) {
e.printStackTrace();
}

try this way,
U can get result as per your request
private String jsonString="[[['Sadiqabad Chowk','33.634525','73.074326','suzk1'],['Chungi No 8','33.627262','73.093567','suzk1'],['Jahaz Ground','33.628395','73.101936','suzk1'],['Khana Bridge','33.629967','73.112823','suzk1'],['Kuri Road','33.643162','73.102928','21'],['Faizabad','33.663212','73.084801','21']],[['Sadiqabad Chowk','33.634525','73.074326','suzk1'],['Petrol Pump','33.634109','73.076363','suzk1'],['Chandni Chowk','33.631584','73.072563','suzk1'],['Rahmanabad','33.639065','73.075714','3'],['Passport Office','33.642410','73.076981','3'],['Shamsabad','33.650101','73.079994','3'],['Faizabad','33.663212','73.084801','3']],[['Sadiqabad Chowk','33.634525','73.074326','suzk1'],['Chungi No 8','33.627262','73.093567','suzk1'],['Jahaz Ground','33.628395','73.101936','suzk1'],['Khana Bridge','33.629967','73.112823','suzk1'],['Zia Masjid','33.637196','73.107407','124-A'],['Kuri Road','33.643162','73.102928','124-A'],['Dhok Kala Khan','33.653118','73.095444','124-A'],['Faizabad','33.663212','73.084801','124-A']],[['Sadiqabad Chowk','33.634525','73.074326','suzk1'],['Chungi No 8','33.627262','73.093567','suzk1'],['Jahaz Ground','33.628395','73.101936','suzk1'],['Khana Bridge','33.629967','73.112823','suzk1'],['Zia Masjid','33.637196','73.107407','136'],['Kuri Road','33.643162','73.102928','136'],['Iqbal Town','33.644279','73.100113','136'],['Dhok Kala Khan','33.653118','73.095444','136'],['Faizabad','33.663212','73.084801','136']],[['Sadiqabad Chowk','33.634525','73.074326','suzk13'],['Dhok Ali Akbar','33.636997','73.092117','suzk13'],['Highway Stop','33.679722','73.075584','suzk13'],['Bhinder','33.556244','73.167946','suzk3'],['Lohi Bher','33.586273','73.145493','124'],['Wild Life Park','33.578770','73.132309','124'],['Airport Chowk','33.593803','73.139938','124'],['Gangal','33.612591','73.125801','124'],['Khana Bridge','33.629967','73.112823','124'],['Zia Masjid','33.637196','73.107407','124'],['Kuri Road','33.643162','73.102928','124'],['Dhok Kala Khan','33.653118','73.095444','124'],['Faizabad','33.663212','73.084801','124']],[['Sadiqabad Chowk','33.634525','73.074326','suzk13'],['Petrol Pump','33.634109','73.076363','suzk13'],['Chandni Chowk','33.631584','73.072563','suzk13'],['Central Hospital','33.628784','73.070641','suzk13'],['Naz Cinema','33.623936','73.067802','suzk13'],['Waris Khan','33.620728','73.066078','suzk13'],['Comittee Chowk','33.612946','73.065193','suzk13'],['Liaquat Bagh','33.606808','73.064835','suzk13'],['Marir Hassan','33.596905','73.064445','suzk7'],['Punjab House','33.592701','73.065453','suzk7'],['Jhanda','33.588970','73.076195','suzk7'],['Raheemabad','33.599159','73.080048','21'],['Airport','33.603565','73.097137','21'],['Tajabad','33.601593','73.126213','21'],['Koral Chowk','33.605282','73.131279','21'],['Khana Bridge','33.629967','73.112823','21'],['Kuri Road','33.643162','73.102928','21'],['Faizabad','33.663212','73.084801','21']],[['Sadiqabad Chowk','33.634525','73.074326','suzk13'],['Petrol Pump','33.634109','73.076363','suzk13'],['Chandni Chowk','33.631584','73.072563','suzk13'],['Central Hospital','33.628784','73.070641','suzk13'],['Naz Cinema','33.623936','73.067802','suzk13'],['Waris Khan','33.620728','73.066078','suzk13'],['Comittee Chowk','33.612946','73.065193','suzk13'],['Liaquat Bagh','33.606808','73.064835','suzk13'],['Medical College','33.602753','73.067200','29'],['Sir Syed Boys School','33.609600','73.078766','29'],['Fauji Tower','33.606770','73.084106','29'],['Chaklala Station','33.601013','73.095924','29'],['Raheemabad','33.599159','73.080048','29'],['Airport','33.603565','73.097137','21'],['Tajabad','33.601593','73.126213','21'],['Koral Chowk','33.605282','73.131279','21'],['Khana Bridge','33.629967','73.112823','21'],['Kuri Road','33.643162','73.102928','21'],['Faizabad','33.663212','73.084801','21']],[['Sadiqabad Chowk','33.634525','73.074326','suzk13'],['Petrol Pump','33.634109','73.076363','suzk13'],['Chandni Chowk','33.631584','73.072563','suzk13'],['Central Hospital','33.628784','73.070641','suzk13'],['Naz Cinema','33.623936','73.067802','suzk13']]]";
private void getJSONResult(String jsonString) {
// TODO Auto-generated method stub
try {
JSONArray jsonArray = new JSONArray(jsonString);
// i.e. the JsonMainArray
JSONArray JsonInnerArray= (JSONArray)jsonArray.get(0);
// i.e. the JsonInnerArray
for(int i =0; i< JsonInnerArray.length();i++){
JSONArray jsonObject = (JSONArray)JsonInnerArray.get(i);
//i.e. the jsonObject of JsonInnerArray
String title = (String)jsonObject .get(0);
String latitude = (String)jsonObject.get(1);
String longitude = (String)jsonObject.get(2);
String companyName = (String)jsonObject.get(3);
}
} catch (JSONException e) {
e.printStackTrace();
}
}

I Solved My Issue like this
try {
int count = 0;
if (success == 1) {
json = new JSONObject(JSONParser.Result);
jArray = json.getJSONArray("data");
StopElement _stop = new StopElement();
for (int i = 0; i < jArray.length(); i++) {
count = count + 1;
// Log.d("Counter", String.valueOf(count));
get_path.add(String.valueOf(count));
jsonarray = jArray.getJSONArray(i);
Log.d("path Array", jsonarray.toString());
if (getitemno>0) {
getpath = jArray.getJSONArray(getitemno);
for (int j = 0; j < getpath.length(); j++) {
getresult = getpath.getJSONArray(j);
_stop.setName(getresult.getString(0));
_map.setLat(getresult.getDouble(1));
_map.setLng(getresult.getDouble(2));
StopElement.Stop_name_list.add(_stop.getName());
MapCoordinatesElement.Lat.add(_map.getLat());
MapCoordinatesElement.Lng.add(_map.getLng());
//Log.d("Stop names", _stop.getName());
// Log.d("Index Array", getpath.toString());
}
} else {
getpath = jArray.getJSONArray(0);
for (int j = 0; j < getpath.length(); j++) {
getresult = getpath.getJSONArray(j);
_stop.setName(getresult.getString(0));
_map.setLat(getresult.getDouble(1));
_map.setLng(getresult.getDouble(2));
StopElement.Stop_name_list.add(_stop.getName());
MapCoordinatesElement.Lat.add(_map.getLat());
MapCoordinatesElement.Lng.add(_map.getLng());
//Log.d("Stop names", _stop.getName());
//Log.d("Index Array", getpath.toString());
}
}
}
// Log.d("Stop names of Algo", StopElement.Stop_name_list.toString());
// Log.d("Index Stop names", StopElement.Stop_name_list.toString());
} catch (JSONException e) {
e.printStackTrace();
}