Develop Reference

Json paring with Recycler view

Here I am trying to display the name and price of the test.
and I'm taking a recycler view to do the same using the JET Parsing GET method.
But I'm not getting anything in my business and showing myself black there.
here is my code
please help me find the solution.
Model class
public class TestListsModel {
public String test_price;
public String testlist_id;
public String test_name;
}
This is my Adapter:
public class AdapterTestList extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private LayoutInflater inflater;
List<TestListsModel> data= Collections.emptyList();
TestListsModel current;
int currentPos=0;
// create constructor to innitilize context and data sent from MainActivity
public AdapterTestList(Context context, List<TestListsModel> data){
this.context=context;
inflater= LayoutInflater.from(context);
this.data=data;
}
// Inflate the layout when viewholder created
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.test_list_row, parent,false);
MyHolder holder=new MyHolder(view);
return holder;
}
// Bind data
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Get current position of item in recyclerview to bind data and assign values from list
MyHolder myHolder= (MyHolder) holder;
TestListsModel current=data.get(position);
myHolder.testName.setText(current.test_name);
myHolder.testPrice.setText( current.test_price);
// load image into imageview using glide
/* Glide.with(context).load("http://192.168.1.7/test/images/" + current.fishImage)
.placeholder(R.drawable.ic_img_error)
.error(R.drawable.ic_img_error)
.into(myHolder.ivFish);*/
}
// return total item from List
#Override
public int getItemCount() {
return data.size();
}
class MyHolder extends RecyclerView.ViewHolder{
TextView testName;
TextView testPrice;
// create constructor to get widget reference
public MyHolder(View itemView) {
super(itemView);
testName = (TextView) itemView.findViewById(R.id.test_name);
testPrice = (TextView) itemView.findViewById(R.id.price_name);
}
}
}
This is my Activity Class:
public class HealthServicesActivity extends AppCompatActivity implements View.OnClickListener {
SharePreferenceManager<LoginModel> sharePreferenceManager;
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView testListRecylerView;
private AdapterTestList mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health_services);
ButterKnife.bind(this);
sharePreferenceManager = new SharePreferenceManager<>(getApplicationContext());
dayTimeDisplay();
new AsyncLogin().execute();
}
private class AsyncLogin extends AsyncTask<String, String, String> {
//ProgressDialog pdLoading = new ProgressDialog(getApplicationContext());
HttpURLConnection conn;
URL url = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
/* pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();*/
}
#Override
protected String doInBackground(String... params) {
try {
String url_test="http://192.168.1.80/aoplnew/api/users/gettestlist/"+sharePreferenceManager.getUserLoginData(LoginModel.class).getResult().getCenterId();
// Enter URL address where your json file resides
// Even you can make call to php file which returns json data
//url = new URL("http://192.168.1.7/test/example.json");
url = new URL(url_test);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("GET");
// setDoOutput to true as we recieve data from json file
conn.setDoOutput(true);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return ("[]");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
#Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
//pdLoading.dismiss();
List<TestListsModel> data=new ArrayList<>();
//pdLoading.dismiss();
try {
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
TestListsModel testData = new TestListsModel();
testData.testlist_id= json_data.getString("testlist_id");
testData.test_name= json_data.getString("test_name");
testData.test_price= json_data.getString("test_price");
data.add(testData);
}
// Setup and Handover data to recyclerview
testListRecylerView = (RecyclerView)findViewById(R.id.test_list_recycler_view);
mAdapter = new AdapterTestList(HealthServicesActivity.this, data);
testListRecylerView.setAdapter(mAdapter);
testListRecylerView.setLayoutManager(new LinearLayoutManager(HealthServicesActivity.this));
} catch (JSONException e) {
Toast.makeText(HealthServicesActivity.this, e.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
Thanks in advance for any answer!

You need to set the setLayoutManager before the setting the adapter like below. In your code, you have setAdapter() before the setLayoutManager therefore your adapter not set properly.
Refer this for the further explanation https://developer.android.com/guide/topics/ui/layout/recyclerview
testListRecylerView = (RecyclerView)findViewById(R.id.test_list_recycler_view);
mAdapter = new AdapterTestList(HealthServicesActivity.this, data);
/**
* SET THE LAYOUT MANAGER BEFORE SETTING THE ADAPTER
*/
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(HealthServicesActivity.this);
testListRecylerView.setLayoutManager(mLayoutManager);
testListRecylerView.setItemAnimator(new DefaultItemAnimator());
/**
* AND THAN SET THE ADAPTER
*/
testListRecylerView.setAdapter(mAdapter);

AsyncTask not create GridView using BaseAdpter

Im new to android development have very basic knowledge of this whatever i have achieved till now is achieved using this website or youtube videos i'm stuck in AsyncTask (Earlier i was using .get() on Create View and it was working fine but UI Was blocked until task is finished. To Avoid UI Blocking i was advice to remove .get() function from OnCreateView() function now after removing this im not being able to get any data from AsyncTask). I did that but now i'm not being able to create view i did lots of research but unable to get this strength
Here is my Codes Please Help how to create view from this
OnCreateView() :-
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View GView = inflater.inflate(R.layout.fragment_dashboard, container, false);
progressBarHolder = (FrameLayout) GView.findViewById(R.id.progressBarHolder);
GridView gridView = (GridView) GView.findViewById(R.id.gridView);
//Toast.makeText(getActivity(),Json_String,Toast.LENGTH_LONG).show();
String finalResult = null;
try{
finalResult = String.valueOf(new JSONTask().execute("https://www.example.in/android_api/dashboard_data",JsonData()));
Toast.makeText(getActivity(),Json_String,Toast.LENGTH_LONG).show();
JSONObject parentObject = null;
parentObject = new JSONObject(finalResult);
if(((String) parentObject.names().get(0)).matches("error")){
JSONObject jObj = parentObject.getJSONObject("error");
errorThrow(jObj.getString("Description"));
} else if(((String) parentObject.names().get(0)).matches("success")){
JSONObject jObj = parentObject.getJSONObject("success");
JSONArray arrajson = jObj.getJSONArray("data");
String arrayCount = Integer.toString(arrajson.length());
String[] type = new String[arrajson.length()];
Integer[] count = new Integer[arrajson.length()];
for (int i=0; i<arrajson.length();i++){
JSONObject jsonObject = arrajson.getJSONObject(i);
type[i] = jsonObject.getString("type");
count[i] = jsonObject.getInt("count");
}
CustomAdpter customAdpter = new CustomAdpter(DashboardFragment.this,type,count);
gridView.setAdapter(customAdpter);
return GView;
}
} catch (JSONException e) {
e.printStackTrace();
}
return GView;
}
Base Adapter Code :-
class CustomAdpter extends BaseAdapter {
String[] type;
Integer[] count;
public CustomAdpter(DashboardFragment dashboardFragment, String[] type, Integer[] count){
this.count = count;
this.type = type;
}
#Override
public int getCount() {
return type.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = getLayoutInflater().inflate(R.layout.grid_single_itme,null);
TextView textView = (TextView) view.findViewById(R.id.TextView1);
TextView textView1 = (TextView) view.findViewById(R.id.textView2);
textView.setText(String.valueOf(count[i]));
textView1.setText(type[i]);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getActivity(),"Booking Item Clicked",Toast.LENGTH_LONG).show();
}
});
return view;
}
}
AsyncTask Code :-
public class JSONTask extends AsyncTask<String,String,String> {
private ProgressDialog mProgressDialog;
int progress;
public JSONTask(){
mProgressDialog = new ProgressDialog(getContext());
mProgressDialog.setMax(100);
mProgressDialog.setProgress(0);
}
#Override
protected void onPreExecute(){
mProgressDialog = ProgressDialog.show(getContext(),"Loading","Loading Data...",true,false);
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
final String finalJson = params[1];
String json = finalJson;
try{
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(5000);
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
connection.setRequestProperty("A-APK-API", "******");
connection.setRequestProperty("Authorization", "Basic **:**");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.connect();
OutputStream stream = connection.getOutputStream();
OutputStreamWriter streams = new OutputStreamWriter(stream, "UTF-8");
stream.write(json.getBytes("UTF-8"));
stream.close();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
while((line = reader.readLine()) != null){
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(connection != null){
connection.disconnect();
}
try {
if(reader != null) {
reader.close();
}
} catch (IOException e){
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(String result){
super.onPostExecute(result);
Json_String = result;
Toast.makeText(getContext(),result,Toast.LENGTH_LONG).show();
mProgressDialog.dismiss();
}
}
Please help me here

You cannot get a result from asynctask when you dont use .get().
So change that statement. Start only the asynctask.
Then put all the code after that line in onPostExecute() of the AsyncTask.
Thats all.

you should change way you are creating the Adapter and attaching
you should do this
1.At first get the data in List,ArrayList etc. via AsyncTask, doInBackGround method
then on the onPostExecute method retrieve the data and create Adapter and attach it to your View
While you are getting data you can show some ProgressDialog.
If your AsyncTask is in other separate class then use interface to get the data from your AsyncTask class
look at this https://stackoverflow.com/a/47373959/8197737

How to create Async Task RecyclerView Fragment Java [duplicate]

This question already has answers here:
How can I fix 'android.os.NetworkOnMainThreadException'?
(66 answers)
Closed 5 years ago.
LocationFragment class:
public class LocationFragment extends Fragment {
FragmentNameFactory nameFactory = new FragmentNameFactory();
List<LocationData> locationData;
LocationRecyclerAdapter locationRecyclerAdapter = new LocationRecyclerAdapter(locationData);
public LocationFragment(){
//Fragment needs a constructor, can be empty
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
((MainActivity) getActivity()).setFragmentName(nameFactory.getNameNL(6));
final View view = inflater.inflate(R.layout.flocationrecylce, container, false);
new JSONAsyncTask(new JSONCallBack(){
//This method updates the UI
#Override
public void success(JSONParser jsonParser) {
final JSONParser json = jsonParser;
//This part makes sure it is able to multi thread.
//In case this method is missing the application will crash upon refreshing this fragment
locationData = json.storeJSONData();
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.locationRecyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(locationRecyclerAdapter);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(linearLayoutManager);
}
//In case of failure the method sprints the log to the debugging console
#Override
public void failed() {
System.out.print("Failure");
}
//Sends the task to the doInBackground method inside RSSReaderAsync, which execute the code inside RSSReader
}).execute("");
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstance){
super.onViewCreated(view, savedInstance);
}
#Override
public void onActivityCreated(Bundle savedInstance){
super.onActivityCreated(savedInstance);
}
}
JSONParser class:
public class JSONParser {
String url;
String requestMethod;
List<LocationData> locations;
public JSONParser(String url, String requestMethod){
this.url = url;
this.requestMethod = requestMethod;
locations = storeJSONData();
}
private String read(BufferedReader bufferedReader) throws IOException {
//Creates new StringBuilder to avoid escaping chars
StringBuilder stringBuilder = new StringBuilder();
//Creates new variable
String currentLine;
//Gets the currentLine
while((currentLine = bufferedReader.readLine()) !=null ){
//Adds the currentLine to the stringBuild if the currentLine is not null
stringBuilder.append(currentLine);
}
//Returns the StringBuilder is String format
return stringBuilder.toString();
}
public JSONObject sendRequest() throws IOException, JSONException {
//Get the URL from the constructor
URL url = new URL(this.url);
//Opens the connection
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//Sets the requestMethod
connection.setRequestMethod(this.requestMethod);
//Sets the requestProperties
connection.setRequestProperty("Content-type", "application/JSON");
//Tries to read the through the BufferedReader
try {
//Creates new BufferedReader & InputStreamReader which get the input of the connection
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
//Stores the output of the connection in a string
String jsonText = read(bufferedReader);
//Creates a new JSON object from the above String
JSONObject json = new JSONObject(jsonText);
//Returns the JSON Object
return json;
} finally {
//Disconnects from the URL
connection.disconnect();
}
}
public List<LocationData> storeJSONData(){
//Creates temporary List
List<LocationData> tempList = new ArrayList<>();
try{
//Sends request
JSONObject json = sendRequest();
//For loop to parse all the data from the request
for(Integer i =0; i < json.getJSONArray("response").length(); i++){
tempList.add(new LocationData(json.getJSONArray("response").getJSONObject(i).getString("name"),
json.getJSONArray("response").getJSONObject(i).getString("zipcode"),
json.getJSONArray("response").getJSONObject(i).getString("street"),
json.getJSONArray("response").getJSONObject(i).getString("streetnumber"),
json.getJSONArray("response").getJSONObject(i).getDouble("longitude"),
json.getJSONArray("response").getJSONObject(i).getDouble("latitude"),
json.getJSONArray("response").getJSONObject(i).getString("city")));
}
}
catch (IOException e){
System.out.print(e);
}
catch (JSONException e){
System.out.print(e);
}
//Returns the list
return tempList;
}
}
JSONCallBack interface:
public interface JSONCallBack {
void success(JSONParser jsonParser);
void failed();
}
JSONAsyncTask class:
public class JSONAsyncTask extends AsyncTask<String, Integer, Integer> {
private JSONCallBack jsonCallBack;
public JSONAsyncTask(JSONCallBack jsonCallBack) {
this.jsonCallBack = jsonCallBack;
}
#Override
protected Integer doInBackground(String... params) {
JSONParser parser = new JSONParser("http://grwn.ddns.net:1337/locations", "POST");
jsonCallBack.success(parser);
return null;
}
}
I'm trying to create a Async task inside a Fragment. The way I did this works for my RSS reader but somehow it doesn't work for my JSONParser. I tried almost each answer of this topic How to fix android.os.NetworkOnMainThreadException?
No of those options fix my issue:
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)
at java.net.SocketInputStream.read(SocketInputStream.java:150)
at java.net.SocketInputStream.read(SocketInputStream.java:120)
at com.android.okhttp.okio.Okio$2.read(Okio.java:136)
at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
at com.android.okhttp.okio.RealBufferedSource.exhausted(RealBufferedSource.java:60)
at com.android.okhttp.internal.http.HttpConnection.isReadable(HttpConnection.java:155)
at com.android.okhttp.Connection.isReadable(Connection.java:417)
at com.android.okhttp.OkHttpClient$1.isReadable(OkHttpClient.java:93)
at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:339)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:329)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:247)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:405)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:243)
at com.example.sande.androidhro.JSONParser.sendRequest(JSONParser.java:69)
at com.example.sande.androidhro.JSONParser.storeJSONData(JSONParser.java:92)
at com.example.sande.androidhro.LocationFragment$1$1.run(LocationFragment.java:46)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:6236)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)
I know this has something to do with the Async task but I don't know what I'm doing wrong

The sendRequest() function must happen in the background (aka doinbackground in the asynctask)
All because you need to make network calls on back thread,
Having said that you can use Volley or Retrofit Libraries instead for easier network calls
Volley - https://developer.android.com/training/volley/index.html
Retrofit - http://square.github.io/retrofit/
EDIT :
this is your onsuccess:
#Override
public void success(JSONParser jsonParser) {
final JSONParser json = jsonParser;
**locationData = json.storeJSONData();**
RecyclerView recyclerView = (RecyclerView)
view.findViewById(R.id.locationRecyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(locationRecyclerAdapter);
LinearLayoutManager linearLayoutManager = new
LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(linearLayoutManager);
You are now on mainthread(that's why you can change views and do findviewbyid and so on ... )
Than you try
locationData = json.storeJSONData();
Which calls sendrequest again , this time on mainthread , like Slevin tried to imply , this will fix the current crash .

How to make sure AsyncTask is executed

I'm pretty new to Android development, I feel like I have a relatively simple question here and have managed to tie down the more complex parts but overlook the more simple bits. I've setup an ImageAdapter class which handles displaying images into a GridView in another one of my Fragments. Originally I was following a tutorial that simply displayed a list of items in an Array.
I'm using an AsyncTask to populate an ArrayList, and then converting the ArrayList to a standard array that Picasso can deal with when displaying content.
My problem is that the AsyncTask section of my ImageAdapter is just not getting executed, thus my imageArr[] that Picasso uses is just remaining empty.
How can I make sure that the AsyncTask section of my Adapter is actually executed?
I've tried this, but it just doesn't seem to be working and I think I'm a little bit off...
public void onCreate() {
new GetProjects().execute();
}
I've attached my code bellow, any help would be really appreciated!
Note; ServiceHandler is just retrieving the data at the URL and then turning it into a string which can be parsed.
public class ImageAdapter extends BaseAdapter {
//JSON URL
private static String url = "www.myjsonsourceurl.com";
//JSON NODES
private static final String TAG_LOGO = "logopath";
ArrayList<String> imageUrls = new ArrayList<String>();
String[] imageArr = imageUrls.toArray(new String[imageUrls.size()]);
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return imageArr.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public void onCreate() {
new GetProjects().execute();
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
// if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(185, 185));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(3, 3, 3, 3);
} else {
imageView = (ImageView) convertView;
}
Picasso.with(mContext).setIndicatorsEnabled(true);
Picasso.with(mContext).setLoggingEnabled(true);
Picasso.with(mContext).load(imageArr[position]).placeholder(R.drawable.ajaxloader).error(R.drawable.imageunavailable).into(imageView);
return imageView;
}
// references to our images
//ASYNC task to get json by making HTTP call
public class GetProjects extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Nothing right now
}
#Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONArray json = new JSONArray(jsonStr);
// looping through All Applications
for (int i = 0; i < json.length(); i++) {
JSONObject p = json.getJSONObject(i);
String logopath = p.getString(TAG_LOGO);
imageUrls.add(logopath);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
}
}
}

You need to call in activity or fragment where list is defined not in adapter like this. move asynctask class to your activity and call it from there.
AsyncTask gives methods
onPreExecute() and onPostExecute() where you can toast message that task is started or completed. And you should call setAdapter() in onPostExecute() of class.

There`s no onCreate method for BaseAdapter which you can override. Execute your code
new GetProjects().execute();
either in contructor or call your onCreate function (I suggest changing its name) manualy from outside of the adapter.

Android listview not getting populated with data

I am new to Android Studio and have a simple android view i am working on. A button click makes a call to the foursquare API and get backresults for starbucks around my location that I parse and am trying to set to the adapter for the listbox on the same view. If i put a breakpoint in the OnPostExecute() I see the mFoursquare adapter that I set for the listview has two json string results in the mFoursquareAdapter , I even call the
mFoursquareAdapter.notifyDataSetChanged();
in it but the view does not get refreshed with the results. I have posted the code below. Can anyone please point out what I am doing wrong or need to change since I already have the results and need to get this done...Your help and feedback very much appreciated! thanks
public class FoursquareInfoFragment extends android.app.Fragment {
private ArrayAdapter<String> mFoursquareAdapter;
public FoursquareInfoFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Dummy data for the ListView. Here's the sample weekly forecast
String[] data = {
"Sample Foursquare Data",
};
List<String> foursquareList = new ArrayList<String>(Arrays.asList(data));
mFoursquareAdapter = new ArrayAdapter<String>(
getActivity(), // the current context ie the activity
R.layout.fragment_my, // the name of the layout Id
R.id.textViewFoursquare, // the Id of the TextView to populate
foursquareList);
View rootView = inflater.inflate(R.layout.fragment_my, container, false);
//View resultsView = inflater.inflate(R.layout.results, container, false);
View resultsView = inflater.inflate(R.layout.fragment_my, container, false);
ListView listView = (ListView) resultsView.findViewById(R.id.listview_FoursquareInfo);
listView.setAdapter(mFoursquareAdapter);
Button btnGetFoursquareData = (Button) rootView.findViewById(R.id.btnFoursquare);
btnGetFoursquareData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FetchFoursquareDataTask fetch = new FetchFoursquareDataTask();
fetch.execute("Starbucks");
}
});
return rootView;
}
public class FetchFoursquareDataTask extends AsyncTask<String, Void, String[]> {
private final String LOG_TAG = FetchFoursquareDataTask.class.getSimpleName();
#Override
protected void onPostExecute(String[] result) {
if (result != null) {
mFoursquareAdapter.clear();
for (String ItemStr : result) {
mFoursquareAdapter.add(ItemStr);
}
mFoursquareAdapter.notifyDataSetChanged();
}
}
#Override
protected String[] doInBackground(String... params) {
// If there's no venue category, theres nothing to look up. Verify the size of the params.
if (params.length == 0) {
return null;
}
// These two need to be declared outside the try/catch
// so that they can be closed in the finally block.
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String foursquareJsonStr = null;
try {
// Build Foursquare URI with Parameters
final String FOURSQUARE_BASE_URL =
"https://api.foursquare.com/v2/venues/search";
final String client_id = "client_id";
final String client_secret = "client_secret";
final String v = "20130815";
final String near = "Dunwoody, Ga";
final String query = "Starbucks";
final String limit = "2";
Uri builtUri = Uri.parse(FOURSQUARE_BASE_URL).buildUpon()
.appendQueryParameter("client_id", client_id)
.appendQueryParameter("client_secret", client_secret)
.appendQueryParameter("v", v)
.appendQueryParameter("near", near)
.appendQueryParameter("query", query)
.appendQueryParameter("limit", limit)
.build();
URL url = new URL(builtUri.toString());
// Create the request to Foursquare, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
foursquareJsonStr = null;
return null;
}
foursquareJsonStr = buffer.toString();
Log.v(LOG_TAG, "Foursquare JSON String: " + foursquareJsonStr);
} catch (IOException e) {
Log.e(LOG_TAG, "Error ", e);
// If the code didn't successfully get the fpursquare data, there's no point in attempting
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("PlaceholderFragment", "Error closing stream", e);
}
}
}
String[] list = new String[]{"", ""};
try {
JSONObject foursquareJson = new JSONObject(foursquareJsonStr);
JSONObject responseObject = (JSONObject) foursquareJson.get("response");
JSONArray foursquareArray = responseObject.getJSONArray("venues");
list = new String[foursquareArray.length()];
for (int i = 0; i < foursquareArray.length(); i++) {
list[i] = foursquareArray.get(i).toString();
}
return list;
} catch (JSONException e) {
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
} finally {
Log.e(LOG_TAG, "ba");
return list;
}
}
}
}

This
mFoursquareAdapter.add(ItemStr);
Should be
foursquareList.add(ItemStr)
And you'll need to declare foursquareList properly (as a field).
You should also declare your Adapter as a field variable as well, just in case you need to reference it later