Develop Reference

Unable to parse JSON data into Listview

im trying to parse data from SQL Database into Listview.
My PHP script is working because if i run it in the browser i get the content.
If im trying to get the data from my SQL Databse into the listview my app shows nothing.
Here is my MainActivity:
public class Locations extends AppCompatActivity implements AdapterView.OnItemClickListener {
ArrayList<productforloc> arrayList;
ListView lv;
private String TAG = Locations.class.getSimpleName();
private TextView addressField; //Add a new TextView to your activity_main to display the address
private LocationManager locationManager;
private String provider;
int i = 1;
private ProgressDialog pDialog;
String name;
// URL to get contacts JSON
private static String url = "Mylink";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
Intent i = getIntent();
String cityname = i.getExtras().getString("cityname");
TextView city = (TextView) findViewById(R.id.ort);
city.setText(cityname);
pDialog = new ProgressDialog(Locations.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
arrayList = new ArrayList<>();
lv = (ListView) findViewById(R.id.lv);
lv.setOnItemClickListener((AdapterView.OnItemClickListener) this);
runOnUiThread(new Runnable() {
#Override
public void run() {
new ReadJSON().execute(url);
}
});
final ImageButton filteropen = (ImageButton) findViewById(R.id.aufklaupen);
filteropen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RelativeLayout filter = (RelativeLayout) findViewById(R.id.filterloc);
filter.setVisibility(View.VISIBLE);
ImageButton filterclose = (ImageButton) findViewById(R.id.zuklappen);
filterclose.setVisibility(View.VISIBLE);
filteropen.setVisibility(View.INVISIBLE);
}
});
final ImageButton filterclose = (ImageButton) findViewById(R.id.zuklappen);
filterclose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RelativeLayout filter = (RelativeLayout) findViewById(R.id.filterloc);
filter.setVisibility(View.INVISIBLE);
ImageButton filteropen = (ImageButton) findViewById(R.id.aufklaupen);
filteropen.setVisibility(View.VISIBLE);
filterclose.setVisibility(View.INVISIBLE);
}
});
}
class ReadJSON extends AsyncTask<String,Integer,String> {
#Override
protected String doInBackground(String... params) {
return readURL(params[0]);
}
#Override
protected void onPostExecute(String content) {
try{
JSONObject jo = new JSONObject(content);
JSONArray ja = jo.getJSONArray("contacts");
for(int i=0;i<ja.length();i++){
JSONObject po = ja.getJSONObject(i);
arrayList.add(new productforloc(
po.getString("imageurl"),
po.getString("name"),
po.getString("street"),
po.getString("postalcode"),
po.getString("musicstyle"),
po.getString("musicsecond"),
po.getString("entry"),
po.getString("opening"),
po.getString("agegroup"),
po.getString("urlbtn"),
po.getString("Fsk"),
po.getString("city"),
po.getString("bg")
));
}
} catch (JSONException e) {
e.printStackTrace();
}
final CustomListAdapterforloc adapter = new CustomListAdapterforloc(getApplicationContext(),R.layout.model,arrayList);
lv.setAdapter(adapter);
if(pDialog.isShowing()){
pDialog.dismiss();
}
}
}
private String readURL(String url){
StringBuilder content = new StringBuilder();
try{
URL uri = new URL(url);
URLConnection urlConnection = uri.openConnection();
BufferedReader bufferedReader= new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String line;
while((line = bufferedReader.readLine()) !=null){
content.append(line+"\n");
}
bufferedReader.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return content.toString();
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
productforloc pForloc = arrayList.get(position);
Intent intent = new Intent();
intent.setClass(this,DetailActivity.class);
intent.putExtra("name",pForloc.getName());
intent.putExtra("imageurl",pForloc.getImage());
intent.putExtra("street",pForloc.getStreet());
intent.putExtra("postalcode",pForloc.getPostalcode());
intent.putExtra("entry",pForloc.getEntry());
intent.putExtra("agegroup",pForloc.getAgegroup());
intent.putExtra("opening",pForloc.getOpening());
intent.putExtra("urlbtn",pForloc.getUrlbtn());
intent.putExtra("Fsk",pForloc.getFsk());
intent.putExtra("city",pForloc.getCity());
intent.putExtra("musicstyle",pForloc.getMusicstyle());
intent.putExtra("musicsecond",pForloc.getMusicsecond());
intent.putExtra("bg",pForloc.getBg());
startActivity(intent);
}
/**
* Async task class to get json by making HTTP call
}
*/
}
and here is my Customlistadapter Activity:
public class CustomListAdapterforloc extends ArrayAdapter<productforloc>{
ArrayList<productforloc> products;
Context context;
int resource;
public CustomListAdapterforloc(Context context, int resource, List<productforloc> products) {
super(context, resource, products);
this.products = (ArrayList<productforloc>) products;
this.context = context;
this.resource = resource;
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView== null){
LayoutInflater layoutInflater = (LayoutInflater) getContext().getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.model,null,true);
}
productforloc product = getItem(position);
ImageView imageView = (ImageView) convertView.findViewById(R.id.imagelist);
Picasso.with(context).load(product.getImage()).into(imageView);
TextView txtName= (TextView) convertView.findViewById(R.id.namelist);
txtName.setText(product.getName());
return convertView;
}
}

i solved it using this code in my MAinActivity:
public class Locations extends AppCompatActivity {
private String TAG = Locations.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://partypeople.bplaced.net/loli.php";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.lv);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(Locations.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONArray contacts = new JSONArray(jsonStr);
// Getting JSON Array node
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
String name = c.getString("name");
String email = c.getString("email");
String address = c.getString("address");
String gender = c.getString("gender");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", name);
contact.put("email", email);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**3
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Locations.this, contactList,
R.layout.model, new String[]{"name", "email",
"mobile"}, new int[]{R.id.namelist,
});
lv.setAdapter(adapter);
}
}
and used in my CustomlistadapterActivity:
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
Thanks for your input

Override getCount method into adapter class.

Passing spinner values to async task as an parameter

I am new to android. I need to pass values from the spinner to asynctask as an parameter and till now I am successful in showing the results in spinner successfully. Now i need to pass the selected value from the spinner to another activity on a button click (as an parameter to asynctask). Below is the code. Thanks in advance.
BackgroundFetchWorker.java:
public class BackgroundFetchWorker extends AsyncTask<String,Void,String> {
String json_string;
ProgressDialog progressDialog;
Context context;
BackgroundFetchWorker(Context ctx)
{
context = ctx;
}
#Override
protected String doInBackground(String... params) {
String type2 = params[0];
String student_fetch_url = "http://pseudoattendance.pe.hu/studentFetch.php";
if (type2.equals("fetchSubject")) {
try {
String semester = params[1];
String stream = params[2];
URL url = new URL(student_fetch_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("semester", "UTF-8") + "=" + URLEncoder.encode(semester, "UTF-8")
+ URLEncoder.encode("stream","UTF-8")+"="+URLEncoder.encode(stream,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = " ";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPreExecute() {
progressDialog = new ProgressDialog(context);
progressDialog.setTitle("Fetching Data....");
progressDialog.setMessage("This may take a while..");
progressDialog.show();
}
#Override
protected void onPostExecute(String result) {
progressDialog.dismiss();
String s = result.trim();
if(s.equals("{\"result\":[]}")){
Toast.makeText(context, "ERROR OCCURED", Toast.LENGTH_SHORT).show();
}
else {
json_string = result;
Intent i = new Intent(context, TakeAttendanceActivity.class);
i.putExtra("studentdata", json_string);
context.startActivity(i);
Toast.makeText(context, "Success", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
FacultyWelcomeActivity.java:
public class FacultyWelcomeActivity extends AppCompatActivity implements Spinner.OnItemSelectedListener{
String JSON_STRING;
JSONObject jsonObject;
JSONArray jsonArray;
ContactAdapter contactAdapter;
ListView listView;
//Declaring an Spinner
private Spinner spinner;
private Spinner spinner1;
//An ArrayList for Spinner Items
private ArrayList<String> students;
private ArrayList<String> stream;
//JSON Array
private JSONArray result;
private JSONArray result1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_faculty_welcome);
//Initializing the ArrayList
students = new ArrayList<String>();
stream = new ArrayList<String>();
//Initializing Spinner
spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String semesters= parent.getItemAtPosition(position).toString();
String stream= parent.getItemAtPosition(position).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spinner1 = (Spinner) findViewById(R.id.spinner1);
//Adding an Item Selected Listener to our Spinner
//As we have implemented the class Spinner.OnItemSelectedListener to this class iteself we are passing this to setOnItemSelectedListener
getData();
getData1();
listView = (ListView) findViewById(R.id.lectureList);
contactAdapter = new ContactAdapter(this, R.layout.rowlayout);
listView.setAdapter(contactAdapter);
JSON_STRING = getIntent().getExtras().getString("JSON Data");
try {
jsonObject = new JSONObject(JSON_STRING);
jsonArray = jsonObject.getJSONArray("result");
int count = 0;
String sub1, sub2, sub3, sub4;
while (count < jsonArray.length()) {
JSONObject JO = jsonArray.getJSONObject(count);
sub1 = JO.getString("fname");
sub2 = JO.getString("lname");
sub3 = JO.getString("id");
sub4 = JO.getString("email");
Contacts contacts = new Contacts(sub1, sub2, sub3, sub4);
contactAdapter.add(contacts);
count++;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
public void fetchSubject(View view) {
String type2 = "fetchSubject";
String spinnerdata = spinner.getSelectedItem().toString();
String spinner1data = spinner1.getSelectedItem().toString();
BackgroundFetchWorker background = new BackgroundFetchWorker(this);
background.execute(type2,spinnerdata,spinner1data);
}
private void getData1(){
StringRequest stringRequest = new StringRequest(Config2.DATA_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result1 = j.getJSONArray(Config2.JSON_ARRAY);
getStudents1(result1);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void getData(){
StringRequest stringRequest = new StringRequest(Config.DATA_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
result = j.getJSONArray(Config.JSON_ARRAY);
getStudents(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void getStudents(JSONArray j){
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
students.add(json.getString(Config.TAG_SEMESTER));
} catch (JSONException e) {
e.printStackTrace();
}
}
spinner.setAdapter(new ArrayAdapter<String>(FacultyWelcomeActivity.this, android.R.layout.simple_spinner_dropdown_item, students));
}
private void getStudents1(JSONArray j){
//Traversing through all the items in the json array
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
stream.add(json.getString(Config2.TAG_STREAM));
} catch (JSONException e) {
e.printStackTrace();
}
}
spinner1.setAdapter(new ArrayAdapter<String>(FacultyWelcomeActivity.this, android.R.layout.simple_spinner_dropdown_item, stream));
}
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//check which spinner triggered the listener
}
#Override
public void onNothingSelected(AdapterView<?> parent) {}}

You are passing parameters to doInBackground() this way:
background.execute("your string");
Now the string "your string" will be the parameter within doInBackground() callback:
#Override
protected String doInBackground(String... params) {
String type2 = params[0]; // type2 == "your string"
...
}
See docs for more info.

how to set content in spinner dynamicly using async task?

I am new in android. I am trying to fetch data in spinner from database. But I don't know why my list is not set in spinner.
My code is
public class AddBasicDetail extends Fragment implements AdapterView.OnItemSelectedListener {
// array list for spinner adapter
private ArrayList<State> categoriesList;
ProgressDialog pDialog;
Spinner sp_state;
// API urls
// Url to create new category
private String URL_NEW_CATEGORY = "http://mandirdekhoo.com/app/md_eng/state.php";
public AddBasicDetail() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.add_basic_detail, container, false);
sp_state = (Spinner) v.findViewById(R.id.sp_state);
categoriesList = new ArrayList<State>();
// spinner item select listener
//sp_state.setOnItemSelectedListener((AdapterView.OnItemSelectedListener) getActivity());
new GetCategories().execute();
return v;
}
/**
* Adding spinner data
* */
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
//txtCategory.setText("");
for (int i = 0; i < categoriesList.size(); i++) {
lables.add(categoriesList.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(),
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
sp_state.setAdapter(spinnerAdapter);
}
/**
* Async task to get all food categories
* */
private class GetCategories extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Fetching food categories..");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_NEW_CATEGORY, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
Log.e("my response: ", "> " + jsonObj);
if (jsonObj != null) {
JSONArray categories = jsonObj .getJSONArray("result");
for (int i = 0; i < categories.length(); i++) {
JSONObject catObj = (JSONObject) categories.get(i);
State cat = new State(catObj.getInt("id"),
catObj.getString("state_name"));
categoriesList.add(cat);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
//populateSpinner();
}
}
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(
getContext(),
parent.getItemAtPosition(position).toString() + " Selected" ,
Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
}
my service handler class is
public class ServiceHandler {
static InputStream is = null;
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
public ServiceHandler() {
}
/**
* Making service call
* #url - url to make request
* #method - http request method
* */
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
/**
* Making service call
* #url - url to make request
* #method - http request method
* #params - http request params
* */
public String makeServiceCall(String url, int method,
List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
response = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error: " + e.toString());
}
return response;
}
}
and
public class State {
private int id;
private String name;
public State(){}
public State(int id, String name){
this.id = id;
this.name = name;
}
public void setId(int id){
this.id = id;
}
public void setName(String name){
this.name = name;
}
public int getId(){
return this.id;
}
public String getName(){
return this.name;
}
}
Please help

Hey after getting the correct response try to add this code
for e.g i am trying hardcoded values.replace this with your json.
final List<String> yourlist=new ArrayList<String>();
yourlist.add("Item 1");
yourlist.add("Item 2");
yourlist.add("Item 3");
yourlist.add("Item 4");
yourlist.add("Item 5");
final Spinner sp1= (Spinner) findViewById(R.id.spinner1);
final Spinner sp2= (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> adp1=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,yourlist);
adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp1.setAdapter(adp1);
Hope this helps.:)

Change your method like this
private void populateSpinner(List<String> categoriesList) {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < categoriesList.size(); i++) {
lables.add(categoriesList.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(),
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
sp_state.setAdapter(spinnerAdapter);
}
And after calling this method notifydatasetchanged() call this method.
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateSpinner(categoriesList);
}
Hope this will help you

what should be the correct answer for this exception? "Android.os.NetworkOnMainThreadException"

what is the correct way of fixing this problem?
This is my activity code
public class MainActivity extends Activity {
JSONParser jsonParser = new JSONParser();
ItemsAdapter adapter;
ListView list;
ListView list2;
HashMap<String, String> map;
ProgressDialog myPd_bar;
static String img_url;
private String strJson1 = "";
private String url = "http://www.*************************************************";
String img_test_url = "http://*************************************************";
ImageView imageView;
String bName;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.listView1);
list2 = (ListView) findViewById(R.id.listView2);
accessWebService();
}
// Async Task to access the web
private class LoadData extends AsyncTask<String, Void, String> {
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
myPd_bar = new ProgressDialog(MainActivity.this);
myPd_bar.setMessage("Loading....");
myPd_bar.setTitle(null);
myPd_bar.show();
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
strJson1 = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
#Override
protected void onPostExecute(String result) {
getImageData();
myPd_bar.dismiss();
}
}// end async task
public void accessWebService() {
LoadData task = new LoadData();
// passes values for the urls string array
task.execute(new String[] { url });
}
// build hash set for list view
public void getImageData() {
map = new HashMap<String, String>();
ArrayList<Pair<String,String>> listData = new ArrayList<Pair<String,String>>();
try {
JSONObject jsonResponse = new JSONObject(strJson1);
JSONArray jsonMainNode = jsonResponse.optJSONArray("bank");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
img_url = jsonChildNode.optString("logo");
String test1 = img_test_url + img_url;
bName = jsonChildNode.optString("id");
//map.put(bName, test1);
listData.add(new Pair<String,String>(bName,test1 ));
}
ItemsAdapter adapter = new ItemsAdapter(getApplicationContext(),listData);
list.setAdapter(adapter);
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Connection Error...",
Toast.LENGTH_LONG).show();
}
list.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
#SuppressWarnings("unchecked")
Pair<String, String> item = (Pair<String, String>)arg0.getItemAtPosition(arg2);
String id = item.first;
Log.d("Bank Name", id);
List<String> cards_name = new ArrayList<String>();
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("Bank_Name", id));
Log.d("request!", "starting");
JSONObject jsonResponse = jsonParser.makeHttpRequest("http://*************************************************", "POST", params);
Log.d("Credite Cards", jsonResponse.toString());
JSONArray jsonMainNode = jsonResponse.optJSONArray("creditcards");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String card = jsonChildNode.optString("name");
Log.d("Card_name", card);
cards_name.add(card);
}
ArrayAdapter adapter2 = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, cards_name);
list2.setAdapter(adapter2);
} catch (JSONException e) {
Toast.makeText(getApplicationContext(), "Error..." + e.toString(),
Toast.LENGTH_LONG).show();
}
}
});
}
}

I guess this where you go wrong
JSONObject jsonResponse = jsonParser.makeHttpRequest("http://*************************************************", "POST", params);
In onPostExecute you have
getImageData();
In getImageData() you have listview item click listener
list.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
..// rest of the code
JSONObject jsonResponse = jsonParser.makeHttpRequest("http://*************************************************", "POST", params);
// network operation on main thread
This getting json object must be doen in a background thread
Also you cannot update ui from background thread
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
Must be removed

JSONObject jsonResponse = jsonParser.makeHttpRequest("http://*************************************************", "POST", params);
//this should be in a separate non ui thread

For the http request in android the better way to use the following library which is manage all the auto setting for the request there are simple few line code
Check the following link.
http://loopj.com/android-async-http/
download the jar file and paste in the lib folder and then just write few lines like for simple get methods
});
import com.loopj.android.http.*;
AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.google.com", new AsyncHttpResponseHandler() {
#Override
public void onSuccess(String response) {
System.out.println(response);
}
});

Show data in listview with Asynctask

I success show my data from web service JSON in listview, but I want to add Asyntask.
Where I can put code Asyntask in my code.
This my code to show data in list view
public class Jadwal_remix extends ListActivity {
String v_date;
JSONArray r_js = null;
ArrayList<HashMap<String, String>> myArray = new ArrayList<HashMap<String,String>>();
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
String status ="";
String date = "";
String result = "";
String url = "http://10.0.2.2/remix/view_list.php";
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(url);
try
{
r_js = json.getJSONArray("view_list");
for (int i =0; i < r_js.length(); i++)
{
String my_array = "";
JSONObject ar = r_js.getJSONObject(i);
status = ar.getString("st");
date = ar.getString("date");
result = ar.getString("result");
if (status.trim().equals("er"))
{
my_array += "Sorry "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
else
{
my_array += "Date : "+date+" "+"Result : "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
adapter_listview();
}
public void adapter_listview() {
ListAdapter adapter = new SimpleAdapter(this, jadwalRemix,R.layout.my_list,new String[] { "result"}, new int[] {R.id.txtResult});
setListAdapter(adapter);
}
}
And this JSONParser
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject AmbilJson(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
Where can I put code for Asyntask?
Ok, I get sample code, and my code now like this
public class Jadwal_remix extends ListActivity {
String v_date;
JSONArray r_js = null;
ArrayList<HashMap<String, String>> myArray = new ArrayList<HashMap<String,String>>();
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
private class myProses extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
protected void onPreExecute() {
dialog = ProgressDialog.show(Jadwal_remix.this, "", "Loading... Please wait", true);
}
protected Void doInBackground(Void... params) {
String status ="";
String date = "";
String result = "";
String url = "http://10.0.2.2/remix/view_list.php";
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(url);
try
{
r_js = json.getJSONArray("view_list");
for (int i =0; i < r_js.length(); i++)
{
String my_array = "";
JSONObject ar = r_js.getJSONObject(i);
status = ar.getString("st");
date = ar.getString("date");
result = ar.getString("result");
if (status.trim().equals("er"))
{
my_array += "Sorry "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
else
{
my_array += "Date : "+date+" "+"Result : "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
return null;
protected void onPostExecute(Void unused) {
adapter_listview();
dialog.dismiss();
}
}
public void adapter_listview() {
ListAdapter adapter = new SimpleAdapter(this, jadwalRemix,R.layout.my_list,new String[] { "result"}, new int[] {R.id.txtResult});
setListAdapter(adapter);
}
}
I'm get problem when server is die, it still loading.
How I can show message ex: can't connect to server?

Working ASyncTask tutorial,
Full ASyncTask Eclipse Project,
and here's some code that I think, when mixed with the above sample, will get you the result with the list that you desire (you'll have to adapt it to your needs a bit, though (pay attention to the list stuff, even though this is from a custom Dialog:
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Kies Facebook-account");
builder.setNegativeButton("Cancel", this);
LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View dialogLayout = inflater.inflate(R.layout.dialog, null);
builder.setView(dialogLayout);
final String[] items = {"Red", "Green", "Blue" };
builder.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.v("touched: ", items[which].toString());
}}
);
return builder.create();
}

This is my code please try this one,
MAinActivity.java
public class MyActivity extends Activity {
private ListView contests_listView;
private ProgressBar pgb;
ActivitiesBean bean;
ArrayList<Object> listActivities;
ActivityAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
contests_listView = (ListView) findViewById(R.id.activity_listView);
pgb = (ProgressBar) findViewById(R.id.contests_progressBar);
listActivities = new ArrayList<Object>();
new FetchActivitesTask().execute();
}
public class FetchActivitesTask extends AsyncTask<Void, Void, Void> {
int i =0;
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pgb.setVisibility(View.VISIBLE);
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
String url = "Your URL Here";
String strResponse = util.makeWebCall(url);
try {
JSONObject objResponse = new JSONObject(strResponse);
JSONArray jsonnodes = objResponse.getJSONArray(nodes);
for (i = 0; i < jsonnodes.length(); i++)
{
String str = Integer.toString(i);
Log.i("Value of i",str);
JSONObject jsonnode = jsonnodes.getJSONObject(i);
JSONObject jsonnodevalue = jsonnode.getJSONObject(node);
bean = new ActivitiesBean();
bean.title = jsonnodevalue.getString(title);
bean.image = jsonnodevalue.getString(field_activity_image_fid);
listActivities.add(bean);
}
}
catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
public void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pgb.setVisibility(View.GONE);
displayAdapter();
}
}
public void displayAdapter()
{
adapter = new ActivityAdapter(this, listActivities);
contests_listView.setAdapter(adapter);
contests_listView.setOnItemClickListener(new OnItemClickListener() {
//#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long id) {
// your onclick Activity
}
});
}
}
util.class
public static String makeWebCall(String url) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpRequest = new HttpGet(url);
// HttpPost post = new HttpPost(url);
try {
HttpResponse httpResponse = client.execute(httpRequest);
final int statusCode = httpResponse.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
return null;
}
HttpEntity entity = httpResponse.getEntity();
InputStream instream = null;
if (entity != null) {
instream = entity.getContent();
}
return iStream_to_String(instream);
}
catch (IOException e) {
httpRequest.abort();
// Log.w(getClass().getSimpleName(), "Error for URL =>" + url, e);
}
return null;
}
public static String iStream_to_String(InputStream is1) {
BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096);
String line;
StringBuilder sb = new StringBuilder();
try {
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String contentOfMyInputStream = sb.toString();
return contentOfMyInputStream;
}
}
ActivityBean.java
public class ActivitiesBean implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
public String title;
public String image;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}