Develop Reference

How to synchronize android spinner of two different activity

I have two activity.Both activity loaded the same data in the spinner from server.and both activity populate properly.I'm not getting proper idea that change in one spinner item position also display the same spinner's item when switch to other activity.How to synchronize both spinners of two different activities.
private class BackTask extends AsyncTask<Void,Void,Void> {
ArrayList<String> list;
protected void onPreExecute(){
super.onPreExecute();
list=new ArrayList<>();
}
protected Void doInBackground(Void...params){
InputStream is=null;
String result="";
try{
HttpClient httpclient=new DefaultHttpClient();
HttpPost httppost= new HttpPost("http://my_url/Service.asmx/GetServiceList");
HttpResponse response=httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
}catch(IOException e){
e.printStackTrace();
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));
String line = null;
while ((line = reader.readLine()) != null) {
result+=line;
}
is.close();
//result=sb.toString();
}catch(Exception e){
e.printStackTrace();
}
// parse json data
try{
JSONArray jArray =new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject jsonObject=jArray.getJSONObject(i);
// add interviewee name to arraylist
list.add(jsonObject.getString("ServiceName"));
}
}
catch(JSONException e){
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Void result){
listItems.addAll(list);
adapter.notifyDataSetChanged();
}
}

public class StaticResources
{
private List<String> sDataSource = new ArrayList<String>();
public List<String> getDataSource() {...}
public void setDataSource(..) {...}
}
In both activities, refer to StaicResources.getDataSource(), that is it.

Try with this way
public static ArrayList listid,listdata;
onPostExecute(){
try{
JSONArray jarrvideos=new JSONArray(responcedata);
for(int i=0;i<jarrvideos.length();i++){
JSONObject jobj = jarrvideos.getJSONObject(i);
listid.add(jobj.getString("id"));
listdata.add(jobj.getString("id"));
}
BindSpinnerData();
}catch(Exception e){
e.printStackTrace();
}
}
private void BindSpinnerData() {
ArrayAdapter<String> spinnerLocation = new
ArrayAdapter<String(MedicalSurgical.this, R.layout.spinneritem, listdata);
spinnerLocation.setDropDownViewResource(R.layout.spinnerpopupblack);
spnDatasecond.setAdapter(spinnerLocation);
}
now it will display your first activity dpinner data if you need another activity same spinner data then you need to access listid,listdata array list in another class
for Accessing classname.listid or classname.listdata

App crashed when JSONObject get called

I wanted to retrieve the data from MySQL to android listView. I have follow each single steps from this tutorial, however it crashed when I trying to call JSON object. Please help. Thanks a lot..
private ListView listView;
String myJSON;
JSONArray information = null;
ArrayList<HashMap<String, String>> infoList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
infoList = new ArrayList<HashMap<String, String>>();
listView = (ListView) findViewById(R.id.listView2);
getData();
}
public void getData() {
class GetDataJSON extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://192.168.107.115:80/Android/CRUD/retrieveInformation.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
// Oops
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
#Override
protected void onPostExecute(String result){
myJSON=result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
information = jsonObj.getJSONArray(Config.TAG_RESULTS);
for(int i=0;i<information.length();i++){
JSONObject c = information.getJSONObject(i);
String date = c.getString(Config.TAG_DATE);
Toast.makeText(getApplicationContext(),date,Toast.LENGTH_LONG).show();
String timeIn = c.getString(Config.TAG_TiME_IN);
Toast.makeText(getApplicationContext(),timeIn,Toast.LENGTH_LONG).show();
String timeOut = c.getString(Config.TAG_TIME_OUT);
HashMap<String,String> info = new HashMap<String,String>();
info.put(Config.TAG_DATE, date);
info.put(Config.TAG_TiME_IN, timeIn);
info.put(Config.TAG_TIME_OUT,timeOut);
infoList.add(info);
}
ListAdapter adapter = new SimpleAdapter(
HomePage.this, infoList, R.layout.retrieve_data,
new String[]{Config.TAG_DATE,Config.TAG_TiME_IN,Config.TAG_TIME_OUT},
new int[]{R.id.date,R.id.timeIn,R.id.timeOut}
);
listView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
retrieveInformation.php
<?php
define('HOST','127.0.0.1:3307');
define('USER','root');
define('PASS','');
define('DB','androiddb');
$con = mysqli_connect(HOST,USER,PASS,DB) or die('unable to connect');
$sql = "select * from information";
$res = mysqli_query($con,$sql);
$result=array();
while($row=mysqli_fetch_array($res)){
array_push($result,array('id'=>$row[0],'name'=>$row[1],'weather'=>$row[2],'date'=>$row[3],'status'=>$row[4],
'time_in'=>$row[5], 'time_out'=>$row[6]));
}
print(json_encode(array("result"=>$result)));
mysqli_close($con);
?>
LogCat
Process: com.example.project.myapplication, PID: 31622
java.lang.NullPointerException
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONObject.<init>(JSONObject.java:155)
at org.json.JSONObject.<init>(JSONObject.java:172)
at com.example.project.myapplication.GUI.HomePage.showList(HomePage.java:185)
at com.example.project.myapplication.GUI.HomePage$1GetDataJSON.onPostExecute(HomePage.java:176)
at com.example.project.myapplication.GUI.HomePage$1GetDataJSON.onPostExecute(HomePage.java:137)
at android.os.AsyncTask.finish(AsyncTask.java:632)
Code
`JSONObject jsonObj = new JSONObject(myJSON);` ,
class GetDataJSON extends AsyncTask<String, Void, String> {
and showList();.

Make a stupid mistake again. forget to switch on the wifi-connection

Android ListView duplicates data after pressing back button

I have a listview populated by the data from mysql database. It works fine but when I select an item then press back , the previous listview fecth again data from database that duplicates the items in my listview.
Here's is my code :
public class CityPage extends Activity{
Activity context;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
ProgressDialog pd;
CityAdapter cityAdapter;
ListView listCity;
ArrayList<City> records;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_city_page);
context = this;
records = new ArrayList<City>();
listCity = (ListView) findViewById(R.id.cities);
cityAdapter = new CityAdapter(context, R.layout.city_layout, R.id.city_name, records);
listCity.setAdapter(cityAdapter);
listCity.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent myIntent = new Intent(view.getContext(),City_attractions.class);
Toast.makeText(CityPage.this, "Opening", Toast.LENGTH_LONG).show();
String info1 = records.get(position).getCityName();
String info2 = records.get(position).getDescription();
myIntent.putExtra("info1", info1);
myIntent.putExtra("info2", info2);
startActivity(myIntent);
}
});
}
#Override
protected void onStart() {
super.onStart();
fetchCity fetch = new fetchCity();
fetch.execute();
}
private class fetchCity extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
super.onPreExecute();
}
protected Void doInBackground(Void... params) {
InputStream is = null;
String result = "";
try {
httpclient = new DefaultHttpClient();
httppost = new HttpPost("http://iguideph-001-site1.btempurl.com/getcity.php");
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
} catch (Exception e) {
if (pd != null)
pd.dismiss(); //close the dialog if error occurs
Log.e("ERROR", e.getMessage());
}
//convert response to string
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();
result = sb.toString();
} catch (Exception e) {
Log.e("ERROR", "Error converting result " + e.toString());
}
//parse json data
try {
// Remove unexpected characters that might be added to beginning of the string
result = result.substring(result.indexOf(""));
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
City p = new City();
p.setCityName(json_data.getString("place_name"));
p.setDescription(json_data.getString("description"));
records.add(p);
}
} catch (Exception e) {
Log.e("ERROR", "Error pasting data " + e.toString());
}
return null;
}
protected void onPostExecute(Void result) {
if (pd != null) pd.dismiss(); //close dialog
Log.e("size", records.size() + "");
cityAdapter.notifyDataSetChanged(); //notify the ListView to get new records
}
}
}

try remove those lines from onstart() and put them inside oncreate() function
fetchCity fetch = new fetchCity();
fetch.execute();
Good luck !

NetworkOnMainThread Exception - parsing data the right way

iam developing an android app for parsing a json data set into my app. But everytime iam getting a NetworkOnMainThred exception:
android.os.NetworkOnMainThreadException
On this line:
HttpResponse response = httpclient.execute(httppost);
After that ive tried fixing it by puttin the progress in an AsyncTask Inner Class. But that has no effect iam getting the same error. Is the AsyncTask really essential?
Here the whole context:
question.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Connector db = new Connector();
db.executeAction();//calls AsyncTask
}
});
public class Connector extends Activity {
View rootView;
ArrayList<String> resultset = new ArrayList<String>();
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void executeAction() {
new LongOperation().execute();
}
private class LongOperation extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... params) {
testDB2();
return null;
}
public void testDB2() {
String result = "";
//the year data to send
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("year", "1980"));
//http post
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://quizmaster.esy.es/db_con.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
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();
result = sb.toString();
} catch (Exception e) {
//(TextView)rootView.findViewById(R.id.question)
Log.e("log_tag", "Error converting result " + e.toString());
}
ArrayList<String> resultset = new ArrayList<String>();
//parse json data
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
resultset.add(String.format(json_data.getString("Frage")));
Log.i("log_tag", "id: " + json_data.getInt("ID") +
", Frage: " + json_data.getString("Frage")
);
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data " + e.toString());
}
}
#Override
protected void onPostExecute(String result) {
}
#Override
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... values) {
}
}
}
Invocation:
public class Connector extends Activity {
View rootView;
ArrayList<String> resultset = new ArrayList<String>();
/** Called when the activity is first created. */
#Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void executeAction() {
new LongOperation().doInBackground();
}

Your onPostExecute() contains a call to testDB2(). onPostExecute() is executed on the main thread. Thus the exception.
Further, you never call doInBackground() directly. Instead, you would invoke the AsyncTask as:
new LongOperation().execute();

in AsyncTask i want the data in list view

hi friends i just want the data show in a list view i using async task and i complete get the data in json and filtering it by id and title now i show id and title in a listview can you help me thanks in advance
public class runActivity extends Activity implements OnClickListener {
String returnString="";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViewById(R.id.my_button).setOnClickListener(this);
}
#Override
public void onClick(View arg0) {
Button b = (Button)findViewById(R.id.my_button);
b.setClickable(false);
new LongRunningGetIO().execute();
}
private class LongRunningGetIO extends AsyncTask <Void, Void, String> {
protected String getASCIIContentFromEntity(HttpEntity entity) throws IllegalStateException, IOException {
InputStream in = entity.getContent();
StringBuffer out = new StringBuffer();
int n = 1;
while (n>0) {
byte[] b = new byte[4096];
n = in.read(b);
if (n>0) out.append(new String(b, 0, n));
}
return out.toString();
}
#Override
protected String doInBackground(Void... params) {
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpGet httpGet = new HttpGet("http://192.168.1.156/recess/document/document.json");
HttpClient client = new DefaultHttpClient();
HttpResponse response=null;
try{
response = client.execute(httpGet);}
catch(Exception e){}
System.out.println(response.getStatusLine());
String text = null;
try {
response = httpClient.execute(httpGet, localContext);
HttpEntity entity = response.getEntity();
text = getASCIIContentFromEntity(entity);
} catch (Exception e) {
return e.getLocalizedMessage();
}
String var =text;
try{
JSONObject jObj = new JSONObject(var);
JSONArray jArray = jObj.getJSONArray("document");
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getString("id")+
", title: "+json_data.getString("title")
);
returnString += "\n" +"id:"+ json_data.getString("id")+" "+"Title:"+ json_data.getString("title");
}
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return returnString;
}
protected void onPostExecute(String results) {
if (results!=null) {
ListView listView = (ListView) findViewById(R.id.mylist);
listView.setFilterText(results);
}
Button b = (Button)findViewById(R.id.my_button);
b.setClickable(true);
}
}
}

You will need to build an Array to use with ListAdapter.
Here is a guide from Google: http://developer.android.com/resources/tutorials/views/hello-listview.html

I think the best solution would be to create a Handler in your activity. You can then send a message to the handler and get the data and put it in the ListView.

In doInBackground "for" loop just either create the array of your data or put data in Array list of object (then need to write custom adapter)
for
1- option
http://www.java-samples.com/showtutorial.php?tutorialid=1516
http://www.ezzylearning.com/tutorial.aspx?tid=1659127&q=binding-android-listview-with-string-array-using-arrayadapter
For
2- option
http://www.ezzylearning.com/tutorial.aspx?tid=1763429&q=customizing-android-listview-items-with-custom-arrayadapter