Develop Reference

Get listview data while checked and pass it to another activity

Ive been searching for the right answer but nothing can solve my problems. I have a list view which is populated by my database from webserver. So basically what need is to get the data from the listview that is checked by user and pass the data to another activity. Sorry for my bad english hope you guys can help me.
Error ive received
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
at java.util.ArrayList.get(ArrayList.java:304)
at firin.myuploads.Attendance$1.onClick(Attendance.java:74)
Attendance.java
public class Attendance extends AppCompatActivity {
//For Checkbox
ArrayList<String> selectedItems=new ArrayList<>();
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
private CheckBox cb;
private Button bGet;
//private id[] id;
private static String url = "www.myphpurl.com";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_attendance);
contactList = new ArrayList<>();
bGet = (Button) findViewById(R.id.button7);
lv = (ListView) findViewById(R.id.list);
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
new GetContacts().execute();
bGet.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// String selected =((TextView)view.findViewById(R.id.mobile)).getText().toString();
CheckBox cb = (CheckBox) findViewById(R.id.cb);
cb.setChecked(true);
int len = lv.getCount();
SparseBooleanArray checked = lv.getCheckedItemPositions();
for (int i = 0; i < len; i++)
if (checked.get(i)) {
String item = selectedItems.get(i);
Toast.makeText(getApplicationContext(), item, Toast.LENGTH_LONG).show();
/*some code to save data in MainActivity*/
Intent in = new Intent(Attendance.this, SendMail.class);
in.putExtra("ListValue", item);
startActivity(in);}
}
});
}
This is the code where i populate my data to the listview
public class GetContacts extends AsyncTask<Void, Void, Void> {
#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 {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray result = jsonObj.getJSONArray("result");
// looping through All Contacts
for (int i = 0; i < result.length(); i++) {
JSONObject c = result.getJSONObject(i);
String id = c.getString("userID");
String studentName = c.getString("studentName");
String parentName = c.getString("parentName");
String parentEmail = c.getString("parentEmail");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("UID", id);
contact.put("sName", studentName);
contact.put("pName", parentName);
contact.put("pEmail", parentEmail);
// 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 onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(Attendance.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
public void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Attendance.this, contactList,
R.layout.list_item, new String[]{"sName", "pName",
"pEmail"}, new int[]{R.id.name,
R.id.email, R.id.mobile});
lv.setAdapter(adapter);
}
}
Is this how i set my setOnClick?
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String selected =((TextView)findViewById(R.id.mobile)).getText().toString();
CheckBox cb = (CheckBox) findViewById(R.id.cb);
cb.setChecked(true);
}});
Hope you guys can help me. thanks in advance

First you need to get how many item is selected in the listview, then after store in another array and pass that array to another activity.
Set you listview selection mode as Multi Choice.
listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
Set Listener on listview as below
ArrayList<String> selectedItem = new ArrayList();
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true);
adapter.getView(position, view, parent).setBackgroundColor(getResources().getColor(R.color.btn_login));
adapter.notifyDataSetChanged();
Log.i(TAG, "Selected Item is " + stateList.get(position));
selectedItem.add(yourArray.get(position))
}
});
you can invok your intent and pass selectedItem to that intent like this
Intent intent = new Intent(activity, YourActivity.class);
intent.putStringArrayListExtra("selected_list", selectedItem);
startActivity(intent);
and In your receiving intent you need to do:
ArrayList<String> selectedItem;
Intent i = getIntent();
selectedItem = i.getStringArrayListExtra("selected_list");

how to extract integer value on textview to another integer inside listview onclicklistener

I working on an Android project which has a ListView and contains one TextView to display the contact and contact are stored in my website in form of json.
json link for contacts
I am able to parse the contacts I have no problem with that. But the problem is the parsed data is displayed as a number like "776057619" in the TextView and I want this TextView number to be taken and stored in a separate variable. By doing this I can use it to prompt the user "weather you want to call that particular number"??. But I don't no how to pull that number from the TextView to a separate variable and use to call inside ListView's OnItemClickListener
below is my code
public class Contactmedia extends ListActivity {
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
private static final String READ_CONTACT_URL = "http://www.iamnotcrazy.hol.es/webservice/contact.php";
private static final String TAG_NUMBER ="number";
private static final String TAG_POSTS = "posts";
private JSONArray mid = null;
//manages all of our comments in a list.
private ArrayList<HashMap<String, String>> mContactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contactmedialist);
}
#Override
protected void onResume() {
super.onResume();
new LoadComments().execute();
}
/**
* Retrieves json data of comments
*/
public void updateJSONdata() {
mContactList = new ArrayList<HashMap<String, String>>();
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(READ_CONTACT_URL);
try {
mid= json.getJSONArray(TAG_POSTS);
for (int i = 0; i < mid.length(); i++) {
JSONObject c = mid.getJSONObject(i);
String number = c.getString(TAG_NUMBER);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_NUMBER, number);
mContactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into our listview
*/
private void updateList() {
ListAdapter adapter = new SimpleAdapter(this, mContactList,
R.layout.contactmediadesign, new String[] { TAG_NUMBER
}, new int[] { R.id.contactno
});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
/* this is where i have problem how to get that number without converting to string*/
TextView v = (TextView)view.findViewById(R.id.contactno);
int myNum = Integer.parseInt(v.getText().toString());
/* and here i want use that mynum after getiing phonenumber for calling purpouse ass shown below
* but its not working :(*/
if (position == 0){
Toast.makeText(getApplicationContext(), "yes you done it!!", Toast.LENGTH_SHORT).show();
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+"myNum"));
startActivity(callIntent);
}
}
});
}
public class LoadComments extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Contactmedia.this);
pDialog.setMessage("Loading complaints...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected Boolean doInBackground(Void... arg0) {
updateJSONdata();
return null;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
pDialog.dismiss();
updateList();
}
}
}

Since you actually need string, you don't have to convert to integer at all:
TextView v = (TextView)view.findViewById(R.id.contactno);
...
callIntent.setData(Uri.parse("tel:"+ v.getText().toString()));
or if you do need to store that number in variable for some reason, you should use String instead
TextView v = (TextView)view.findViewById(R.id.contactno);
string myNum = v.getText().toString();
...
callIntent.setData(Uri.parse("tel:" + myNum));

I would recommend getting the data associated with that position rather than trying to parse the view to get it.
You can get the data from the adapter with adapter.getItem(int pos). Just make adapter final or a member variable to access it in the OnItemClickListener.

First of all you should check your Manifest file, you should have this outside the "application" tag but within the "manifest" tag:
<uses-permission android:name="android.permission.CALL_PHONE" />
Try to do something like this in your code:
Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + v.getText().toString()));
startActivity(callIntent);
You should use String value instead of int

remove the double quotation on mynum. you can also use basic oop to save your integer value. fyi, myNum doesnt have to be an integer. it can be a string
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
/* this is where i have problem how to get that number without converting to string*/
TextView v = (TextView)view.findViewById(R.id.contactno);
int myNum = Integer.parseInt(v.getText().toString());
setNumber(myNum); //saving the myNum variable
System.out.println("number is: " + getNumber());//if you want to get the value of myNum, just call the getNumber()
if (position == 0){
Toast.makeText(getApplicationContext(), "yes you done it!!", Toast.LENGTH_SHORT).show();
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+ myNum));//remove the quotation for myNum
startActivity(callIntent);
}
}
private int number;
void setNumber(int number){
this.number=number;
}
int getNumber(){
return number;
}

Android parsed json data and add a search functionality

Sorry for my bad english.I am new to android and i parsed json data into listview,now i want to put on him a search functionality,but i have a problem,when i entered a words in edittext,then in the listview my items are duplicated,and items has been increases,look my code and screen shots.Thanks in advance and any help will be much appreciated.
My Artist Activity:
public class Artists extends Activity {
// Connection detector
ConnectionDetector cd;
// Alert dialog manager
AlertDialogManager alert = new AlertDialogManager();
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jsonParser = new JSONParser();
// This is not using now if you want you can remove its all references :)
ArrayList<HashMap<String, String>> albumsList;
ArrayList<AdapterDTOArtist> mAdapterDTOs = null;
private LazyAdapterArtist mLazyAdatper = null;
private ArrayList<String> array_sort = new ArrayList<String>();
int textlength = 0;
// albums JSONArray
JSONArray albums = null;
LinearLayout ll_artists_chart;
LinearLayout ll_artists_newrelease;
private EditText etSearch;
private static String URL_ALBUMS = "http://triplevmusic.com/dev/webservice/index.php?op=fetch_artists.json";
// JSON Node names
private static final String TAG_CONTACTS = "data";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private ListView lv = null;
EditText et_artists_searchWord;
// contacts JSONArray
JSONArray contacts = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.artists);
lv = (ListView) findViewById(R.id.artist_main_list_id);
cd = new ConnectionDetector(getApplicationContext());
// Check for internet connection
if (!cd.isConnectingToInternet()) {
// Internet Connection is not present
alert.showAlertDialog(Artists.this,
"Internet Connection Error",
"Please connect to working Internet connection", false);
// stop executing code by return
return;
}
// Hashmap for ListView
albumsList = new ArrayList<HashMap<String, String>>();
mAdapterDTOs = new ArrayList<AdapterDTOArtist>();
// Loading Albums JSON in Background Thread
new LoadAlbums().execute();
// get listview
/**
* Listview item click listener TrackListActivity will be lauched by
* passing album id
* */
lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int arg2,
long arg3) {
// on selecting a single album
}
});
ll_artists_chart = (LinearLayout) findViewById(R.id.ll_artists_chart);
ll_artists_newrelease = (LinearLayout) findViewById(R.id.ll_artists_newrelease);
et_artists_searchWord = (EditText) findViewById(R.id.et_artists_searchWord);
et_artists_searchWord.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
// ((Filterable) Artists.this.mAdapterDTOs).getFilter().filter(s);
List<AdapterDTOArtist> list = filter(s.toString(),mAdapterDTOs, true);
mAdapterDTOs.addAll(list);
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
ll_artists_chart.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(getBaseContext(), ChartActivity.class);
startActivity(intent);
// finish();
}
});
ll_artists_newrelease.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(getBaseContext(), NewReleases.class);
startActivity(intent);
//finish();
}
});
}
/**
* Background Async Task to Load all Albums by making http request
* */
class LoadAlbums extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Artists.this);
pDialog.setMessage("Listing Artists ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting Albums JSON
* */
protected String doInBackground(String... args) {
// Building Parameters
//List<NameValuePair> params = new ArrayList<NameValuePair>();
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(URL_ALBUMS);
// getting JSON string from URL
//String json = jsonParser.makeHttpRequest(URL_ALBUMS, "GET", params);
// Check your log cat for JSON reponse
Log.i("Albums JSON: ", "> " + json);
try {
//albums = new JSONArray(json);
albums = json.getJSONArray(TAG_CONTACTS);
if (albums != null) {
// looping through All albums
for (int i = 0; i < albums.length(); i++) {
JSONObject c = albums.getJSONObject(i);
// Storing each json item values in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
/*String EateryThmbnailUrl = c
.getString(TAG_THMBNAIL_URL);*/
// ~\/Uploads\/EateryImages\/\/7\/41283f1f-8e6f-42d4-b3c1-01f990efb428.gif
/*EateryThmbnailUrl = HOST_URL
+ EateryThmbnailUrl.replace("~", "");*/
AdapterDTOArtist adapterDTO = new AdapterDTOArtist();
adapterDTO.setmTag_Id(id);
adapterDTO.setmTag_Name(name);
// adapterDTO.setmImage_URL(EateryThmbnailUrl);
mAdapterDTOs.add(adapterDTO);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
HashMap<String, Integer> map1 = new HashMap<String, Integer>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
albumsList.add(map);
}
} else {
Log.d("Albums: ", "null");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all albums
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
// updating listview
mLazyAdatper = new LazyAdapterArtist(Artists.this,
mAdapterDTOs);
lv.setAdapter(mLazyAdatper);
// mLazyAdatper.setDataSet(mAdapterDTOs);
}
});
}
}
public static List<AdapterDTOArtist> filter(String string,
Iterable<AdapterDTOArtist> iterable, boolean byName) {
if (iterable == null)
return new LinkedList<AdapterDTOArtist>();
else {
List<AdapterDTOArtist> collected = new LinkedList<AdapterDTOArtist>();
Iterator<AdapterDTOArtist> iterator = iterable.iterator();
if (iterator == null)
return collected;
while (iterator.hasNext()) {
AdapterDTOArtist item = iterator.next();
collected.add(item);
}
return collected;
}
}
}
My AdapterDTOArtist class :
public class AdapterDTOArtist {
private String mTag_Id;
private String mTag_Name;
public String getmTag_Name() {
return mTag_Name;
}
public void setmTag_Name(String mTag_Name) {
this.mTag_Name = mTag_Name;
}
public String getmTag_Id() {
return mTag_Id;
}
public void setmTag_Id(String mTag_Id) {
this.mTag_Id = mTag_Id;
}
}
My LazyAdapterArtist class:
public class LazyAdapterArtist extends BaseAdapter {
private Context mContext = null;
private ArrayList<AdapterDTOArtist> mAdapterDTOs = null;
public LazyAdapterArtist(Context context,
ArrayList<AdapterDTOArtist> mAdapterDTOs2) {
// TODO Auto-generated constructor stub
this.mContext = context;
this.mAdapterDTOs = mAdapterDTOs2;
}
public void setDataSet(ArrayList<AdapterDTOArtist> adapterDTOs) {
this.mAdapterDTOs = adapterDTOs;
notifyDataSetChanged();
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mAdapterDTOs.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View row = convertView;
ViewHolder mHolder = new ViewHolder();
if (row == null) {
// Cell is inflating for first time
row = LayoutInflater.from(mContext)
.inflate(com.whizpool.triplevmusic.R.layout.row_artists,
null, false);
mHolder.mNameTxt = (TextView) row
.findViewById(com.whizpool.triplevmusic.R.id.tv_row_artists);
row.setTag(mHolder);
} else {
// recycling of cells
mHolder = (ViewHolder) row.getTag();
}
mHolder.mNameTxt.setText(mAdapterDTOs.get(position).getmTag_Name());
return row;
}
static class ViewHolder {
TextView mNameTxt = null;
}
}
when parsed json data into listview my app look like this:
when enter word in edittext field then my app look like this:
I just want,when i entered the word for example i enter "D" then in a listview only those words were display which have starting word is "D".Thanks Alot and again sorry for my english.

The problem is that when you filter the data you add again to mAdapterDTOs list the results you need to clear the list before adding the results. To avoid losing your data you have to keep them in a separate list and when user times nothing show them.
Step 1: Use a field for keeping a backup of your data (just as mAdapterDTOs):
ArrayList<AdapterDTOArtist> mAdapterDTOs = null;
ArrayList<AdapterDTOArtist> mAdapterDTOsBackup= null;
Step 2: initialize that field:
mAdapterDTOs = new ArrayList<AdapterDTOArtist>();
mAdapterDTOsBackup = new ArrayList<AdapterDTOArtist>();
Step 3: Fill in all your data to the backup set just after parsing:
/**
* getting Albums JSON
* */
protected String doInBackground(String... args) {
// HERE all your code as it is!!!
// Just before return add a set keeping the backup of your data...
// initialize the set just as mAdapterDTOs
mAdapterDTOsBackup.addAll(mAdapterDTOs);
return null;
}
Step 4: When searching filter data from backup set and then add them on the mAdapterDTOs do not forget to clear it before.
et_artists_searchWord.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
// ((Filterable) Artists.this.mAdapterDTOs).getFilter().filter(s);
List<AdapterDTOArtist> list = filter(s.toString(),mAdapterDTOsBackup, true);
mAdapterDTOs.clear(); // <--- clear the list before add
mAdapterDTOs.addAll(list); // <--- here is the double add if you do not clear before
mLazyAdatper.setDataSet(mAdapterDTOs);// update the adapter data (edit 2)
}
Edit: split answer in steps in order to be more clear the process also added at least one of your line to show where to add each code snippet.

Android: Return to the last position of adapter when refreshed

I know there are many questions asking about returning to the last position scrolled when the list has been refreshed. However I don't know why in my case (Adapter) the given answers don't work.
I have an adapter where at a given time it refreshes with new info and loads it in the adapter. What I want is that when it refreshes not come again to the top of the adapter and save the previous state.
Here is the code I use.
OnCreate
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_candidatos);
if (Titulacion.IsReachable1(getApplicationContext())){
new CargarCandidatos().execute();
timer();
}else{
Toast.makeText(getApplicationContext(), R.string.errorserver, Toast.LENGTH_LONG).show();
}
setListAdapter(adapter);
candidatosList = new ArrayList<HashMap<String, String>>();
The asynctask is divided in 2 parts. The retrieval of information and adapting the data into the adapter.
Here is the code of adapting it:
protected void onPostExecute(String file_url) {
runOnUiThread(new Runnable() {
public void run() {
adapter = new SimpleAdapter(
Monitorizacion.this, candidatosList,
R.layout.list_item, new String[] { TAG_ID,TAG_NSERIE,TAG_TABLET,
TAG_DNI, TAG_NOMBRE, TAG_TEST, TAG_PREGUNTA, TAG_BATERIA,TAG_CORRECTAS, TAG_ERRORES},
new int[] { R.id.autoid,R.id.id,R.id.tablet, R.id.dni, R.id.nombre, R.id.test, R.id.pregunta, R.id.bateria, R.id.correctas, R.id.fallos});
adapter.notifyDataSetChanged();
setListAdapter(adapter);
}
});
}
But how should I save the state of the adapter and then start showing the items considering the previous state.
Thank you
Edit: I have tried the answer approbed here Maintain/Save/Restore scroll position when returning to a ListView, but I cannot make it work.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_candidatos);
if (Titulacion.IsReachable1(getApplicationContext())){
new CargarCandidatos().execute();
timer();
}else{
Toast.makeText(getApplicationContext(), R.string.errorserver, Toast.LENGTH_LONG).show();
}
setListAdapter(adapter);
candidatosList = new ArrayList<HashMap<String, String>>();
lv = (ListView)findViewById(android.R.id.list);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String idd = ((TextView) view.findViewById(R.id.dni)).getText()
.toString();
Intent in = new Intent(getApplicationContext(),
MonitDetail.class);
in.putExtra("idd", idd);
startActivityForResult(in, 100);
}
});
}
//
//
public void timer(){
new CountDownTimer(tiempo, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
index = lv.getFirstVisiblePosition();
v = lv.getChildAt(0);
top = (v == null) ? 0 : v.getTop();
if (Titulacion.IsReachable1(getApplicationContext())){
new CargarCandidatos().execute();
timer();
}else{
Toast.makeText(getApplicationContext(), R.string.errorserver, Toast.LENGTH_LONG).show();
}
}
}.start();}
class CargarCandidatos extends AsyncTask<String, Void, String> {
protected String doInBackground(String... args) {
try {
monitorizar();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();}
return null;
}
protected void onPostExecute(String file_url) {
runOnUiThread(new Runnable() {
public void run() {
adapter = new SimpleAdapter(
Monitorizacion.this, candidatosList,
R.layout.list_item, new String[] { TAG_ID,TAG_NSERIE,TAG_TABLET,
TAG_DNI, TAG_NOMBRE, TAG_TEST, TAG_PREGUNTA, TAG_BATERIA,TAG_CORRECTAS, TAG_ERRORES},
new int[] { R.id.autoid,R.id.id,R.id.tablet, R.id.dni, R.id.nombre, R.id.test, R.id.pregunta, R.id.bateria, R.id.correctas, R.id.fallos});
lv.setSelectionFromTop(index, top);
adapter.notifyDataSetChanged();
lv.setAdapter(adapter);
}
});
}
}
public void monitorizar() throws Exception{
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("fecha",Titulacion.fecha()));
JSONObject json = jParser.makeHttpRequest(url_candidatos, "GET", params);
ArrayList<HashMap<String, String>> temp;
temp = new ArrayList<HashMap<String, String>>();
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
candidatos = json.getJSONArray(TAG_CANDIDATOS);
for (int i = 0; i < candidatos.length(); i++) {
JSONObject c = candidatos.getJSONObject(i);
String id = c.getString(TAG_ID);
String nserie = c.getString(TAG_NSERIE);
String tablet = c.getString(TAG_TABLET);
String dni = c.getString(TAG_DNI);
String nombre = c.getString(TAG_NOMBRE);
String test = c.getString(TAG_TEST);
String pregunta = c.getString(TAG_PREGUNTA);
String bateria = c.getString(TAG_BATERIA);
String correctas = c.getString(TAG_CORRECTAS);
String errores = c.getString(TAG_ERRORES);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_ID, id);
map.put(TAG_NSERIE, nserie);
map.put(TAG_TABLET, tablet);
map.put(TAG_DNI, dni);
map.put(TAG_NOMBRE, nombre);
map.put(TAG_TEST, test);
map.put(TAG_PREGUNTA, pregunta);
map.put(TAG_BATERIA, bateria);
map.put(TAG_CORRECTAS, correctas);
map.put(TAG_ERRORES, errores);
temp.add(map);
candidatosList = temp;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}

You can use like this
getListView().setSelection(position);
method of your ListView.
where you can get 'position' from the length of list you are passing to the adapter.

Declare you listview Globally and then you can keep the last position before New-Data-call. After then you can call listview for a position selection.

Search result displayed twice in list view

I would like to display the data from MySql in a listview using a search parameter in my application.
I've succeeded, but the problem I'm having is that every time I push the search button twice, both sets of result data are shown in the ListView, whereas I only want to display the latest set of results.
This is the code I'm using:
public class ListPerusahaan extends ListActivity {
/** Called when the activity is first created. */
private static final String TAG_ID = "id";
private static final String TAG_NAMA = "nama_perusahaan";
private static final String TAG_PEKERJAAN = "pekerjaan";
private static final String TAG_ALAMAT= "alamat";
private static final String TAG_DEADLINE = "deadline";
EditText keyword; Button search; private ProgressDialog pDialog; ArrayList<HashMap<String, String>> DataList; // JSONArray perusahaan = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listperusahaan);
keyword=(EditText)findViewById(R.id.Editsearch);
search=(Button)findViewById(R.id.search);
DataList = new ArrayList<HashMap<String, String>>();
search.setOnClickListener(new View.OnClickListener()
{
#Override public void onClick(View v) {
// TODO Auto-generated method stub
if (keyword.getText().toString().length() == 0 ) {
Toast toast = Toast.makeText(getApplicationContext(),"Please enter your keyword", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
else {
new searchData().execute();
}
}
});
}
#SuppressLint("NewApi") public class searchData extends AsyncTask<Void, Void, Void>
{
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ListPerusahaan.this);
pDialog.setMessage("Loading ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
// ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
List<NameValuePair> paramemeter = new ArrayList<NameValuePair>();
paramemeter.add(new BasicNameValuePair("keyword", keyword.getText().toString()));
JSONObject json = JSONParser.getJSONFromUrl("http://10.0.2.2/appmysql/dataperusahaan.php", paramemeter);
try{
JSONArray perusahaan = json.getJSONArray("perusahaan");
if (perusahaan != null)
{
for(int i=0;i<perusahaan.length();i++){
// HashMap<String, String> map1 = new HashMap<String, String>();
JSONObject jsonobj = perusahaan.getJSONObject(i);
// Storing each json item in variable
String id = jsonobj.getString(TAG_ID);
String nama_perusahaan = jsonobj.getString(TAG_NAMA);
String pekerjaan = jsonobj.getString(TAG_PEKERJAAN);
String alamat = jsonobj.getString(TAG_ALAMAT);
String deadline = jsonobj.getString(TAG_DEADLINE);
// creating new HashMap
HashMap<String, String> map1 = new HashMap<String, String>();
// adding each child node to HashMap key => value
map1.put(TAG_ID, id);
map1.put(TAG_NAMA, nama_perusahaan);
map1.put(TAG_PEKERJAAN, pekerjaan);
map1.put(TAG_ALAMAT, alamat);
map1.put(TAG_DEADLINE, deadline);
// adding HashList to ArrayList
DataList.add(map1);
}
}
else {
Toast toast= Toast.makeText(getApplicationContext(), "No data found", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}
catch(JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
ListPerusahaan.this, DataList,R.layout.row,
new String[] { TAG_NAMA, TAG_PEKERJAAN, TAG_ALAMAT, TAG_DEADLINE },
new int[] { R.id.nama_perusahaan, R.id.pekerjaan, R.id.alamat,R.id.deadline});
// updating listview
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
/*
#SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Toast.makeText(ListPerusahaan.this, "Perusahaan '" + o.get("nama_perusahaan") + "' was clicked.", Toast.LENGTH_SHORT).show();
*/
// getting values from selected ListItem
String nama = ((TextView) view.findViewById(R.id.nama_perusahaan)).getText().toString();
String pekerjaan = ((TextView) view.findViewById(R.id.pekerjaan)).getText().toString();
String alamat = ((TextView) view.findViewById(R.id.alamat)).getText().toString();
String deadline = ((TextView) view.findViewById(R.id.deadline)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), detail_lowongan.class);
in.putExtra(TAG_NAMA, nama);
in.putExtra(TAG_PEKERJAAN, pekerjaan);
in.putExtra(TAG_ALAMAT, alamat);
in.putExtra(TAG_DEADLINE, deadline);
startActivity(in);
}
});
}
});
}
}
}

Edit: in onclick clear DataList
search.setOnClickListener(){
......
DataList.clear(); //in onclick method
}
I am not sure whether you are looking for this or not...but if you don't want to allow duplicates in your list try ....
When the data filled in your list
Set<type> set=new Hashset(yourlist);
ArrayList<type> nodupList=new ArrayList<type>();
noduplist.addAll(set);
using this way it will remove the duplicates in your list
Edit:
Try this
After for loop
Set<HashMap> set=new HashSet(DataList);
ArrayList<HashMap> nodupList=new ArrayList<HashMap>();
nodupList.addAll(set);
DataList.clear();
DataList.addAll(nodupList);
try it may help you

Clear the DataList of the ArrayList type before populating it in the for loop.