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how to search data into json list view?

I am developing an apps. Where i Want to add a search functionality but i failed to do it. I try to search the whole list but my search is work only in one item in the list view.
Here is my MainActivity Code
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
private ProgressBar spinner;
ArrayList<HashMap<String, String>> arraylist;
private long lastPressedTime;
public static String imgURL = "url";
public static String VIDEO_ID = "videoId";
public static String TITLE = "title";
EditText editsearch;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
final boolean b=wifiManager.isWifiEnabled();
ConnectivityManager cManager=(ConnectivityManager)getSystemService(this.CONNECTIVITY_SERVICE);
final NetworkInfo nInfo=cManager.getActiveNetworkInfo();
if(nInfo!=null&& nInfo.isConnected()) {
Toast.makeText(this, "You are Connected to the Internet", Toast.LENGTH_LONG).show();
setContentView(R.layout.listview_main);
spinner = (ProgressBar)findViewById(R.id.progressBar1);
new DownloadJSON().execute();
}
else {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Your DATA Connection is Currently Unreachable")
.setMessage("Connect your WiFi or 2G/3G DATA Connection")
.setPositiveButton("WiFi ", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
try {
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
final Intent mainIntent = new Intent(MainActivity.this, MainActivity.class);
MainActivity.this.startActivity(mainIntent);
MainActivity.this.finish();
}
}, 5000);
wifiManager.setWifiEnabled(true);
Toast.makeText(MainActivity.this, "WiFi Enabling in 5sec Please Wait", Toast.LENGTH_LONG).show();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
})
.setNegativeButton("3G/2G ", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
//use here tablayout to work when 3G/2G connecion is available
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
final Intent mainIntent = new Intent(MainActivity.this, MainActivity.class);
MainActivity.this.startActivity(mainIntent);
MainActivity.this.finish();
}
}, 5000);
Intent myints = new Intent(Settings.ACTION_DATA_ROAMING_SETTINGS);
Toast.makeText(MainActivity.this, "Your DATA Connection is NOW Connected", Toast.LENGTH_LONG).show();
startActivity(myints);
}
})
.setNeutralButton("Exit", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "To use this Application you have to Connected to the Internet", Toast.LENGTH_LONG).show();
finish();
}
})
.setCancelable(false)
.show();
}
}
public class DownloadJSON extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
spinner.setVisibility(View.VISIBLE);
}
#Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL("https://www.googleapis.com/youtube/v3/search?part=id%2Csnippet&q=bangla+video+song&maxResults=50&key=api_key");
try {
// Locate the array name in JSON
JSONArray jsonarray = jsonobject.getJSONArray("items");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
JSONObject jsonObjId = jsonobject.getJSONObject("id");
map.put("videoId", jsonObjId.getString("videoId"));
JSONObject jsonObjSnippet = jsonobject.getJSONObject("snippet");
map.put("title", jsonObjSnippet.getString("title"));
//map.put("description", jsonObjSnippet.getString("description"));
// map.put("flag", jsonobject.getString("flag"));
JSONObject jsonObjThumbnail = jsonObjSnippet.getJSONObject("thumbnails");
String imgURL = jsonObjThumbnail.getJSONObject("high").getString("url");
map.put("url",imgURL);
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
spinner.setVisibility(View.GONE);
editsearch = (EditText) findViewById(R.id.search);
// Capture Text in EditText
editsearch.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
adapter.filter(text);
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
}
}
// Dialouge Box
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//Handle the back button
if (keyCode == KeyEvent.KEYCODE_BACK) {
//Ask the user if they want to quit
new android.support.v7.app.AlertDialog.Builder (this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle(R.string.quit)
.setMessage(R.string.really_quit)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
//Stop the activity
MainActivity.this.finish();
}
})
.setNeutralButton(R.string.neutral, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Rate This App", Toast.LENGTH_SHORT).show();
startActivity(new Intent("android.intent.action.VIEW", Uri.parse("https://play.google.com/store/apps/details?id=")));
}
})
.setNegativeButton(R.string.no, null)
.show();
return true;
} else {
return super.onKeyDown(keyCode, event);
}
}
and here is my list view adapter code.
// Declare Variables
MainActivity main;
private PublisherInterstitialAd mPublisherInterstitialAd;
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View view, ViewGroup parent) {
// Declare Variables
TextView country;
ImageView flag;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.listview_item, parent, false);
// Get the position
resultp = data.get(position);
// Locate the TextViews in listview_item.xml
//rank = (TextView) itemView.findViewById(R.id.rank);
country = (TextView) itemView.findViewById(R.id.country);
// population = (TextView) itemView.findViewById(R.id.population);
// Locate the ImageView in listview_item.xml
flag = (ImageView) itemView.findViewById(R.id.flag);
// Capture position and set results to the TextViews
// rank.setText(resultp.get(MainActivity.VIDEO_ID));
country.setText(resultp.get(MainActivity.TITLE));
// population.setText(resultp.get(MainActivity.DESCRIPTION));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class
imageLoader.DisplayImage(resultp.get(MainActivity.imgURL), flag);
// Capture ListView item click
itemView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// Get the position
resultp = data.get(position);
Intent intent = new Intent(context, PlayerViewDemoActivity.class);
intent.putExtra("videoId", resultp.get(MainActivity.VIDEO_ID));
context.startActivity(intent);
mPublisherInterstitialAd.isLoaded();
mPublisherInterstitialAd.show();
requestNewInterstitial();
}
});
return itemView;
}
private void requestNewInterstitial() {
PublisherAdRequest adRequest = new PublisherAdRequest.Builder()
.addTestDevice("020AC93F90A14C29209AF3CA716FFBD4")
.build();
mPublisherInterstitialAd.loadAd(adRequest);
}
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
data.clear();
if (charText.length() == 0) {
data.add(resultp); // resultp is hashmap
} else {
if (resultp.get(MainActivity.TITLE).toLowerCase(Locale.getDefault())
.contains(charText)) {
data.add(resultp);
}
}
notifyDataSetChanged();
}
}

You should declare one more ArrayList name allData, it always store all objects.
ArrayList<HashMap<String, String>> allOriginalData; // always store all object
ArrayList<HashMap<String, String>> data; // use for store object that display in the ListView
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
allOriginalData = new ArrayList<HashMap<String, String>>(arraylist);
imageLoader = new ImageLoader(context);
}
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
data.clear();
if (charText.length() == 0) {
// search empty -> new data = all original data
data = new ArrayList<HashMap<String, String>>(allData);
} else {
// loop all original data
// check the condition and make the new data for display in ListView
for(int i = 0; i < allOriginalData.size(); i++){
HashMap<String, String> resultA = allOriginalData.get(i);
if (resultA.get(MainActivity.TITLE).toLowerCase(Locale.getDefault())
.contains(charText)) {
data.add(resultA);
}
}
}
notifyDataSetChanged();
}

Filter returns empty listview

Hi I am trying a search/filter app where data are coming from mySql database to fill up the listview. The populating of listview is working perfectly fine, except for the filtering part. It doesn't filter the listview, it's empty. Help please.
MAIN Activity:
public class MainActivity extends Activity {
public static final String url = "";
// Declare Variables
ListView list;
ListViewAdapter adapter;
EditText editsearch;
String[] rank;
String[] country;
String[] population;
ArrayList<WorldPopulation> arraylist = new ArrayList<WorldPopulation>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Generate list View from ArrayList
displayListView();
// Locate the ListView in listview_main.xml
list = (ListView) findViewById(R.id.listview);
// Pass results to ListViewAdapter Class
adapter = new ListViewAdapter(this, arraylist);
// Binds the Adapter to the ListView
list.setAdapter(adapter);
// Locate the EditText in listview_main.xml
editsearch = (EditText) findViewById(R.id.search);
// Capture Text in EditText
editsearch.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
adapter.filter(text);
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
}
private void displayListView() {
// Creating volley request obj
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>(){
#Override
public void onResponse(String response) {
parseData(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void parseData(String json) {
JSONArray items = null;
JSONObject jsonObject=null;
try {
jsonObject = new JSONObject(json);
items = jsonObject.getJSONArray("result");
rank = new String[items.length()];
country = new String[items.length()];
population = new String[items.length()];
for (int i = 0; i < items.length(); i++) {
JSONObject jo = items.getJSONObject(i);
rank[i] = jo.getString("rank");
country[i] = jo.getString("country");
population[i] = jo.getString("population");
WorldPopulation wp = new WorldPopulation(rank[i], country[i],
population[i]);
// Binds all strings into an array
arraylist.add(wp);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
BASE Adapter:
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context mContext;
LayoutInflater inflater;
private List<WorldPopulation> worldpopulationlist = null;
private ArrayList<WorldPopulation> arraylist;
public ListViewAdapter(Context context, List<WorldPopulation> worldpopulationlist) {
mContext = context;
this.worldpopulationlist = worldpopulationlist;
inflater = LayoutInflater.from(mContext);
this.arraylist = new ArrayList<WorldPopulation>();
this.arraylist.addAll(worldpopulationlist);
}
public class ViewHolder {
TextView rank;
TextView country;
TextView population;
}
#Override
public int getCount() {
return worldpopulationlist.size();
}
#Override
public WorldPopulation getItem(int position) {
return worldpopulationlist.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.listview_item, null);
// Locate the TextViews in listview_item.xml
holder.rank = (TextView) view.findViewById(R.id.rank);
holder.country = (TextView) view.findViewById(R.id.country);
holder.population = (TextView) view.findViewById(R.id.population);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// Set the results into TextViews
holder.rank.setText(worldpopulationlist.get(position).getRank());
holder.country.setText(worldpopulationlist.get(position).getCountry());
holder.population.setText(worldpopulationlist.get(position).getPopulation());
// Listen for ListView Item Click
view.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// Send single item click data to SingleItemView Class
Intent intent = new Intent(mContext, SingleItemView.class);
// Pass all data rank
intent.putExtra("rank",(worldpopulationlist.get(position).getRank()));
// Pass all data country
intent.putExtra("country",(worldpopulationlist.get(position).getCountry()));
// Pass all data population
intent.putExtra("population",(worldpopulationlist.get(position).getPopulation()));
// Pass all data flag
// Start SingleItemView Class
mContext.startActivity(intent);
}
});
return view;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
worldpopulationlist.clear();
if (charText.length() == 0) {
worldpopulationlist.addAll(arraylist);
}
else
{
for (WorldPopulation wp : arraylist)
{
if (wp.getCountry().toLowerCase(Locale.getDefault()).contains(charText))
{
worldpopulationlist.add(wp);
}
}
}
notifyDataSetChanged();
}
And the model:
public class WorldPopulation {
private String rank;
private String country;
private String population;
public WorldPopulation(String rank, String country, String population) {
this.rank = rank;
this.country = country;
this.population = population;
}
public String getRank() {
return this.rank;
}
public String getCountry() {
return this.country;
}
public String getPopulation() {
return this.population;
}
}

notifyDataSetChanged not working in AsyncTask inside BaseAdapter class

i have created a list of ads in listview using BaseAdapter and i want to delete a single ad from list. To delete a single ad i have to request a web api using asynchronous task, so i have added the notifyDataSetChanged() in onPostExecute method. ads was deleted successfully but notifydatasetchnaged not working .my custom BaseAdapter class is given below please help to solve this problem.
public class AdsListAdapter extends BaseAdapter{
private Activity activity;
ArrayList<String> title;
ArrayList<Long> adsIds;
SessionManager sessions;
AlertDialogManager alert = new AlertDialogManager();
private static LayoutInflater inflater=null;
String MYTAG="AdLIst";
long userID=0;
public AdsListAdapter(Activity a,ArrayList<String> titlelist,ArrayList<Long> adsId,long userid) {
activity = a;
title=titlelist;
adsIds=adsId;
userID=userid;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
sessions=new SessionManager(activity.getApplicationContext());
imageLoader = new ImageLoader(activity.getApplicationContext());
}
public int getCount() {
return title.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public static class ViewHolder{
public TextView titles,editicon,delicon;
}
#SuppressLint("NewApi") public View getView(int position, View convertView, ViewGroup parent) {
final int id=position;
View vi=convertView;
ViewHolder holder;
if(convertView==null){
vi = inflater.inflate(R.layout.adscustomlist, null);
holder = new ViewHolder();
holder.titles = (TextView) vi.findViewById(R.id.titles);
holder.editicon= (TextView) vi.findViewById(R.id.editicon);
holder.delicon= (TextView) vi.findViewById(R.id.delicon);
vi.setTag( holder );
}
else
{ holder=(ViewHolder)vi.getTag(); }
holder.titles.setText(title.get(position));
holder.delicon.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new DeleteAd(userID,adsIds.get(id)).execute();
}
});
return vi;
}
class DeleteAd extends AsyncTask<String,Void,Void>
{
AlertDialogManager alert = new AlertDialogManager();
private String Error = null,Message=null;
long UserID =0,AdId=0;
boolean Status=false;
private ProgressDialog Dialog = new ProgressDialog(activity);
protected void onPreExecute() {
Dialog.setMessage("Loading ...");
Dialog.setCanceledOnTouchOutside(false);
Dialog.show();
}
public DeleteAd(long UserID,long AdId) {
this.UserID=UserID;
this.AdId=AdId;
}
#Override
protected Void doInBackground(String... arg0) {
JSONObject json;
try {
json = new JSONObject(postDataAdDelete());
Message=json.getString("Message");
Status = json.getBoolean("Status");
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Void unused) {
Dialog.dismiss();
alert.showAlertDialog(activity, "Ad Delete", Message, Status);
notifyDataSetChanged();
}
}
}

Try to call notifyDataSetChanged() method like this
activity.runOnUiThread(new Runnable() {
#Override
public void run() {
notifyDataSetChanged();
}
});

you must remove value at position you want to delete in list title. Try title.remove(position)

AdsListAdapter adapter = new AdsListAdapter (Activity ,ArrayList<String> ,ArrayList<Long> ,long );//pass the value
adapter.notifyDataSetChanged();

Custom adapter never empty

I've custom adapter that populates custom listview with data fetched from server. What I want is check if adapter is empty and append data to listview if it is empty else fill the listview with data and notifyDataSetChanged. I'm implementing OnScrollListener to load more data from server. But adapter never is empty and always notifyDataSetChanged is called.
My List Activity
public class ListResultActivity extends Activity implements OnScrollListener{
private ArrayList<BusinessListData> businesses;
private ListView businessList;
private LayoutInflater layoutInflator;
private BusinessListIconTask imgFetcher;
BusinessListDataAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.businesslist);
this.businessList = (ListView) findViewById(R.id.lvBusinesslist);
this.adapter= new BusinessListDataAdapter(this,
this.imgFetcher, this.layoutInflator, this.businesses);
getData();
businessList.setOnScrollListener(this);
}
#Override
public Object onRetainNonConfigurationInstance() {
Object[] myStuff = new Object[2];
myStuff[0] = this.businesses;
myStuff[1] = this.imgFetcher;
return myStuff;
}
/**
* Bundle to hold refs to row items views.
*
*/
public static class MyViewHolder {
public TextView businessName, businessAddress, phoneNo;
public Button btnProfile;
public ImageView icon;
public BusinessListData business;
}
public void setBusinesses(ArrayList<BusinessListData> businesses) {
this.imgFetcher = new BusinessListIconTask(this);
this.layoutInflator = LayoutInflater.from(this);
this.businesses = businesses;
if(adapter !=null){
this.adapter.notifyDataSetChanged();
}else{
this.adapter= new BusinessListDataAdapter(this,
this.imgFetcher, this.layoutInflator, this.businesses);
businessList.setAdapter(adapter);
}
}
private void getData() {
// TODO Auto-generated method stub
Intent myIntent = getIntent();
// gets the arguments from previously created intent
String metroTxt = myIntent.getStringExtra("key");
String metroLoc = myIntent.getStringExtra("loc");
String metroId = myIntent.getStringExtra("qt");
BusinessListApiTask spTask = new BusinessListApiTask(
ListResultActivity.this);
try {
spTask.execute(metroTxt, metroLoc, metroId);
} catch (Exception e) {
spTask.cancel(true);
}
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
if (businessList.getLastVisiblePosition() == totalItemCount - 1) {
getData();
adapter.notifyDataSetChanged();
Log.d("test count", "abc"+totalItemCount);
}
}
}
Class to fetch data from server and set to adapter
public class BusinessListApiTask extends AsyncTask<String, Integer, String> {
private ProgressDialog progDialog;
private Context context;
private ListResultActivity activity;
private static final String debugTag = "sodhpuch";
HashMap<String, String> queryValues;
/**
* Construct a task
*
* #param activity
*/
public BusinessListApiTask(ListResultActivity activity) {
// TODO Auto-generated constructor stub
super();
this.activity = activity;
this.context = this.activity.getApplicationContext();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
progDialog = ProgressDialog.show(this.activity, "Search", this.context
.getResources().getString(R.string.looking_for_business), true,
false);
}
#Override
protected String doInBackground(String... params) {
try {
// Log.d(debugTag, "Background:" +
// Thread.currentThread().getName());
String result = BusinessListHelper.downloadFromServer(params);
// try {
//
// updateSQLite(result);
//
// } catch (Exception e) {
// return result;
// }
Log.d("result", result);
return result;
} catch (Exception e) {
return new String();
}
}
#Override
protected void onPostExecute(String result) {
ArrayList<BusinessListData> businessData = new ArrayList<BusinessListData>();
progDialog.dismiss();
try {
JSONObject respObj = new JSONObject(result);
int success = respObj.getInt("success");
Log.d("Success", "abc"+success);
if (success == 1) {
JSONArray tracks = respObj.getJSONArray("idioms");
for (int i = 0; i < tracks.length(); i++) {
JSONObject track = tracks.getJSONObject(i);
String businessName = track.getString("name");
String businessAddress = track.getString("address");
String phone = track.getString("phone");
String id = track.getString("id");
String deals_in = track.getString("deals_in");
businessData.add(new BusinessListData(businessName,
businessAddress, id, phone, deals_in));
}
} else {
Log.d("Success", "first"+success);
// Log.d(debugTag, "Background:" + result);
// DBController controller = new DBController(context);
// businessData = controller.getBusinessList();
return ;
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// }
this.activity.setBusinesses(businessData);
}
My Adapter
public class BusinessListDataAdapter extends BaseAdapter implements
OnClickListener {
private static final String debugTag = "BusinessListDataAdapter";
private ListResultActivity activity;
private BusinessListIconTask imgFetcher;
private LayoutInflater layoutInflater;
private ArrayList<BusinessListData> businesses;
BusinessListData business;
public BusinessListDataAdapter(ListResultActivity a,
BusinessListIconTask i, LayoutInflater l,
ArrayList<BusinessListData> data) {
this.activity = a;
this.imgFetcher = i;
this.layoutInflater = l;
this.businesses = data;
}
#Override
public int getCount() {
return this.businesses.size();
}
public void clear()
{
businesses.clear();
notifyDataSetChanged();
}
#Override
public boolean areAllItemsEnabled() {
return true;
}
#Override
public Object getItem(int arg0) {
return null;
}
#Override
public long getItemId(int pos) {
return pos;
}
#Override
public View getView(int pos, View convertView, ViewGroup parent) {
MyViewHolder holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.trackrow, parent,
false);
holder = new MyViewHolder();
holder.businessName = (TextView) convertView
.findViewById(R.id.tvBusinessName);
holder.businessAddress = (TextView) convertView
.findViewById(R.id.tvAddress);
holder.phoneNo = (TextView) convertView.findViewById(R.id.tvPhone);
holder.icon = (ImageView) convertView.findViewById(R.id.album_icon);
holder.btnProfile = (Button) convertView
.findViewById(R.id.btnProfile);
holder.btnProfile.setTag(holder);
convertView.setTag(holder);
} else {
holder = (MyViewHolder) convertView.getTag();
}
convertView.setOnClickListener(this);
business= businesses.get(pos);
holder.business = business;
holder.businessName.setText(business.getName());
holder.businessAddress.setText(business.getAddress());
holder.phoneNo.setText(business.getPhone());
holder.btnProfile.setOnClickListener(this);
// if(track.getImageUrl() != null) {
// holder.icon.setTag(track.getImageUrl());
// Drawable dr = imgFetcher.loadImage(this, holder.icon);
// if(dr != null) {
// holder.icon.setImageDrawable(dr);
// }
// } else {
holder.icon.setImageResource(R.drawable.filler_icon);
// }
return convertView;
}
#Override
public void onClick(View v) {
String deals_in = business.getDeals().toString();
Log.d("name", deals_in);
MyViewHolder holder = (MyViewHolder) v.getTag();
if (v instanceof Button) {
Intent profile = new Intent(activity,
ProfileActivity.class);
profile.putExtra("deals_in", deals_in);
profile.putExtra("phone", holder.business.getPhone());
profile.putExtra("address", holder.business.getAddress());
profile.putExtra("name", holder.business.getName());
this.activity.startActivity(profile);
} else if (v instanceof View) {
Log.d("test","call testing");
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" +holder.business.getPhone()));
this.activity.startActivity(intent);
}
Log.d(debugTag, "OnClick pressed.");
}
}

Try this way,hope this will help you to solve your problem.
public void setBusinesses(ArrayList<BusinessListData> businesses) {
imgFetcher = new BusinessListIconTask(this);
layoutInflator = LayoutInflater.from(this);
if(this.businesses == null || adapter==null){
this.businesses = new ArrayList<BusinessListData>();
adapter= new BusinessListDataAdapter(this,imgFetcher,layoutInflator,this.businesses);
businessList.setAdapter(adapter);
}
this.businesses.addAll(businesses);
adapter.notifyDataSetChanged();
}

You have the adapter object in your setBusinesses Method. You just need to check the size of the adapter too as follows which is solve your problem.
if(adapter !=null && adapter.getCount()>0)
{
this.adapter.notifyDataSetChanged();
}
else
{
this.adapter= new BusinessListDataAdapter(this,
this.imgFetcher, this.layoutInflator, this.businesses);
businessList.setAdapter(adapter);
}
this will check the size of your BusinessListData object in the adapter and this will not initialize the adapter again and again.
Hope this Solves your problem.
Thank You!

Change use of OnScrollListener. Use Asynctask class and onPreExecute() set adapter as null. Load data in doInBackground() method and call custom adapter in onPostExecute(). I hope it 'll work fine.

App crashes on android 4.0+

I have and android app that works on android 4.0 great, but it crashes on android 4.3 and 4.4. I get this from the logCat
01-11 14:40:27.669: E/ACRA(25835): ACRA caught a IllegalStateException exception for quran. Building report.
01-11 14:40:27.789: E/AndroidRuntime(25835): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131099688, class android.widget.ListView) with Adapter(class quran.functions.PlaylistAdapter)]
Here is my code:
public class Playlist extends FragmentActivity {
private ListView list;
private Button manager, downloadAll;
private TextView reciter;
public static PlaylistAdapter adapter;
private ArrayList<Songs> songs;
private int RECITER_ID;
private String url, title, label;
private SlidingMenu slidingMenu;
private DatabaseHelper db;
private ImageView nowPlaying, back;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playlist);
initWidgets();
list.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
Intent intent = new Intent(Playlist.this, PlayerFinal.class);
intent.putExtra("songs", songs);
if (getIntent().getIntExtra("duaa", -1) == 115)
intent.putExtra("lang", 115);
intent.putExtra("position", position);
intent.putExtra("fromClass", this.getClass() + "");
// intent.putExtra("mp3link", mp3link);
startActivity(intent);
}
});
new AsyncTask<Void, Void, Void>() {
#Override
protected Void doInBackground(Void... params) {
XmlMapParser m = new XmlMapParser(Playlist.this, RECITER_ID);
HashMap<String, ArrayList<String>> map = m.convert();
map.keySet();
label = map.get("RecitorLabel").get(0);
title = map.get("Title").get(0);
url = map.get("Link").get(0);
back = (ImageView) findViewById(R.id.playlist_back);
back.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
finish();
}
});
db.openDB();
for (int i = 1; i < map.get("Link").size(); i++) {
if (db.isDownloaded(i, title, RECITER_ID)) {
songs.add(new Songs(i, map.get("Title").get(i),
Environment.getExternalStorageDirectory()
.getPath()
+ "/"
+ getString(R.string.app_name)
+ "/"
+ title
+ "/"
+ map.get("Title").get(i)
+ ".mp3", title, true, RECITER_ID,
false));
} else
songs.add(new Songs(i, map.get("Title").get(i), url
+ label + "/"
+ new DecimalFormat("000").format(i) + ".mp3",
title, false, RECITER_ID, false));
}
db.closeDB();
// Log.v("--",m.convert().get("Link").get(1));
// [RecitorLabel, Title, Link] THIS ARE THE KEYS m
// Log.v("--", map.get("RecitorLabel").get(0));
// Log.v("--", map.get("Link").get(1));
return null;
}
protected void onPostExecute(Void result) {
adapter = new PlaylistAdapter(Playlist.this, songs);
list.setAdapter(adapter);
reciter.setText(songs.get(0).getRecitorName());
};
}.execute();
}
#Override
public void onBackPressed() {
if (slidingMenu.isMenuShowing()) {
slidingMenu.toggle();
} else {
super.onBackPressed();
}
}
#Override
protected void onResume() {
super.onResume();
try {
if (Tplayer.getInstance().isPlaying()) {
adapter = new PlaylistAdapter(this, songs);
list.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_MENU) {
this.slidingMenu.toggle();
return true;
}
return super.onKeyDown(keyCode, event);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.slidingMenu.toggle();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void initWidgets() {
db = new DatabaseHelper(this);
manager = (Button) findViewById(R.id.playlist_download_manager);
manager.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Playlist.this, DownloadManager.class);
startActivity(intent);
}
});
reciter = (TextView) findViewById(R.id.playlist_reciter_name_top);
list = (ListView) findViewById(R.id.playlist_list);
downloadAll = (Button) findViewById(R.id.playlist_download_all);
manager = (Button) findViewById(R.id.playlist_download_manager);
songs = new ArrayList<Songs>();
RECITER_ID = getIntent().getIntExtra("filename", -1);
// downloadAll.setOnClickListener(new OnClickListener() {
//
// #Override
// public void onClick(View v) {
// new DownloadAll(Playlist.this, songs);
// db.openDB();
// for (int i = 0; i < songs.size(); i++) {
// db.addDownloaded(songs.get(i).getNumber(), songs.get(i)
// .getLink(), 0, songs.get(i).getRecitorID(), "",
// songs.get(i).getTitle());
// }
// db.closeDB();
// }
// });
nowPlaying = (ImageView) findViewById(R.id.playlist_now_playing);
nowPlaying.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Tplayer tplayer = Tplayer.getInstance();
if (tplayer.isPlaying()) {
Intent intent = new Intent(Playlist.this, PlayerFinal.class);
if (tplayer.isPlaying())
intent.putExtra("songs", tplayer.getSongs());
else
intent.putExtra("songs", songs);
if (tplayer.getSongs().size() == 14)
intent.putExtra("lang", 115);
intent.putExtra("position", tplayer.getPosition());
startActivity(intent);
}
}
});
// Jeremy Feinstein slidinglistadapter line 94
slidingMenu = new SlidingMenu(this);
slidingMenu.setMode(SlidingMenu.LEFT);
slidingMenu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);
slidingMenu.setShadowWidthRes(R.dimen.slidingmenu_shadow_width);
slidingMenu.setShadowDrawable(R.drawable.slidingmenu_shadow);
slidingMenu.setBehindOffsetRes(R.dimen.slidingmenu_offset);
slidingMenu.setFadeDegree(0.35f);
slidingMenu.attachToActivity(this, SlidingMenu.SLIDING_CONTENT);
slidingMenu.setMenu(R.layout.slidingmenu);
}
}
and my playlist adapter class:
public class PlaylistAdapter extends BaseAdapter {
private Activity activity;
private static LayoutInflater inflater = null;
private ArrayList<Songs> data;
private DatabaseHelper db;
private SharedPreferences prefs;
int playpos;
int recitorID;
public PlaylistAdapter(Activity a, ArrayList<Songs> songs) {
activity = a;
data = songs;
db = new DatabaseHelper(a);
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
prefs = activity.getSharedPreferences("quantic.Quran",
Context.MODE_PRIVATE);
recitorID = prefs.getInt("recID", -1);
playpos = prefs.getInt("posPlaying", -1);
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
final ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.song_item, parent, false);
ImageView download = (ImageView) vi
.findViewById(R.id.playlist_item_download);
db.openDB();
if (db.isDownloaded(data.get(position).getNumber(), data.get(position)
.getRecitorName(), data.get(position).getRecitorID()))
download.setImageResource(R.drawable.download_yes);
else {
download.setImageResource(R.drawable.download_no);
download.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
new DownloadFileFromURL(activity, data.get(position)
.getRecitorName(), data.get(position).getTitle(),
data.get(position).getLink(), data.get(position)
.getNumber(), data.get(position)
.getRecitorID()).execute();
if (!db.isDBOpen())
db.openDB();
db.addDownloaded(data.get(position).getNumber(),
data.get(position).getLink(), 0, data.get(position)
.getRecitorID(), "", data.get(position)
.getTitle());
Toast.makeText(activity,
"Downloading " + data.get(position).getTitle(),
Toast.LENGTH_SHORT).show();
}
});
}
db.closeDB();
TextView number = (TextView) vi.findViewById(R.id.playlist_item_num);
TextView reciterName = (TextView) vi
.findViewById(R.id.playlist_item_reciterName);
reciterName.setText(data.get(position).getRecitorName());
if (activity.getClass() == Playlist.class) {
reciterName.setVisibility(View.GONE);
}
TextView title = (TextView) vi.findViewById(R.id.playlist_item_reciter);
title.setText(data.get(position).getTitle());
number.setText((position + 1) + "");
ImageView eq = (ImageView) vi.findViewById(R.id.playlist_item_equlizer);
if (Tplayer.getInstance().isPlaying())
if (Tplayer.getInstance().getPosition() == position
&& data.get(position).getRecitorID() == Tplayer
.getInstance().getSong().getRecitorID()) {
eq.setVisibility(View.VISIBLE);
Ion.with(eq).load("http://darkodev.info/quran/dots.gif");
} else {
eq.setVisibility(View.GONE);
}
return vi;
}
}

Very old question, but no answer. I'm sure you have found a fix by now, but anyway.
You're changing the songs list object in background, and if Android decides to redraw your list (user scrolls your list), effectively accessing the songs list object, it may have changed and cause this exception to be thrown.
You need to use a temporary songs list and create a new adapter with it to update your list, thus not changing the current adapter list until you set a new adapter from the main UI thread.