Develop Reference

dynamic listview adding “Load more items” at the end of scroll

I have a listview fetching data from sql database by Json.
I want to turn it into dynamic listview that at the end of scroll, a "load more items" appears in the footer of the list while loading more items and adding them to the adapter (for example 10 items each time). I have problem in implementing this feature. Please help me with it.Thankx.
Activity Class:
public class MoreVideos extends ListActivity {
int i =1;
private int dateCode = 1;
private ListArrayAdapter listAdapter = null;
private ProgressDialog pDialog = null;
private String id;
#SuppressWarnings("unused")
ArrayList<videoDto> aryLists =null;
String getDate;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.more_video);
id=getIntent().getStringExtra("id");
pDialog = new ProgressDialog(getApplicationContext());
pDialog.setMessage("Loading....");
pDialog.setCancelable(true);
loadCategoriesAsync();
};
// TODO Auto-generated method stub
protected void loadCategoriesAsync() {
loadCategoriesTaskHandler task = new loadCategoriesTaskHandler();
if (Build.VERSION.SDK_INT >= 11)
{
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
else
{
task.execute();
}
}
class loadCategoriesTaskHandler extends AsyncTask<videoDto, Void, String>
{
#Override
protected String doInBackground(videoDto... params)
{
String results= "";
try
{
videoDto videodto=new videoDto();
// healthDto.getInfom(strEail.trim(),strPassword,getApplicationContext());
aryLists = new ArrayList<videoDto>();
aryLists= videodto.getvideo(id);
}
catch (Exception e)
{
e.printStackTrace();
}
return results;
}
#Override
protected void onPostExecute(String result)
{
super.onPostExecute(result);
if(aryLists!=null){
listAdapter = new ListArrayAdapter(getApplicationContext(), MoreVideos.this,
aryLists);
setListAdapter(listAdapter);
}else{
Toast.makeText(getApplicationContext(), "ArrayList is null ", Toast.LENGTH_SHORT).show();
}
}
}
Adapter Class:
public class ListArrayAdapter extends ArrayAdapter<videoDto> {
private final Context context;
private MoreVideos _parent;
public ListArrayAdapter(Context context, MoreVideos parent,
ArrayList<videoDto> aryLog) {
super(context, R.layout.video_listing, aryLog);
this.context = context;
this._parent = parent;
}
#SuppressLint("InflateParams")
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflate = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflate.inflate(R.layout.video_listing,
null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.index = (TextView) rowView
.findViewById(R.id.index);
viewHolder.NameOfVideo = (TextView) rowView
.findViewById(R.id.txt_name_video);
viewHolder.img = (ImageView) rowView
.findViewById(R.id.img_video);
viewHolder.rel= (RelativeLayout) rowView.findViewById(R.id.click);
viewHolder.bookv = (ImageView)rowView.findViewById(R.id.bookv);
//viewHolder.download = (ImageView)rowView.findViewById(R.id.download);
rowView.setTag(viewHolder);
rowView.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
final videoDto userLog = (this._parent != null) ? this._parent.listAdapter
.getItem(position) : null;
String currentPosition = Integer.toString(position);
if (userLog != null) {
try {
try {
/* if(currentPosition.equals(""))
{
holder.index.setText("-----");
}
else
{
holder.index.setText(Integer.toString(Integer.parseInt(currentPosition) + 1));
}*/
holder.rel.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name =userLog.link ;
/*try {
MediaPlayer player = new MediaPlayer();
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setDataSource("http://xty/MRESC/images/test/xy.mp3");
player.prepare();
player.start();
} catch (Exception e) {
// TODO: handle exception
}*/
//Log.v("String ", speaker.vid);
Intent mainIntent = new Intent(getApplicationContext(),VideoViewActivity.class);
mainIntent.putExtra("IMGNAME", name);
//Log.v("name",name);
// startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse(name)));
startActivity(mainIntent);
}
});
holder.bookv.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
// String jobId = (String) v.getTag();
String name =userLog.link ;
videoDto videodto = (videoDto) v.getTag();
Intent intentJobApplicants = new Intent(getApplicationContext(),VideoViewActivity.class);
intentJobApplicants.putExtra("IMGNAME",name);
// intentJobApplicants.putExtra("JobId", jobAp.id);
startActivity(intentJobApplicants);
}
});
if (userLog.VideoText.equals("")) {
holder.NameOfVideo.setText("-----");
} else {
holder.NameOfVideo.setText(userLog.VideoText);
}
i=i+1;
Log.v("i",String.valueOf(i));
} catch (Exception ex) {
// Toast.makeText(context, ex.getMessage(),
// Toast.LENGTH_SHORT).show();
}
if (position % 2 == 0) {
rowView.setBackgroundColor(Color.LTGRAY);
} else {
rowView.setBackgroundColor(Color.WHITE);
}
}catch(Exception ex){
ex.printStackTrace();
}
}
return rowView;
}
}
}
View Holder Class:
public static class ViewHolder {
protected TextView index;
protected ImageView bookv;
protected ImageView img;
protected ImageView download;
protected TextView NameOfVideo;
protected RelativeLayout rel;
}

how can i pass the image URL from activity to Alert Dialog box as a imageview?

Here is my CartRowHolder
class CartRowHolder {
ImageView icon;
TextView txtprice,txttitle,personalize;
TextView txtquantity;
ImageView imgdelete,imgedit,image;
public CartRowHolder(View v) {
icon=(ImageView)v.findViewById(R.id.imageicon);
txtprice=(TextView)v.findViewById(R.id.txtoprice);
txttitle=(TextView)v.findViewById(R.id.txtotitle);
txtquantity=(TextView)v.findViewById(R.id.txtoquantity);
personalize=(TextView)v.findViewById(R.id.txtpersonalize);
imgdelete=(ImageView)v.findViewById(R.id.imgdelete);
imgedit=(ImageView)v.findViewById(R.id.edit);
}
}
Now in the ListView a ImageView and Delete Button, Edit button is there So as i click on the Edit a Dialogbox is open and in the Dialogbox i want to pass the imageView.....and i have the ImageUrl
class CartAdapter extends BaseAdapter {
Activity activity;
List<CartItem> cartItemList;
ImageLoader imageLoader;
LayoutInflater layoutInflater;
CartItem cartItem;
AppPreferenceManager appPreferenceManager;
public CartAdapter(Activity activity,List<CartItem>cartItemList) {
this.activity=activity;
this.cartItemList=cartItemList;
appPreferenceManager=new AppPreferenceManager(activity);
}
public int getCount() {
return cartItemList.size();
}
#Override
public Object getItem(int position) {
return cartItemList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
cartItem=cartItemList.get(position);
CartRowHolder cartRowHolder;
Bundle extras = getIntent().getExtras();
TextView tk;
if (extras != null) {
}
if(imageLoader==null) {
imageLoader=new ImageLoader(activity);
}
if(layoutInflater==null) {
layoutInflater=(LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
if(convertView==null) {
convertView=layoutInflater.inflate(R.layout.order_row,null);
cartRowHolder=new CartRowHolder(convertView);
cartRowHolder.imgdelete.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CartItem cartItem=cartItemList.get(position);
deletCartItem(cartItem.getPid());
}
});
cartRowHolder.imgedit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final CartItem cartItem=cartItemList.get(position);
ImageView image;
final EditText personalise;
Button update;
final TextView quan,title1;
final ImageButton plusd,minusd;
final AlertDialog alertDialog;
View view=getLayoutInflater().inflate(R.layout.activity_edit,null);
final AlertDialog.Builder builder=new AlertDialog.Builder(CartActivity.this).setView(view);
update = (Button)view.findViewById(R.id.update);
quan=(TextView)view.findViewById(R.id.quan);
minusd=(ImageButton)view.findViewById(R.id.minus);
plusd=(ImageButton)view.findViewById(R.id.plus);
alertDialog=builder.create();
title1=(TextView)view.findViewById(R.id.TitleView);
title1.setText(cartItemList.get(position).getName());
personalise=(EditText)view.findViewById(R.id.editpersonalize);
personalise.setText(cartItemList.get(position).getPersonalize());
quan.setText(cartItemList.get(position).getQunatity());
image=(ImageView)view.findViewById(R.id.image1);
//imageLoader.DisplayImage(Bitmap.get);
final int num=Integer.parseInt(quan.getText().toString());
final int[] counter = {num};
plusd.setOnClickListener(new View.OnClickListener() {
//int counter=0;
#Override
public void onClick(View v) {
//Toast.makeText(CartActivity.this, "Positive is click", Toast.LENGTH_SHORT).show();
counter[0]++;
quan.setText(""+ counter[0]);
minusd.setClickable(true);
plusd.setClickable(true);
if(counter[0] ==10){
plusd.setClickable(false);
minusd.setClickable(true);
Toast.makeText(CartActivity.this, "it's maxium limit", Toast.LENGTH_SHORT).show();
}
//Toast.makeText(SingleItem_Activity.this, "it's maxium limit", Toast.LENGTH_SHORT).show();
if(counter[0] >=10) {
plusd.setClickable(false);
minusd.setClickable(true);
Toast.makeText(CartActivity.this, "it's maxium limit", Toast.LENGTH_SHORT).show();
}
}
});
minusd.setOnClickListener(new View.OnClickListener() {
// int counter=0;
#Override
public void onClick(View v) {
if(counter[0] ==1) {
minusd.setClickable(false);
}
else{
counter[0] = counter[0] -1;
quan.setText(""+ counter[0]);
if(counter[0] <=1){
minusd.setClickable(false);
plusd.setClickable(true);}
}
}
});
update.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String update_quan=quan.getText().toString();
String update_personalise = personalise.getText().toString();
updateCartItem(update_quan,cartItem.getPid(),update_personalise);
//Toast.makeText(CartActivity.this, "it's maxium limit", Toast.LENGTH_SHORT).show();
alertDialog.dismiss();
}
});
alertDialog.show();
}
});
cartRowHolder.txttitle.setText(cartItem.getName());
cartRowHolder.txtprice.setText(cartItem.getSubtotal());
cartRowHolder.txtquantity.setText(cartItem.getQunatity());
cartRowHolder.personalize.setText(cartItem.getPersonalize());
imageLoader.DisplayImage(cartItem.getImage(), cartRowHolder.icon);
}
return convertView;
}

OK, you will need to following code:
1) add permission for internet in your manifest
<uses-permission android:name="android.permission.INTERNET" />
2) You will need to update your list adapter
private static final int MIN_RECORDS_NUMBER = 11;
private Context _con;
private List<Person> _data;
public PersonAdapter(Context context, List<Person> data)
{
_con = context;
_data = data;
}
#Override
public int getCount()
{
return _data.size();
}
#Override
public Person getItem(int position)
{
return _data.get(position);
}
#Override
public long getItemId(int position)
{
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent)
{
Holder h = null;
if (convertView == null)
{
h = new Holder();
convertView = LayoutInflater.from(_con).inflate(R.layout.item_layout, parent, false);
h._backgroundItem = (LinearLayout) convertView.findViewById(R.id.item_layout);
h._fName = (TextView) convertView.findViewById(R.id.f_name);
h._lName = (TextView) convertView.findViewById(R.id.l_name);
h._age = (TextView) convertView.findViewById(R.id.age);
h._editBtn = (Button) convertView.findViewById(R.id.edit_btn);
convertView.setTag(h);
}
else
{
h = (Holder) convertView.getTag();
}
final Person p = getItem(position);
h._fName.setText(p._fName);
h._lName.setText(p._lName);
h._age.setText(String.valueOf(p._age));
h._backgroundItem.setActivated(p._selected);
h._editBtn.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
((MainActivity)_con).onEditClick(p._url);
}
});
convertView.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
Person p = getItem(position);
Intent i = new Intent(_con,SecondActivity.class);
i.putExtra("DATA", p._fName);
_con.startActivity(i);
}
});
return convertView;
}
public void setData(List<Person> data)
{
_data = data;
notifyDataSetChanged();
}
private static class Holder
{
public LinearLayout _backgroundItem;
public TextView _fName;
public TextView _lName;
public TextView _age;
public Button _editBtn;
}
public interface IDialog
{
public void onEditClick(String url);
}
3) update your mainactivity
public class MainActivity extends Activity implements IDialog
{
private ListView _listView;
private PersonAdapter _adapter;
private Button _sortBtn;
private List<Person> _data;
private int _sort;
private int _selectedItemIndex;
private Bitmap _bit;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
_listView = (ListView) findViewById(R.id.list);
_sortBtn = (Button) findViewById(R.id.sort_list_btn);
_selectedItemIndex = -1;
_sort = 1;
_data = new ArrayList<Person>();
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160503230552-sanders-clinton-trump-triple-composite-mullery-medium-tease.jpg","abc", "defg", 1));
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160503230552-sanders-clinton-trump-triple-composite-mullery-medium-tease.jpg","aaa", "defg", 12));
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160503230552-sanders-clinton-trump-triple-composite-mullery-medium-tease.jpg","ccc", "defg", 13));
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160511120611-bud-america-medium-tease.jpg","bb", "defg", 14));
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160511120611-bud-america-medium-tease.jpg","aa", "defg", 144));
_data.add(new Person("http://i2.cdn.turner.com/cnnnext/dam/assets/160511120611-bud-america-medium-tease.jpg","fff", "defg", 199));
_adapter = new PersonAdapter(this, _data);
_listView.setAdapter(_adapter);
_listView.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
if(position<_data.size())
{
if(_selectedItemIndex>-1)
{
_data.get(_selectedItemIndex)._selected = false;
}
_selectedItemIndex = position;
_data.get(position)._selected = true;
_adapter.setData(_data);
}
}
});
_sortBtn.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
if(_selectedItemIndex>-1)
{
_listView.clearChoices();
String fName = _adapter.getItem(_selectedItemIndex)._fName;
Comparator<Person> sortById = Person.getComperatorByFirstName(_sort);
Collections.sort(_data, sortById);
int newSelectedItemIndex = getSelectedItemIndexByFName(fName);
_selectedItemIndex = newSelectedItemIndex;
_adapter.setData(_data);
if(newSelectedItemIndex>-1)
{
_listView.setItemChecked(newSelectedItemIndex, true);
}
_sort = -_sort;
}
else
{
Comparator<Person> sortById = Person.getComperatorByFirstName(_sort);
Collections.sort(_data, sortById);
_adapter.setData(_data);
_sort = -_sort;
}
}
});
}
private int getSelectedItemIndexByFName(String name)
{
for(int index=0;index<_data.size();index++)
{
if(_data.get(index)._fName.equals(name))
{
return index;
}
}
return -1;
}
public static class Person
{
public String _url;
public String _fName;
public String _lName;
public int _age;
public boolean _selected;
public Person(String url,String fName, String lName, int age)
{
_url = url;
_fName = fName;
_lName = lName;
_age = age;
}
public static Comparator<Person> getComperatorByFirstName(final int ascendingFlag)
{
return new Comparator<Person>()
{
#Override
public int compare(Person patient1, Person patient2)
{
return patient1._fName.compareTo(patient2._fName) * ascendingFlag;
}
};
}
}
public Bitmap getBitmapFromURL(String src) {
try
{
URL url = new URL(src);
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setInstanceFollowRedirects(true);
Bitmap image = BitmapFactory.decodeStream(httpCon.getInputStream());
return image;
}
catch (MalformedURLException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
public void onEditClick(final String url)
{
new Thread(new Runnable()
{
#Override
public void run()
{
_bit = getBitmapFromURL(url);
runOnUiThread(new Runnable()
{
#Override
public void run()
{
Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.custom_image);
ImageView image = (ImageView) dialog.findViewById(R.id.image);
if(_bit!=null)
{
image.setImageBitmap(_bit);
}
dialog.setTitle("This is my custom dialog box");
dialog.setCancelable(true);
//there are a lot of settings, for dialog, check them all out!
dialog.show();
}
});
}
}).start();
}
4) custom image layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/image"/>
</LinearLayout>
A bit of explanation:
there is an interface between the activity and the list adapter (IDialog)
as part of the data, each item(person) has a field URL, when the user is clicking on the button, the activity is "notified" by the interface and downloading the appropriate image and showing it in the dialog

After so any hour I find out the Soloution. Now In the Dialog-box i can again download the image.....
imageFileURL="url";
String imageFileURL=cartItemList.get(position).getImage();
try {
URL url = new URL(imageFileURL);
URLConnection conn = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection)conn;
httpConn.connect();
InputStream inputStream = httpConn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
inputStream.close();
image.setImageBitmap(bitmap);
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

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.

Listview with filter

i am trying to filter the listview using edit text at the top but it providing null pointer exception in the adapter2.filter(text) of add text changed listener . please provide me some suggestion`
Here is my edit text`
friendsList.setAdapter(new FriendListAdapter(this));
search.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = search.getText().toString().toLowerCase(Locale.getDefault());
System.out.println("test=="+text);
adapter2.filter(text);
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
//adapter.getFilter().filter(arg0.toString());
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
Here is my adapter
public class FriendListAdapter extends BaseAdapter {
private LayoutInflater mInflater;
FriendsList friendsList;
Context context;
ViewHolder holder;
private boolean userSelected = false;
private RadioButton mCurrentlyCheckedRB;
private int mResourceId = 0;
private LayoutInflater mLayoutInflater;
private RadioButton mSelectedRB;
private int mSelectedPosition = -1;
public FriendListAdapter(FriendsList friendsList) {
this.friendsList = friendsList;
if (Utility.model == null) {
Utility.model = new FriendsGetProfilePics();
}
Utility.model.setListener(this);
mInflater = LayoutInflater.from(friendsList.getBaseContext());
}
#Override
public int getCount() {
return jsonArray.length();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int arg0) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup viewgroup) {
JSONObject jsonObject = null;
Model model = (Model) getItem(position);
try {
jsonObject = jsonArray.getJSONObject(position);
} catch (JSONException e1) {
e1.printStackTrace();
}
View hView = convertView;
if (convertView == null) {
hView = mInflater.inflate(R.layout.friend_item, null);
ViewHolder holder = new ViewHolder();
holder.profile_pic = (ImageView) hView
.findViewById(R.id.profile_pic);
holder.name = (TextView) hView.findViewById(R.id.name);
holder.info = (TextView) hView.findViewById(R.id.info);
holder.radiobt = (RadioButton) hView.findViewById(R.id.radio);
hView.setTag(holder);
}
ViewHolder holder = (ViewHolder) hView.getTag();
if (position == getCount() - 1 && userSelected == false) {
holder.radiobt.setChecked(true);
mCurrentlyCheckedRB = holder.radiobt;
} else {
holder.radiobt.setChecked(false);
}
holder.radiobt.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if((position != mSelectedPosition && mSelectedRB != null)){
mSelectedRB.setChecked(false);
}
mSelectedPosition = position;
mSelectedRB = (RadioButton)v;
System.out.println("onItemClick ");
try {
if (graph_or_fql.equals("graph")) {
System.out.println("in if loop ");
friendId = jsonArray.getJSONObject(position).getLong("id");
image = jsonArray.getJSONObject(position).getString("picture");
// sb.append(friendId).append(",");
freind_id = String.valueOf(friendId);
} else {
System.out.println("in else loop ");
friendId = jsonArray.getJSONObject(position).getLong("uid");
image = jsonArray.getJSONObject(position).getString(
"pic_square");
// sb.append(friendId).append(",");
freind_id = String.valueOf(friendId);
}
check = true;
name = jsonArray.getJSONObject(position).getString("name");
Toast.makeText(getApplicationContext(), "You Selected : " + name,
Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
e.printStackTrace();
e.getMessage();
}
}
});
if(mSelectedPosition != position){
holder.radiobt.setChecked(false);
}else{
holder.radiobt.setChecked(true);
if(mSelectedRB != null && holder.radiobt != mSelectedRB){
mSelectedRB = holder.radiobt;
}
}
try {
if (graph_or_fql.equals("graph")) {
holder.profile_pic.setImageBitmap(Utility.model.getImage(
jsonObject.getString("id"),
jsonObject.getString("picture")));
} else {
holder.profile_pic.setImageBitmap(Utility.model.getImage(
jsonObject.getString("uid"),
jsonObject.getString("pic_square")));
}
} catch (JSONException e) {
holder.name.setText("");
}
try {
holder.name.setText(jsonObject.getString("name"));
} catch (JSONException e) {
holder.name.setText("");
}
try {
if (graph_or_fql.equals("graph")) {
holder.info.setText(jsonObject.getJSONObject("location")
.getString("name"));
} else {
JSONObject location = jsonObject
.getJSONObject("current_location");
holder.info.setText(location.getString("city") + ", "
+ location.getString("state"));
}
} catch (JSONException e) {
holder.info.setText("");
}
return hView;
}
// Filter Class
public void filter(String charText) {
System.out.println("in adapter filter");
charText = charText.toLowerCase(Locale.getDefault());
System.out.println("1");
rowitems.clear();
System.out.println("2");
if (charText.length() == 0) {
System.out.println("3");
rowitems.addAll(listData);
} else {
for (Model wp : listData) {
if (wp.getName().toLowerCase(Locale.getDefault())
.contains(charText)) {
rowitems.add(wp);
}
}
}
notifyDataSetChanged();
}
private class ViewHolder {
ImageView profile_pic;
TextView name;
TextView info;
// CheckBox check;
RadioButton radiobt;
}
}
Here is my main activity
public class FriendsList extends Activity implements OnItemClickListener{
private Handler mHandler;
public static Long friendId;
public static String name = "";
protected ListView friendsList;
protected static JSONArray jsonArray;
protected String graph_or_fql;
public Button bt;
public static String image = "0";
public boolean check = false;
public static String freind_id = "";
public boolean select = false;
public RadioButton radiobtn;
public ListView friendList;
private List<Model> rowitems=null;
ArrayList<Model> listData;
AdapterList adapter;
EditText search;
FriendListAdapter adapter2;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mHandler = new Handler();
setContentView(R.layout.friends_list);
//radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
bt = (Button) findViewById(R.id.com_facebook_picker_done_button);
radiobtn = (RadioButton) findViewById(R.id.radio);
search=(EditText) findViewById(R.id.editText100);
Bundle extras = getIntent().getExtras();
String apiResponse = extras.getString("API_RESPONSE");
graph_or_fql = extras.getString("METHOD");
try {
if (graph_or_fql.equals("graph")) {
jsonArray = new JSONObject(apiResponse).getJSONArray("data");
} else {
jsonArray = new JSONArray(apiResponse);
}
} catch (JSONException e) {
e.printStackTrace();
e.getMessage();
return;
}
friendsList = (ListView) findViewById(R.id.friends_list);
// friendsList.setAdapter(new FriendListAdapter(this));
adapter2=new FriendListAdapter(this);
friendsList.setAdapter(adapter2);
friendsList.setOnItemClickListener(this);
search.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
adapter2.getFilter().filter(arg0.toString());
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
i am passing the facebook friend list to the listview.please provide some suggestion
Thanks in advance

For filter the listview using edit text at the top .
I used this code.
Make one list called searchResults than in onTextChanged method of edittext simply do this-
String searchString = `your edittext object`.getText().toString();
int textLength = searchString.length();
searchResults.clear();
for (int i = 0; i < `your main list of items`.size(); i++) {
String name = `your main list of items`.get(i).get("`your key`").toString();
System.out.println(" name " + name);
if (textLength <= title.length()) {
// compare the String in EditText with Names in the
// ArrayList
if (searchString.equalsIgnoreCase(name.substring(0, textLength))) {
searchResults.add(`your main list of items`.get(i));
System.out.println("the array list is "+ `your main list of items`.get(i));
mAdapter = new Adapter(this, searchResults);
`your ListView object`.setAdapter(mAdapter);
}
}
}
if (searchResults.isEmpty()) {
Toast toast = Toast.makeText(getApplicationContext(),"No Items Matched",Toast.LENGTH_SHORT);
toast.show();
mAdapter = new Adapter(this, searchResults);
`your ListView object`.setAdapter(mAdapter);
}
mAdapter.notifyDataSetChanged();
and on setOnItemClickListener just check searchResults.isEmpty() if true than use your your main list of items and if false than use searchResults list.
May be it will help you.try this.

change your filter with following code:
#Override
public Filter getFilter() {
//Log.d("in filter", "yes");
return new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults oReturn = new FilterResults();
and set your list in this function and after set your list :
oReturn.values = YourList;
and finall
return oReturn;
and in Your search.addTextChangedListener(new TextWatcher()) just in onTextChanged add following line:
adapter2.getFilter().filter(s.toString());

Try this,
adapter2=new FriendListAdapter(this);
friendsList.setAdapter(adapter2);

Issue with Record holder custom adapter

I have listAdapter of listview and I have set record button in custom adapter. I have put code inside click event of holder.record like
holder.record.setBackgroundResource(R.drawable.record_green);
for set background of that button while user touch.but my problem is when I touch particular list item button this images are apply in another list item
Here are code:
holder.record.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (isplaying2 == true) {
} else
{
if (b_Flag_Record_or_not == true) {
} else {
try {
holder.record.setBackgroundResource(R.drawable.record_green);
b_Flag_Record_or_not = true;
b_play_or_not = true;
flag_stop_position = position;
AuthHandler dataHandler = new AuthHandler();
AuthDataset dataset = dataHandler
.getParsednewJobdtl_DataSet();
System.out.println("dataset.getint1();"
+ dataset.getint1());
// Login l = new Login();
String str_useid = RequestTo[position];
recorder = new AudioRecorder("/audiometer/shanesh"
+ RequestId[position] + "-" + str_useid);
start_or_not = true;
recorder.start();
Toast.makeText(context, "Start Recording", Toast.LENGTH_LONG).show();
CountDownTimer countDowntimer = new CountDownTimer(
120000000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
try {
Toast.makeText(
context,
"Stop recording Automatically ",
Toast.LENGTH_LONG).show();
recorder.stop();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
countDowntimer.start();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
}catch (Exception e) {
}
}
}
}
});
Update:
public class ListViewAdapter extends BaseAdapter {
public static Activity context;
String title[];
String description[];
String RequestId[];
String Folderpath[];
String RequestTo[];
boolean b_Flag_Record_or_not = false;
boolean b_upload_or_not = false;
boolean start_or_not = false;
boolean start_play = false;
boolean upload_or_not = false;
boolean b_play_or_not = false;
boolean isplaying2 = false;
Thread welcomeThread;
int glob_position;
MediaPlayer mPlayer2;
int flag_stop_position;
AudioRecorder recorder;
AnimationDrawable frameAnimation, frameAnimation_play;
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
Recording login = new Recording();
ViewHolder holder;
MediaPlayer MP_completeRequest = new MediaPlayer();
public ListViewAdapter(Activity context, String[] title,
String[] description, String[] req_id, String[] FolderPath,
String[] Arr_RequestTo) {
super();
this.context = context;
this.title = title;
this.description = description;
this.RequestId = req_id;
this.Folderpath = FolderPath;
this.RequestTo = Arr_RequestTo;
}
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewDescription;
Button record, stop, play, upload;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = context.getLayoutInflater();
glob_position = position;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView
.findViewById(R.id.textView1);
holder.txtViewDescription = (TextView) convertView
.findViewById(R.id.textView2);
holder.record = (Button) convertView.findViewById(R.id.record);
holder.stop = (Button) convertView.findViewById(R.id.stop);
holder.play = (Button) convertView.findViewById(R.id.play1);
holder.upload = (Button) convertView
.findViewById(R.id.audio_upload);
/* set button image */
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
Typeface face = Typeface.createFromAsset(context.getAssets(),
"fonts/tahoma.ttf");
holder.txtViewTitle.setTypeface(face);
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}

Please see Holder is used to reuse views in adapterview, so if a Screen can displays 5 items once, 6th item will reuse item no 1's View, hence holder.
Use ListView.onItemClickListener instead of holder.record.setOnClickListener(), or set background of view into getView method, I am editing your code in getVIew method:
public class ListViewAdapter extends BaseAdapter {
public static Activity context;
String title[];
String description[];
String RequestId[];
String Folderpath[];
String RequestTo[];
boolean b_Flag_Record_or_not = false;
boolean b_upload_or_not = false;
boolean start_or_not = false;
boolean start_play = false;
boolean upload_or_not = false;
boolean b_play_or_not = false;
boolean isplaying2 = false;
Thread welcomeThread;
int glob_position;
MediaPlayer mPlayer2;
int flag_stop_position;
AudioRecorder recorder;
AnimationDrawable frameAnimation, frameAnimation_play;
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
Recording login = new Recording();
ViewHolder holder;
MediaPlayer MP_completeRequest = new MediaPlayer();
public ListViewAdapter(Activity context, String[] title,
String[] description, String[] req_id, String[] FolderPath,
String[] Arr_RequestTo) {
super();
this.context = context;
this.title = title;
this.description = description;
this.RequestId = req_id;
this.Folderpath = FolderPath;
this.RequestTo = Arr_RequestTo;
}
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewDescription;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = context.getLayoutInflater();
glob_position = position;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView
.findViewById(R.id.textView1);
holder.txtViewDescription = (TextView) convertView
.findViewById(R.id.textView2);
/* set button image */
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
Typeface face = Typeface.createFromAsset(context.getAssets(),
"fonts/tahoma.ttf");
holder.txtViewTitle.setTypeface(face);
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
Button record = (Button) convertView.findViewById(R.id.record);
Button stop = (Button) convertView.findViewById(R.id.stop);
Button play = (Button) convertView.findViewById(R.id.play1);
Button upload = (Button) convertView
.findViewById(R.id.audio_upload);
record.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (isplaying2 == true) {
} else
{
if (b_Flag_Record_or_not == true) {
} else {
try {
record.setBackgroundResource(R.drawable.record_green);
b_Flag_Record_or_not = true;
b_play_or_not = true;
flag_stop_position = position;
AuthHandler dataHandler = new AuthHandler();
AuthDataset dataset = dataHandler
.getParsednewJobdtl_DataSet();
System.out.println("dataset.getint1();"
+ dataset.getint1());
// Login l = new Login();
String str_useid = RequestTo[position];
recorder = new AudioRecorder("/audiometer/shanesh"
+ RequestId[position] + "-" + str_useid);
start_or_not = true;
recorder.start();
Toast.makeText(context, "Start Recording", Toast.LENGTH_LONG).show();
CountDownTimer countDowntimer = new CountDownTimer(
120000000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
try {
Toast.makeText(
context,
"Stop recording Automatically ",
Toast.LENGTH_LONG).show();
recorder.stop();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
countDowntimer.start();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
}catch (Exception e) {
}
}
}
}
});