Peppe
Reputation: 41
Android EditText search while typing in ListView fast delete issue
I have a problem with my code, I perform a search into a HashMap inside an Adapter. It works fine but when I delete quickly all letters in EditText so the Adapter show the list of the first entire string typed and not the list of all elements.
Example: I type James, the view get all the James in the Map, but if I delete quickly the EditText (pressing back) so the method perform the search right back and show the correct list for any substring (jame, jam, ja, j) but at the end he shows again the list inherited "James" and not the full contact list
Thank you for any answers!
public class ContactsActivity extends ListActivity {
private HashMap<String, UserEntry> all_map_jid=new HashMap<String, UserEntry>();
private ArrayList<String> all_mkey=new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contacts);
getListView().setTextFilterEnabled(true);
final EditText searchText = (EditText) findViewById(R.id.searchbox);
TextWatcher textWatcher = new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//... your logic
adapter.getFilter().filter(s.toString());
}
@Override
public void afterTextChanged(Editable arg0) {
// ... your logic
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// ... your logic
}
};
searchText.addTextChangedListener(textWatcher);}
public class RosterAdapter extends BaseAdapter implements Filterable{
//private ViewHolder holder;
private LayoutInflater inflater;
private HashMap<String, UserEntry> mappa_users=null;
private ArrayList<String> mKeys;
public RosterAdapter(){
this.mappa_users =new HashMap<String, UserEntry>();
this.inflater= (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mKeys=new ArrayList<String>();
}
@Override
public int getCount() {
return mappa_users.size();
}
@Override
public UserEntry getItem(int position) {
return mappa_users.get(mKeys.get(position));
}
@Override
public long getItemId(int arg0) {
return arg0;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.layout_row, null);
// Creates a ViewHolder and store references to the two children
// views we want to bind data to.
holder = new ViewHolder();
holder.username = (TextView) convertView.findViewById(R.id.user_info);
holder.availability = (ImageView) convertView.findViewById(R.id.user_availability);
holder.user_ic = (ImageView) convertView.findViewById(R.id.icon);
// Keep track of the view holder as a tag of the view
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
String user = getItem(position).getUserName();
//Log.e("Nome","username "+user);
holder.username.setText(user);
if(!(getItem(position).getUserStatus())){
System.out.println("unavailable");
holder.availability.setImageResource(R.drawable.ic_not_available);
}else{
holder.availability.setImageResource(R.drawable.ic_available);
}
//do your view stuff here
return convertView;
}
@Override
public Filter getFilter() {
return new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
mappa_users = (HashMap<String,UserEntry>) results.values;
mKeys= new ArrayList<String>(Arrays.asList(mappa_users.keySet().toArray(new String[mappa_users.size()])));
Collections.sort(mKeys, new RosterEntryComparator(mappa_users));
notifyDataSetChanged();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
HashMap<String,UserEntry> searched_user=new HashMap<String,UserEntry>();
FilterResults results = new FilterResults();
if (constraint!= null && constraint.toString().length() > 0) {
SmithWaterman metric = new SmithWaterman();
for(String element : all_mkey){
//La mappa dell'adapter è riempito con le sole entry simily all'occorrenza ricercata
if (metric.getSimilarity(constraint.toString().toLowerCase(), all_map_jid.get(element).getUserName().toLowerCase()) >= 0.8 ){
UserEntry rEntry=all_map_jid.get(element);
searched_user.put(element, rEntry );
}
}
results.values = searched_user;
results.count = searched_user.size();
}
else{
results.values = all_map_jid;
results.count = all_map_jid.size();
}
return results;
}
};
}
Upvotes: 1
Views: 2763
Answers (1)
Peppe
Reputation: 41
Solved
I solved the issue, the problem was that I created a new Filter object on any new typing, using the same Filter all works well, because as is written in the android documentation:
public final void filter (CharSequence constraint, Filter.FilterListener listener)
Added in API level 1 Starts an asynchronous filtering operation. Calling this method cancels all previous non-executed filtering requests and posts a new filtering request that will be executed later.
This is the correct code:
//My Adapter
public class RosterAdapter extends BaseAdapter implements Filterable{
//private ViewHolder holder;
private LayoutInflater inflater;
private ItemsFilter mFilter;
private HashMap<String, UserEntry> mappa_users=null;
private HashMap<String, UserEntry> all_map_jid=null;
private ArrayList<String> all_mkey=null;;
private ArrayList<String> mKeys;
public RosterAdapter(){
this.mappa_users =new HashMap<String, UserEntry>();
this.inflater= (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.all_map_jid=new HashMap<String, UserEntry>();
this.all_mkey=new ArrayList<String>();
this.mKeys=new ArrayList<String>();
}
@Override
public int getCount() {
return mappa_users.size();
}
@Override
public UserEntry getItem(int position) {
return mappa_users.get(mKeys.get(position));
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.layout_row, null);
// Creates a ViewHolder and store references to the two children
// views we want to bind data to.
holder = new ViewHolder();
holder.username = (TextView) convertView.findViewById(R.id.user_info);
holder.availability = (ImageView) convertView.findViewById(R.id.user_availability);
holder.user_ic = (ImageView) convertView.findViewById(R.id.icon);
// Keep track of the view holder as a tag of the view
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
String user = getItem(position).getUserName();
//Log.e("Nome","username "+user);
holder.username.setText(user);
if(!(getItem(position).getUserStatus())){
holder.availability.setImageResource(R.drawable.ic_not_available);
}else{
holder.availability.setImageResource(R.drawable.ic_available);
}
//do your view stuff here
return convertView;
}
/**
* Implementing the Filterable interface.
*/
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemsFilter();
}
return mFilter;}
/**
* Custom Filter implementation for the items adapter.
*
*/
private class ItemsFilter extends Filter {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
adapter.mappa_users = (HashMap<String,UserEntry>) results.values;
adapter.mKeys= new ArrayList<String>(Arrays.asList(adapter.mappa_users.keySet().toArray(new String[adapter.mappa_users.size()])));
Collections.sort(mKeys, new RosterEntryComparator(adapter.mappa_users));
notifyDataSetChanged();
Log.e("fine", "Terminato filtraggio "+constraint);
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
HashMap<String,UserEntry> searched_user=new HashMap<String,UserEntry>();
FilterResults results = new FilterResults();
if (constraint!= null && constraint.toString().length() > 0) {
SmithWaterman metric = new SmithWaterman();
for(String element : all_mkey){
//La mappa dell'adapter è riempito con le sole entry simily all'occorrenza ricercata
if (metric.getSimilarity(constraint.toString().toLowerCase(), all_map_jid.get(element).getUserName().toLowerCase()) >= 0.8 ){
UserEntry rEntry=all_map_jid.get(element);
searched_user.put(element, rEntry );
}
}
results.values = searched_user;
results.count = searched_user.size();
}
else{
results.values = all_map_jid;
results.count = all_map_jid.size();
}
return results;
}
};
Upvotes: 3
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