List View Filter Android

Question

I have created a list view in android and I want to add edit text above the list and when the user enter text the list will be filtered according to user input  can anyone tell me please if there is a way to filter the list adapter in android

User · Answer

Implement your adapter Filterable   public class vJournalAdapter extends ArrayAdapter lt JournalModel gt  implements Filterable  private ArrayList lt JournalModel gt  items  private Context mContext         then create your Filter class   private class JournalFilter extends Filter        Override     protected FilterResults performFiltering CharSequence constraint            FilterResults result   new FilterResults            List lt JournalModel gt  allJournals   getAllJournals            if constraint    null    constraint length      0                result values   allJournals              result count   allJournals size             else              ArrayList lt JournalModel gt  filteredList   new ArrayList lt JournalModel gt                 for JournalModel j  allJournals                   if j source title contains constraint                       filteredList add j                             result values   filteredList              result count   filteredList size                       return result             SuppressWarnings  unchecked        Override     protected void publishResults CharSequence constraint  FilterResults results            if  results count    0                notifyDataSetInvalidated              else               items    ArrayList lt JournalModel gt   results values              notifyDataSetChanged                         this way  your adapter is Filterable  you can pass filter item to adapter s filter and do the   work  I hope this will be helpful

User · Answer

In case anyone are still interested in this subject  I find that the best approach for filtering lists is to create a generic Filter class and use it with some base reflection generics techniques contained in the Java old school SDK package  Here s what I did   public class GenericListFilter lt T gt  extends Filter                   Copycat constructor         param list  the original list to be used             public GenericListFilter  List lt T gt  list  String reflectMethodName  ArrayAdapter lt T gt  adapter            super              mInternalList   new ArrayList lt  gt  list           mAdapterUsed    adapter           try               ParameterizedType stringListType    ParameterizedType                      getClass   getField  mInternalList   getGenericType                mCompairMethod                       stringListType getActualTypeArguments   0  getClass   getMethod reflectMethodName                     catch  Exception ex                Log w  GenericListFilter   ex getMessage    ex                try                   if  mInternalList size    gt  0                        T type   mInternalList get 0                       mCompairMethod   type getClass   getMethod reflectMethodName                                               catch  Exception e                    Log e  GenericListFilter   e getMessage    e                                                  Let s filter the data with the given constraint         param constraint         return              Override protected FilterResults performFiltering CharSequence constraint            FilterResults results   new FilterResults            List lt T gt  filteredContents   new ArrayList lt  gt              if   constraint length    gt  0                 try                   for  T obj   mInternalList                        String result    String  mCompairMethod invoke obj                       if  result toLowerCase   startsWith constraint toString   toLowerCase                               filteredContents add obj                                                                     catch  Exception ex                    Log e  GenericListFilter   ex getMessage    ex                                   else               filteredContents addAll mInternalList                      results values   filteredContents          results count    filteredContents size            return results                        Publish the filtering adapter list         param constraint         param results              Override protected void publishResults CharSequence constraint  FilterResults results            mAdapterUsed clear            mAdapterUsed addAll  List lt T gt   results values            if   results count    0                 mAdapterUsed notifyDataSetInvalidated                      else               mAdapterUsed notifyDataSetChanged                            class properties     private ArrayAdapter lt T gt  mAdapterUsed      private List lt T gt  mInternalList      private Method  mCompairMethod      And afterwards  the only thing you need to do is to create the filter as a member class  possibly within the View s  onCreate   passing your adapter reference  your list  and the method to be called for filtering   this mFilter   new GenericFilter lt MyObjectBean gt   list   getName   adapter     The only thing missing now  is to override the  getFilter  method in the adapter class    Override public Filter getFilter           return MyViewClass this mFilter      All done  You should successfully filter your list - Of course  you should also implement your filter algorithm the best way that describes your need  the code bellow is just an example   Hope it helped  take care

User · Answer

Add an EditText on top of your listview in its  xml layout file  And in your activity fragment    lv    ListView  findViewById R id list view       inputSearch    EditText  findViewById R id inputSearch       Adding items to listview adapter   new ArrayAdapter lt String gt  this  R layout list item  R id product name     products   lv setAdapter adapter          inputSearch addTextChangedListener new TextWatcher           Override     public void onTextChanged CharSequence cs  int arg1  int arg2  int arg3               When user changed the Text         MainActivity this adapter getFilter   filter cs               Override     public void beforeTextChanged CharSequence arg0  int arg1  int arg2  int arg3            Override     public void afterTextChanged Editable arg0           The basic here is to add an OnTextChangeListener to your edit text and inside its callback method apply filter to your listview s adapter   EDIT  To get filter to your custom BaseAdapter you ll need to implement Filterable interface   class CustomAdapter extends BaseAdapter implements Filterable        public View getView                      public Integer getCount                             Override     public Filter getFilter              Filter filter   new Filter                   SuppressWarnings  unchecked                Override             protected void publishResults CharSequence constraint  FilterResults results                     arrayListNames    List lt String gt   results values                  notifyDataSetChanged                                Override             protected FilterResults performFiltering CharSequence constraint                     FilterResults results   new FilterResults                    ArrayList lt String gt  FilteredArrayNames   new ArrayList lt String gt                         perform your search here using the searchConstraint String                   constraint   constraint toString   toLowerCase                    for  int i   0  i  lt  mDatabaseOfNames size    i                          String dataNames   mDatabaseOfNames get i                       if  dataNames toLowerCase   startsWith constraint toString                                FilteredArrayNames add dataNames                                                            results count   FilteredArrayNames size                    results values   FilteredArrayNames                  Log e  VALUES   results values toString                      return results                                    return filter            Inside performFiltering   you need to do actual comparison of the search query to values in your database  It will pass its result to  publishResults   method

[android] List View Filter Android

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