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 · Accepted 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<String>(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<String>) results.values;
                notifyDataSetChanged();
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {

                FilterResults results = new FilterResults();
                ArrayList<String> FilteredArrayNames = new ArrayList<String>();

                // perform your search here using the searchConstraint String.

                constraint = constraint.toString().toLowerCase();
                for (int i = 0; i < 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.

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

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

[android] List View Filter Android

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