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 ?

Answer 1

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.

Answer 2

Implement your adapter Filterable:

public class vJournalAdapter extends ArrayAdapter<JournalModel> implements Filterable{ private ArrayList<JournalModel> 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<JournalModel> allJournals = getAllJournals();         if(constraint == null || constraint.length() == 0){              result.values = allJournals;             result.count = allJournals.size();         }else{             ArrayList<JournalModel> filteredList = new ArrayList<JournalModel>();             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<JournalModel>) 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.