Autocompletetextview with custom adapter and filter

Question

I am trying to set a custom ArrayAdapter for my AutoCompleteTextView like this

public class AutoCompleteContactArrayAdapter extends
    ArrayAdapter<Map<String, String>> implements Filterable {
private Context mContext;
private List<Map<String, String>> mContactList;

public AutoCompleteContactArrayAdapter(Context context,
        List<Map<String, String>> objects) {
    super(context, R.layout.auto_contact_list, objects);
    mContext = context;
    mContactList = objects;
    // TODO Auto-generated constructor stub
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) mContext
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.auto_contact_list, parent,
            false);
    TextView nameView = (TextView) rowView.findViewById(R.id.ccontName);
    TextView phoneView = (TextView) rowView.findViewById(R.id.ccontNo);
    TextView typeView = (TextView) rowView.findViewById(R.id.ccontType);
    Map<String, String> contactMap = mContactList.get(position);

    nameView.setText(contactMap.get("name"));
    phoneView.setText(contactMap.get("phone"));
    typeView.setText(contactMap.get("type"));

    return rowView;
}
@Override
public Filter getFilter() {
    return new Filter() {
        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {

            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            ArrayList<String> result = new ArrayList<String>();
            result.add("test");
            result.add("another");
            result.add("last");
            FilterResults r = new FilterResults();
            r.values = result;
            r.count = result.size();
            return r;
        }
    };
}
}

In debug the application is entering the filter methods both publishResults() and performFiltering() but the result set that is being displayed is not my test array [test,another,last] instead it just shows all the results ignoring my filter.

Answer 1

Here is the current implementation of my code:

The xml

<AutoCompleteTextView
    android:id="@+id/searchAutoComplete"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:layout_marginRight="10dp"
    android:layout_toRightOf="@+id/linearLayout1"
    android:background="@drawable/abs__textfield_search_default_holo_light"
    android:drawableLeft="@drawable/abs__ic_search_api_holo_light"
    android:drawableRight="@drawable/abs__ic_clear_holo_light"
    android:hint="@string/search"
    android:imeOptions="actionSearch"
    android:inputType="textAutoComplete|textAutoCorrect" >

The adapter:

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;

public class AutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {

    private ArrayList<String> fullList;
    private ArrayList<String> mOriginalValues;
    private ArrayFilter mFilter;

    public AutoCompleteAdapter(Context context, int resource, int textViewResourceId, List<String> objects) {

        super(context, resource, textViewResourceId, objects);
        fullList = (ArrayList<String>) objects;
        mOriginalValues = new ArrayList<String>(fullList);

    }

    @Override
    public int getCount() {
        return fullList.size();
    }

    @Override
    public String getItem(int position) {
        return fullList.get(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        return super.getView(position, convertView, parent);
    }

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }


    private class ArrayFilter extends Filter {
        private Object lock;

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            if (mOriginalValues == null) {
                synchronized (lock) {
                    mOriginalValues = new ArrayList<String>(fullList);
                }
            }

            if (prefix == null || prefix.length() == 0) {
                synchronized (lock) {
                    ArrayList<String> list = new ArrayList<String>(mOriginalValues);
                    results.values = list;
                    results.count = list.size();
                }
            } else {
                final String prefixString = prefix.toString().toLowerCase();

                ArrayList<String> values = mOriginalValues;
                int count = values.size();

                ArrayList<String> newValues = new ArrayList<String>(count);

                for (int i = 0; i < count; i++) {
                    String item = values.get(i);
                    if (item.toLowerCase().contains(prefixString)) {
                        newValues.add(item);
                    }

                }

                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {

        if(results.values!=null){
        fullList = (ArrayList<String>) results.values;
        }else{
            fullList = new ArrayList<String>();
        }
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}

And finally in code initialize like this...

       ArrayList<String> searchArrayList= new ArrayList<String>();
//initilaze this array with your data
        AutoCompleteAdapter adapter = new AutoCompleteAdapter(this, android.R.layout.simple_dropdown_item_1line, android.R.id.text1, searchArrayList);
        autoCompleteTextView = (AutoCompleteTextView) customNav.findViewById(R.id.searchAutoComplete);
        autoCompleteTextView.setAdapter(adapter);

Done :)

Answer 2

Okay i think i figure out what Luksprog was saying this code works now they key is this

mContactList = (ArrayList<Map<String, String>>) results.values;

in

@Override
public int getCount(){
    return mContactList.size();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) mContext
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.auto_contact_list, parent,
            false);
    TextView nameView = (TextView) rowView.findViewById(R.id.ccontName);
    TextView phoneView = (TextView) rowView.findViewById(R.id.ccontNo);
    TextView typeView = (TextView) rowView.findViewById(R.id.ccontType);
    Map<String, String> contactMap = mContactList.get(position);

    nameView.setText(contactMap.get("name"));
    phoneView.setText(contactMap.get("phone"));
    typeView.setText(contactMap.get("type"));

    return rowView;
}
@Override
public Filter getFilter() {
    return new Filter() {
        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {

            if (results.count > 0) {
                mContactList = (ArrayList<Map<String, String>>) results.values;
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            ArrayList<Map<String, String>> result = new ArrayList<Map<String, String>>();
            HashMap<String,String> myMap = new HashMap<String,String>();
            myMap.put("name", "key");
            result.add(myMap);
            HashMap<String,String> myMap2 = new HashMap<String,String>();
            myMap2.put("name", "is");
            result.add(myMap2);
            HashMap<String,String> myMap3 = new HashMap<String,String>();
            myMap3.put("name", "another");
            result.add(myMap3);
            FilterResults r = new FilterResults();
            r.values = result;
            r.count = result.size();
            return r;
        }
    };
}