Another Filter Demo

package com.tilleytech.android.myhealthylife; import java.util.ArrayList; import java.util.Iterator; import android.app.ListActivity;  import android.content.Context; import android.content.res.Resources; import android.os.Bundle; import android.text.Editable;  import android.text.TextWatcher;  import android.view.LayoutInflater;    import android.view.View;   import android.view.ViewGroup;   import android.widget.ArrayAdapter;   import android.widget.EditText;   import android.widget.Filter;   import android.widget.ListView;   import android.widget.TextView;    public class GlycaemicIndexAtoZActivity extends ListActivity {      /** Called when the activity is first created. */    private GlycaemicIndexItemAdapter giAdapter;     private TextWatcher filterTextWatcher;    private EditText filterText = null;    @Override    public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.giatoz);                ListView lv = getListView();    lv.setTextFilterEnabled(true);    // By using setAdapter method in listview we an add string array in list.    ArrayList<GlycaemicIndexItem> list = getListItems();    giAdapter = new GlycaemicIndexItemAdapter(this, R.layout.row, list);    giAdapter.notifyDataSetChanged();    setListAdapter(giAdapter);    filterText = (EditText)findViewById(R.id.GI_AtoZSearchEditText);    filterTextWatcher = new TextWatcher() {        public void afterTextChanged(Editable s) {            giAdapter.getFilter().filter(s); //Filter from my adapter            giAdapter.notifyDataSetChanged(); //Update my view        }        public void beforeTextChanged(CharSequence s, int start, int count,                int after) {        }        public void onTextChanged(CharSequence s, int start, int before,                int count) {        }    };    filterText.addTextChangedListener(filterTextWatcher);}private ArrayList<GlycaemicIndexItem> getListItems() {    ArrayList<GlycaemicIndexItem> result = new ArrayList<GlycaemicIndexItem>();    Resources res = getResources();    //Get our raw strings    String[] array = res.getStringArray(R.array.GIList);    for (int i = 0; i < array.length; i++) {        GlycaemicIndexItem gi = new GlycaemicIndexItem();        gi.setName(array[i]);        gi.setGlycaemicIndex(1);        result.add(gi);    }    return result;}private class GlycaemicIndexItemAdapter extends ArrayAdapter<GlycaemicIndexItem> {    private ArrayList<GlycaemicIndexItem> items;    private ArrayList<GlycaemicIndexItem> originalItems = new ArrayList<GlycaemicIndexItem>();    private GlycaemicIndexItemFilter filter;    private final Object mLock = new Object();    public GlycaemicIndexItemAdapter(Context context, int textViewResourceId, ArrayList<GlycaemicIndexItem> newItems) {            super(context, textViewResourceId, newItems);            this.items = newItems;            cloneItems(newItems);    }    protected void cloneItems(ArrayList<GlycaemicIndexItem> items) {        for (Iterator iterator = items.iterator(); iterator        .hasNext();) {            GlycaemicIndexItem gi = (GlycaemicIndexItem) iterator.next();            originalItems.add(gi);        }    }    @Override    public int getCount() {        synchronized(mLock) {            return items!=null ? items.size() : 0;          }    }    @Override    public GlycaemicIndexItem getItem(int item) {        GlycaemicIndexItem gi = null;        synchronized(mLock) {                gi = items!=null ? items.get(item) : null;        }        return gi;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {            View v = convertView;            if (v == null) {                LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);                v = vi.inflate(R.layout.row, null);            }            GlycaemicIndexItem i  = null;            synchronized(mLock) {                i = items.get(position);            }            if (i != null) {                    TextView tt = (TextView) v.findViewById(R.id.rowText);                    TextView bt = (TextView) v.findViewById(R.id.rowText2);                    if (tt != null) {                          tt.setText("Name: "+i.getName());                                                }                    if(bt != null){                          bt.setText("GI Value: " + i.getGlycaemicIndex());                    }            }            return v;    }    /**     * Implementing the Filterable interface.     */    public Filter getFilter() {        if (filter == null) {            filter = new GlycaemicIndexItemFilter();        }        return filter;    }       /**     * Custom Filter implementation for the items adapter.     *     */    private class GlycaemicIndexItemFilter extends Filter {        protected FilterResults performFiltering(CharSequence prefix) {            // Initiate our results object            FilterResults results = new FilterResults();            // No prefix is sent to filter by so we're going to send back the original array            if (prefix == null || prefix.length() == 0) {                synchronized (mLock) {                    results.values = originalItems;                    results.count = originalItems.size();                }            } else {                synchronized(mLock) {                        // Compare lower case strings                    String prefixString = prefix.toString().toLowerCase();                    final ArrayList<GlycaemicIndexItem> filteredItems = new ArrayList<GlycaemicIndexItem>();                    // Local to here so we're not changing actual array                    final ArrayList<GlycaemicIndexItem> localItems = new ArrayList<GlycaemicIndexItem>();                    localItems.addAll(originalItems);                    final int count = localItems.size();                    for (int i = 0; i < count; i++) {                        final GlycaemicIndexItem item = localItems.get(i);                        final String itemName = item.getName().toString().toLowerCase();                        // First match against the whole, non-splitted value                        if (itemName.startsWith(prefixString)) {                            filteredItems.add(item);                        } else {} /* This is option and taken from the source of ArrayAdapter                            final String[] words = itemName.split(" ");                            final int wordCount = words.length;                            for (int k = 0; k < wordCount; k++) {                                if (words[k].startsWith(prefixString)) {                                    newItems.add(item);                                    break;                                }                            }                        } */                    }                    // Set and return                    results.values = filteredItems;                    results.count = filteredItems.size();                }//end synchronized            }            return results;        }        @SuppressWarnings("unchecked")        @Override        protected void publishResults(CharSequence prefix, FilterResults results) {            //noinspection unchecked            synchronized(mLock) {                final ArrayList<GlycaemicIndexItem> localItems = (ArrayList<GlycaemicIndexItem>) results.values;                notifyDataSetChanged();                clear();                //Add the items back in                for (Iterator iterator = localItems.iterator(); iterator                        .hasNext();) {                    GlycaemicIndexItem gi = (GlycaemicIndexItem) iterator.next();                    add(gi);                }            }//end synchronized        }    }}