Question

I’m trying to filter a listview with arrayadapter. The arraydapter parameter is a String[][]. The problem is that anything happens. I must override the Filter interface? In that case plase, can someone provide some hints?

Every position of the array I’m trying to filter is like

 galleryValues[0][0] -> "tiulo"
              [0][1] -> "desc"
              [0][2] -> "etc"

I tryied to filter it:

lstContinente = (ListView)findViewById(R.id.list);
lstContinente.setTextFilterEnabled(true);
adapter = new PortaitArrayAdapter(cx,galleryValues);   
lstContinente.setAdapter(adapter);

ed_busqueda.addTextChangedListener(new TextWatcher() {           
    public void afterTextChanged(Editable s) {}      
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    // TODO Auto-generated method stub       
}        
public void onTextChanged(CharSequence s, int start, int before, int count) {
    adapter.getFilter().filter(s.toString());
    adapter.notifyDataSetChanged();                 
}        
});

The adapter code:

public class PortaitArrayAdapter extends ArrayAdapter<String> {
    private final Context context;
    private final String[][] values;
    private List<Imagen> imagenes = null;
    private LayoutInflater mInflater;
    public ImageLoader imageLoader;     


    public PortaitArrayAdapter(Context context, String[][] values) {
        super(context, R.layout.gallery_row);
        this.context = context;
        this.values = values;
        mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        imagenes = new ArrayList<Imagen>();
        for (int i = 0; i < 20; i++) imagenes.add(new Imagen());
        Bitmap def = BitmapFactory.decodeResource(this.context.getResources(),R.drawable.ic_launcher);
        imageLoader=new ImageLoader(this.context,def, imagenes);
    }



    @Override
    public int getCount (){
        return this.values.length;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();

            convertView =  mInflater.inflate(R.layout.gallery_row, parent, false);
            holder.txtTitulo = (TextView) convertView.findViewById(R.id.txt_gallery_titulo);
            holder.txtDesc = (TextView) convertView.findViewById(R.id.txt_gallery_desc);
            holder.txtFecha = (TextView) convertView.findViewById(R.id.txt_gallery_fecha);
            holder.txtEst = (TextView) convertView.findViewById(R.id.txt_gallery_est);
            holder.imageView    = (ImageView)convertView.findViewById(R.id.lst_img_gallery);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }


        /*LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.gallery_row, parent, false);*/

        //ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);


        Bitmap bmp;
        Log.v("Position --> ",String.valueOf(position));
        try {
            byte b[] = imagenes.get(position).getImageData();
            if (b != null) {
                bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
                if (bmp != null) holder.imageView.setImageBitmap(bmp);
            } else {

                String urlBase = galleryValues[position][0].substring(0, galleryValues[position][0].lastIndexOf("/")+1);
               String urlToEncode = galleryValues[position][0].substring(galleryValues[position][0].lastIndexOf("/")+1, galleryValues[position][0].length());

               urlToEncode = URLEncoder.encode(urlToEncode,"UTF-8");

               String url = urlBase.concat(urlToEncode);

               url = url.replace("+", "%20");
               Log.v("UrlFinal --> ",url);

                imageLoader.DisplayImage(String.valueOf(position),url,act,holder.imageView, position,null);
            }

        } catch (Exception e) {
            Log.e(this.getClass().getName(),"Exception en pos = " + position + " error:" + e.getMessage());
            e.printStackTrace();
        }


        holder.txtTitulo.setText(galleryValues[position][1] + ", " + galleryValues[position][2]);

        String[] dates = galleryValues[position][4].split("/");  
        String date = dates [1] + "/" + dates[0] + "/" + dates[2];
        Date d1 = new Date(date);
        DateFormat df = DateFormat.getDateInstance(DateFormat.LONG);
        holder.txtDesc.setText(galleryValues[position][3]);

        holder.txtFecha.setText(df.format(d1));
        holder.txtEst.setText(getText(R.string.num_fotos_gallery) + galleryValues[position][5] + " - " + getText(R.string.num_videos_gallery) + galleryValues[position][6] + " - " + getText(R.string.num_exp_gallery) + galleryValues[position][7]);

        return convertView;
    }

}

private static class ViewHolder {
    TextView txtTitulo;
    TextView txtDesc;
    TextView txtFecha;
    TextView txtEst;
    ImageView imageView;
}

Answer 1

Convert your String array to ArrayList and pass it to Adapter and use below code or change below code with your String[].

You need to implement Filterable to your Adapter class and Override getFilter()

Checkout this complete example for filtering custom Adapter.

public class ListFilterActivity extends ListActivity {

    private List<String> list = new ArrayList<String>();
    List<String> mOriginalValues;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final MyAdapter adapter = new MyAdapter(this, getModel());
        setListAdapter(adapter);

        EditText filterEditText = (EditText) findViewById(R.id.filterText);

        // Add Text Change Listener to EditText
        filterEditText.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // Call back the Adapter with current character to Filter
                adapter.getFilter().filter(s.toString());
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,int after) {
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });
    }

    private List<String> getModel() {
        list.add("Linux");
        list.add("Windows7");
        list.add("Suse");
        list.add("Eclipse");
        list.add("Ubuntu");
        list.add("Solaris");
        list.add("Android");
        list.add("iPhone");
        list.add("Windows XP");
        return list;
    }
}

// Adapter Class
public class MyAdapter extends BaseAdapter implements Filterable {

    List<String> arrayList;
    List<String> mOriginalValues; // Original Values
    LayoutInflater inflater;

    public MyAdapter(Context context, List<String> arrayList) {
        this.arrayList = arrayList;
        inflater = LayoutInflater.from(context);
    }

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

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    private class ViewHolder {
        TextView textView;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder = null;

        if (convertView == null) {

            holder = new ViewHolder();
            convertView = inflater.inflate(R.layout.row, null);
            holder.textView = (TextView) convertView
            .findViewById(R.id.textview);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(arrayList.get(position));
        return convertView;
    }

    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {

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

                arrayList = (List<String>) results.values; // has the filtered values
                notifyDataSetChanged();  // notifies the data with new filtered values
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();        // Holds the results of a filtering operation in values
                List<String> FilteredArrList = new ArrayList<String>();

                if (mOriginalValues == null) {
                    mOriginalValues = new ArrayList<String>(arrayList); // saves the original data in mOriginalValues
                }

                /********
                *
                *  If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
                *  else does the Filtering and returns FilteredArrList(Filtered)
                *
                ********/
                if (constraint == null || constraint.length() == 0) {

                    // set the Original result to return
                    results.count = mOriginalValues.size();
                    results.values = mOriginalValues;
                } else {
                    constraint = constraint.toString().toLowerCase();
                    for (int i = 0; i < mOriginalValues.size(); i++) {
                        String data = mOriginalValues.get(i);
                        if (data.toLowerCase().startsWith(constraint.toString())) {
                            FilteredArrList.add(data);
                        }
                    }
                    // set the Filtered result to return
                    results.count = FilteredArrList.size();
                    results.values = FilteredArrList;
                }
                return results;
            }
        };
        return filter;
    }
}