使用 arrayadapter 来 filter 一个 listview

原问题来自于CSDN问答频道，更多解决方案见：http://ask.csdn.net/questions/1679

问题描述：

我使用 arrayadapter 来 filter 一个 listview。Arraydapter 的参数是一个String[][]。但是没有成功，必须要重写 Filter interface吗？要是这样的话，如何重写呢？
filter 数组的每一个位置：

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

解决方案：

把字符串数组放在 ArrayList 中，然后把它传递到 Adapter。使用下面的代码或者用 String[]更改下面的代码。
需要在 Adapter 类中实现 Filterable ，重写 getFilter()。
参考下面的代码关于 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;            }        }    }