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; } } }