问题描述
- 使用 arrayadapter 来 filter 一个 listview
-
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;
}
}
}
时间： 2024-09-12 12:43:04