自定义筛选自定义ArrayAdapter中的ListView [英] Custom filtering for Custom ArrayAdapter in ListView
问题描述
我写了自己的ArrayAdapter像这样的:
i write a own ArrayAdapter like this one:
public class PoiListAdapter extends ArrayAdapter<Poi> implements Filterable {
private Context context;
private final List<Poi> valuesPoi;
private ItemsFilter mFilter;
public PoiListAdapter(Context context, List<Poi> valuesPoi) {
super(context, R.layout.poilist);
this.context = context;
this.valuesPoi = valuesPoi;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.poilist, parent, false);
TextView textViewName = (TextView) rowView.findViewById(R.id.name_poi);
TextView textViewDis = (TextView) rowView
.findViewById(R.id.discrip_poi);
textViewName.setText(valuesPoi.get(position).getName());
textViewDis.setText(valuesPoi.get(position).getDiscription());
return rowView;
}
/**
* Implementing the Filterable interface.
*/
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemsFilter(this);
}
return mFilter;
}
public List<Poi> getValuesPoi() {
return valuesPoi;
}
public void addValuesPoi(Poi p) {
valuesPoi.add(p);
}
@Override
public void clear() {
valuesPoi.clear();
}
}
有关本适配器我想要实现搜索功能。因此,我实现一个自定义过滤器系列:
For this Adapter I want to implement a search function. Therefore I implement a custom Filter-Class:
public class ItemsFilter extends Filter {
private PoiListAdapter poiListAdapter;
public ItemsFilter(PoiListAdapter poiListAdapter) {
this.poiListAdapter = poiListAdapter;
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
constraint = constraint.toString().toLowerCase();
FilterResults result = new FilterResults();
ArrayList<Poi> filterList = new ArrayList<Poi>();
if (constraint != null && constraint.toString().length() > 0) {
ArrayList<Poi> orginalList = new ArrayList<Poi>(
poiListAdapter.getValuesPoi());
for (Poi p : orginalList) {
if (p.getName().toLowerCase().contains(constraint))
filterList.add(p);
}
Log.i("DEBUG", orginalList.toString());
result.values = filterList;
result.count = filterList.size();
} else {
result.values = poiListAdapter.getValuesPoi();
result.count = poiListAdapter.getValuesPoi().size();
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
ArrayList<Poi> fitems = (ArrayList<Poi>) results.values;
poiListAdapter.clear();
for (Poi p : fitems) {
poiListAdapter.addValuesPoi(p);
poiListAdapter.notifyDataSetChanged();
}
}
的1.问题
....是,我得到了一个java.util.concurrentmodificationexception为:
....is that i got a java.util.concurrentmodificationexception for:
for (Poi p : fitems) {
poiListAdapter.addValuesPoi(p);
poiListAdapter.notifyDataSetChanged();
}
我觉得问题是,我想modifi下访问一个ArrayList的。我觉得我有同步工作,但在此之前我从未使用过它。
I think the problem is that I want to modifi a Arraylist under access. I think I have to work with synchronized, but I have never worked with it before.
更新: 这问题就解决了!在这里,code:
UPDATE: This is problem is solved! Here the Code:
for(Iterator<Poi> i = fitems.iterator(); i.hasNext();) {
Poi p = i.next();
poiListAdapter.addValuesPoi(p);
//poiListAdapter.notifyDataSetChanged();
}
2的问题
列表视图是空的开始。一开始我想显示的所有内容!也就是没有通过搜索的元素显示出来!列表视图显示什么的那一刻!
The List view is empty at start. At the start i want to shown all elements! Also is nothing displayed by searching an element! Listview shows nothing at the moment!
推荐答案
我可以解决我的问题。在这里,我的解决方案!
i could solve my Problems. Here my solution!
package hsos.ds.helper;
import hsos.ds.db.Poi;
import java.util.ArrayList;
import java.util.List;
import android.widget.Filter;
public class ItemsFilter extends Filter {
private PoiListAdapter poiAdapter;
private List<Poi> valuesPoi;
private List<Poi> filteredPoi;
public ItemsFilter(PoiListAdapter _poiAdapter) {
this.poiAdapter = _poiAdapter;
this.valuesPoi = poiAdapter.getValuesPoi();
this.filteredPoi = poiAdapter.getFilteredPoi();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults result = new FilterResults();
constraint = constraint.toString().toLowerCase();
if (constraint == null || constraint.length() == 0) {
ArrayList<Poi> list = new ArrayList<Poi>(valuesPoi);
result.values = valuesPoi;
result.count = valuesPoi.size();
} else {
final ArrayList<Poi> orginalList = new ArrayList<Poi>(valuesPoi);
final ArrayList<Poi> filterList = new ArrayList<Poi>();
int count = orginalList.size();
for (int i = 0; i < count; i++) {
final Poi p = orginalList.get(i);
if (p.getName().toLowerCase().contains(constraint))
filterList.add(p);
}
result.values = filterList;
result.count = filterList.size();
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredPoi = (List<Poi>) results.values;
poiAdapter.notifyDataSetChanged();
poiAdapter.clear();
int count = filteredPoi.size();
for (int i = 0; i < count; i++) {
poiAdapter.add(filteredPoi.get(i));
poiAdapter.notifyDataSetInvalidated();
}
}
}
和适配器:
公共类PoiListAdapter扩展ArrayAdapter实现可筛选{
public class PoiListAdapter extends ArrayAdapter implements Filterable {
private List<Poi> valuesPoi;
private List<Poi> filteredPoi;
private ItemsFilter mFilter;
public PoiListAdapter(Context context, List<Poi> valuesPoi) {
super(context, R.layout.poilist);
this.valuesPoi = new ArrayList<Poi>(valuesPoi);
this.filteredPoi = new ArrayList<Poi>(valuesPoi);
this.mFilter = new ItemsFilter(this);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.poilist, null);
}
Poi p = filteredPoi.get(position);
if (p != null) {
TextView tt = (TextView) v.findViewById(R.id.name_poi);
TextView bt = (TextView) v.findViewById(R.id.discrip_poi);
if (tt != null) {
tt.setText(p.getName());
}
if (bt != null) {
bt.setText(p.getDiscription());
}
}
return v;
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemsFilter(this);
}
return mFilter;
}
public List<Poi> getValuesPoi() {
return valuesPoi;
}
public List<Poi> getFilteredPoi() {
return filteredPoi;
}
}
要显示的完整列表 ONSTART()
我插入了一个小黑客中的 ONSTART()
我的活动 - 方法,因为完整列表输入后显示:
To show the complete list onStart()
i insert the a little "hack" in the onStart()
-Method of my activity because the complete list is shown after an input:
if(searchText!=null){
searchText.setText(" ");
searchText.setText("");
}
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