我已经在对象的自定义列表中应用了一个过滤器。我已经应用了过滤器，它只是第一次工作。当我试图删除过滤文本并输入另一个时，它无法在ListView中给我更新的数据。这是我的代码，
适配器类
public class ServiceListAdapter extends ArrayAdapter<ServiceItem> implements Filterable {
private Context mContext;
private List<ServiceItem> serviceItemList;
private List<ServiceItem> nameList;
private LayoutInflater inflater;
private int layoutId;
private ServiceFilter filter;
public ServiceListAdapter(Context context, int resource, List<ServiceItem> serviceItemList) {
super(context, resource, serviceItemList);
this.mContext = context;
this.serviceItemList = serviceItemList;
this.layoutId = resource;
this.inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ServiceHolder sHolder = null;
if (v == null) {
v = inflater.inflate(layoutId, null);
sHolder = new ServiceHolder();
sHolder.serviceName = (TextView) v.findViewById(R.id.serviceName);
sHolder.serviceDetail = (TextView) v.findViewById(R.id.serviceDetail);
sHolder.serviceImg = (ImageView) v.findViewById(R.id.serviceImg);
sHolder.btnGo = (Button) v.findViewById(R.id.btnGo);
v.setTag(sHolder);
} else {
sHolder = (ServiceHolder) convertView.getTag();
}
ServiceItem serviceItem = getItem(position);
sHolder.serviceName.setText(serviceItem.getServiceName());
sHolder.serviceDetail.setText(serviceItem.getServiceDetail());
sHolder.serviceImg.setImageResource(serviceItem.getServiceImg());
sHolder.btnGo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
return v;
}
static class ServiceHolder {
TextView serviceName;
TextView serviceDetail;
ImageView serviceImg;
Button btnGo;
}
@Override
public ServiceItem getItem(int position) {
return serviceItemList.get(position);
}
@Override
public Filter getFilter() {
if (filter == null) {
filter = new ServiceFilter();
}
return filter;
}
private class ServiceFilter extends Filter {
private static final String TAG = "Filter";
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
Log.d(TAG, "Length: " + constraint.toString().length());
if (constraint != "" && constraint.toString().length() > 0) {
ArrayList<ServiceItem> filterItems = new ArrayList<>();
ArrayList<ServiceItem> sItems = new ArrayList<>();
synchronized (this)
{
sItems.addAll(serviceItemList);
}
constraint = constraint.toString().toLowerCase();
Log.d(TAG, "To Compare:: " + constraint);
for (int l = 0; l< sItems.size(); l++) {
Log.d(TAG, "sItems Size:" + sItems.size());
ServiceItem sItem = sItems.get(l);
String name = sItem.toString();
Log.d(TAG, "Name: " + name);
if (name.startsWith(constraint.toString().toLowerCase())){
Log.d(TAG, "Added: " + name);
filterItems.add(sItem);
}
}
Log.d(TAG, "Filter Item Size: " + filterItems.size());
filterResults.count = filterItems.size();
filterResults.values = filterItems;
} else {
synchronized (this) {
Log.d(TAG, "performFiltering: ORIGINAL ");
Log.d(TAG, "Filter Item Size: " + serviceItemList.size());
filterResults.values = serviceItemList;
filterResults.count = serviceItemList.size();
}
}
Log.d(TAG, "Count:" + filterResults.count);
return filterResults;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
/*nameList is List<ServiceItem> declared in root class*/
nameList = (ArrayList<ServiceItem>) results.values;
notifyDataSetChanged();
clear();
for(int i = 0, l = nameList.size(); i < l; i++)
add(nameList.get(i));
notifyDataSetInvalidated();
}
}
}
EditText texttwatcher Code:
edtFilterText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
Log.d("Filter", "beforeTextChanged: " +s);
serviceListAdapter.getFilter().filter(s.toString().toLowerCase());
}
});
所以，我只是第一次得到了过滤的结果。然后，当我试图改变editText内容时，它向我显示没有过滤项目的结果，并且还记录显示主serviceItems列表大小为零，没有项目。
帮我解决这个问题，我已经尝试了很多答案，但我的结果是这样的。
对于你的信息，我已经解决了这个问题
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
serviceItemList.clear();
if (charText.length() == 0) {
serviceItemList.addAll(nameList);
}
else
{
for (ServiceItem si : nameList)
{
if (si.getServiceName().toLowerCase(Locale.getDefault()).contains(charText))
{
serviceItemList.add(si);
}
}
}
notifyDataSetChanged();
}
和调用方法与前一个相同，只是有一点变化，
serviceListAdapter.filter(s.toString().toLowerCase());
了解更多信息它不是我们必须从过滤器类中实现的方法。它的手工方法很有魅力。