我使用addTextChangeListener来过滤列表项。当用户在editText上输入字符时,将根据用户输入过滤项目。例如,如果用户输入“stackoverflow”,则显示包含“stackoverflow”的所有项目。它工作正常,但一旦用户按退格键删除字符,项目就不会被删除,直到他删除所有字符。
例如,我的项目是:“stackoverflow 1”,“stackoverflow 2”,“stackoverflow 3”,“stackoverflow 4”。
如果用户输入为“stackoverflow”,则显示所有项目。如果用户输入为“stackoverflow 1”,则仅显示“stackoverflow 1”。然后用户删除最后2个字符(1和空格)。用户输入现在是“stackoverflow”,但仍然显示“stackoverflow 1”,并且不显示其他项目。
这是我的自定义过滤器:
private class ServiceFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint == null || constraint.length() == 0) {
// No filter implemented we return all the list
results.values = origServiceList;
results.count = origServiceList.size();
}
else {
List<ServiceModel> nServiceList = new ArrayList<ServiceModel>();
for (ServiceModel s : serviceList) {
if (s.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
nServiceList.add(s);
}
}
results.values = nServiceList;
results.count = nServiceList.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results.count == 0) {
notifyDataSetInvalidated();
}
else {
serviceList = (List<ServiceModel>) results.values;
notifyDataSetChanged();
}
}
}
我如何处理文字更改事件:
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
if (cs.length() >= 1) {
mAdapter.getFilter().filter(cs);
}
else {
mAdapter = new ServiceAdapter(MyActivity.this, R.layout.ussd_list_item, serviceList);
listView.setAdapter(mAdapter);
}
}
});
答案 0 :(得分:1)
我会说,因为您过滤了现有的过滤结果,而不是原始结果。因此,当您开始退格时,它只会在您之前的结果中进行搜索。
试试看它是否修复了它:
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint == null || constraint.length() == 0) {
// No filter implemented we return all the list
results.values = origServiceList;
results.count = origServiceList.size();
}
else {
List<ServiceModel> nServiceList = new ArrayList<ServiceModel>();
for (ServiceModel s : origServiceList) {
if (s.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
nServiceList.add(s);
}
}
results.values = nServiceList;
results.count = nServiceList.size();
}
return results;
}