我正在使用filterable进行搜索过滤。当我按关键字搜索时，我设法得到搜索结果，但在第一次搜索后列表视图为空。我希望它在用户输入为空时显示所有数据。
这是我编辑过的代码。现在我无法获得任何搜索结果。知道哪个部分还有错吗？
public class ProductListAdapter extends BaseAdapter implements Filterable {
private Context context;
private int layout;
private ArrayList<Booth> productList= new ArrayList<>();
private ArrayList<Booth> tempList = new ArrayList<>();
private ValueFilter mFilter = new ValueFilter();
public ProductListAdapter(Context context, int layout, ArrayList<Booth> productList) {
this.context = context;
this.layout = layout;
this.productList = productList;
this.tempList = productList;
}
@Override
public int getCount() {
return tempList.size();
}
public void addItems(ArrayList<Booth> items) {
productList.addAll(items);
tempList.addAll(items);
notifyDataSetChanged();
}
@Override
public Object getItem(int position) {
return tempList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(
int position, View view, ViewGroup viewGroup) {
Typeface face_02 = Typeface.createFromAsset(context.getAssets(), "customfont/grb.otf");
ViewHolder holder = new ViewHolder();
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(layout, null);
holder.Boothname = (TextView) view.findViewById(R.id.Boothname);
holder.Rating = (TextView) view.findViewById(R.id.Rating);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
Booth product = productList.get(position);
holder.Boothname.setText(product.getBoothName());
holder.Rating.setText(product.getRating());
holder.Rating.setTypeface(face_02);
holder.Boothname.setTypeface(face_02);
return view;
}
@Override
public Filter getFilter() {
return mFilter;
}
private class ValueFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
ArrayList<Booth> filterList = new ArrayList<Booth>();
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < productList.size(); i++) {
if ((productList.get(i).getBoothName().toLowerCase())
.contains(constraint.toString().toLowerCase())) {
Booth boothdata = new Booth(productList.get(i)
.getBoothName(), productList.get(i)
.getRating());
filterList.add(boothdata);
}
}
results.count = filterList.size();
results.values = filterList;
} else {
results.count = productList.size();
results.values = productList;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
tempList = (ArrayList<Booth>) results.values;
notifyDataSetChanged();
}
}
class ViewHolder {
TextView Boothname, Rating;
}
}
答案 0 :(得分：1)
filter data仅进行过滤，您将使用filter data而不是productList进行搜索，如下所示：
filterList = new List<Product>()// do clone here when you set new data to your list.
// then in the performFiltering(), use filterList instead.
for (int i = 0; i < filterList.size(); i++) {
if ((filterList.get(i).getBoothName().toLowerCase())
.startsWith(constraint.toString().toLowerCase())) {
Booth boothdata = new Booth(filterList.get(i)
.getBoothName(), filterList.get(i)
.getRating());
filterList.add(boothdata);
}
}
这是你应该做的。
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
productList = (ArrayList<Booth>) results.values; // if you use templist here, there's no change in getView
notifyDataSetChanged();
}
答案 1 :(得分：1)
这是因为您在用户搜索任何内容时更新原始列表。您必须使用保存临时数据的tempList并用于显示搜索结果，它还用于最初显示列表。而ProductList包含原始列表和它用于与搜索字符串进行比较。
初始化变量
private List<Booth> productList=new ArrayList<>(); //you have already done this,this contains original list
private List<Booth> tempList=new ArrayList<>(); //add this one is to show search result
添加数据的方法应如下所示：
public void addItems(List<Booth> items) {
productList.addAll(items);
tempList.addAll(items);
notifyDataSetChanged();
}
删除数据的方法应如下所示：
public void removeItems(){
productList.clear();
tempList.clear();
}
getItem和getCount方法应该是这样的：
@Override
public int getCount() {
return tempList.size();
}
@Override
public Booth getItem(int position) {
return tempList.get(position);
}
ValueFilter应该是这样的：
private class ValueFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
//filter list as a local variable
ArrayList<Booth> filterList = new ArrayList<Booth>();
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < productList.size(); i++) {
if ((productList.get(i).getBoothName().toLowerCase())
.startsWith(constraint.toString().toLowerCase())) {
Booth boothdata = new Booth(productList.get(i)
.getBoothName(), productList .get(i)
.getRating());
filterList.add(boothdata);
}
}
results.count = filterList.size();
results.values = filterList;
Log.e("VALUES", results.values.toString());
} else {
results.count = productList.size();
results.values = productList;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
tempList = (ArrayList<Booth>) results.values;
notifyDataSetChanged();
}
}