我正在使用RecyclerView中的SearchView搜索项目。当我在SearchView中键入某些内容时，未显示过滤器结果，并且该应用程序将退出。它没有提供任何日志。我很困惑在哪里使用notifyDataSetChanged方法。
这是适配器类的代码。
public class NewAdapter extends RecyclerView.Adapter<NewAdapter.ViewHolder> implements Filterable{
private ArrayList<CurrentEntry> listItems;
private ArrayList<CurrentEntry> filterList;
Context context;
public NewAdapter(ArrayList<CurrentEntry> listItemss, Context context) {
// this.listItems = listItems;
this.listItems=listItemss;
this.filterList=listItems;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_card,parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
/* CurrentEntry current=listItems.get(position);
holder.number.setText(current.getNo());
holder.Name.setText(current.getName());
holder.People.setText(current.getPeople());
holder.Estimate.setText(current.getEstimate());
holder.Foodie.setText(current.getFoodie());*/
holder.number.setText(filterList.get(position).getNo());
holder.Name.setText(filterList.get(position).getName());
holder.People.setText(filterList.get(position).getPeople());
holder.Estimate.setText(filterList.get(position).getEstimate());
holder.Foodie.setText(filterList.get(position).getFoodie());
}
@Override
public int getItemCount() {
return listItems.size();
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String charString=constraint.toString();
if(charString.isEmpty())
{
filterList=listItems;
}
else
{
ArrayList<CurrentEntry> myList=new ArrayList<>();
for(CurrentEntry temp:listItems)
{
if(temp.getName().toLowerCase().contains(charString));
filterList.add(temp);
}
filterList=myList;
}
FilterResults filterResults=new FilterResults();
filterResults.values=filterList;
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filterList=(ArrayList<CurrentEntry>) results.values;
notifyDataSetChanged();
}
};
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView number;
TextView Name ;
TextView People;
TextView Estimate;
TextView Foodie;
public ViewHolder(View itemView) {
super(itemView);
number=(TextView)itemView.findViewById(R.id.no);
Name=(TextView)itemView.findViewById(R.id.name);
People=(TextView)itemView.findViewById(R.id.people);
Estimate=(TextView)itemView.findViewById(R.id.estimate);
Foodie=(TextView)itemView.findViewById(R.id.foodie);
}
}
这是Json请求的代码
JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET,url,null,
new Response.Listener<JSONObject>()
{
@Override
public void onResponse(JSONObject response)
{
try
{
JSONObject object=new JSONObject(response.toString());
JSONArray data=object.getJSONArray("results");
for(int i=0;i<data.length();i++)
{
JSONObject json = data.getJSONObject(i);
final CurrentEntry c=new CurrentEntry();
newUrl=json.getString("foodie");
JsonObjectRequest request=new JsonObjectRequest(Request.Method.GET, newUrl, null, new Response.Listener<JSONObject>()
{
@Override
public void onResponse(JSONObject response)
{
try
{
String foodie_name=response.getString("username");
c.setFoodie(foodie_name);
} catch (JSONException e)
{
e.printStackTrace();
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error)
{
}
})
{
AppController.getInstance().addToRequestQueue(request,second_req);
c.setPeople(json.getString("no_people"));
c.setEstimate(json.getString("predicated_time"));
current.add(c);
}
}
catch (JSONException e)
{
}
adapter.notifyDataSetChanged();
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error)
{
if (error != null)
{
// Log.d(TAG, error.toString())
// Toast.makeText(getApplicationContext(), "Enter Valid Username and Password", Toast.LENGTH_LONG).show();
}
}
})
};
AppController.getInstance().addToRequestQueue(req,json_req);
}
您可以尝试使用SearchView并在Activity或Fragment中实现SearchView.OnQueryTextListener。
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//write your filtering code here and notify (with optional animation) your adapter
}
过滤逻辑是您实施的主观，我使用了以下方式：
private ArrayList<FilterItems> filter(ArrayList<FilterItems> filterItemList, String query) {
query = query.toLowerCase();
final ArrayList<FilterItems> filteredfilterItemList = new ArrayList<>();
for (FilterItems filterItem : filterItemList) {
final String text = filterItem.getItem().toLowerCase();
if (text.contains(query)) {
filteredfilterItemList.add(filterItem);
}
}
return filteredfilterItemList;
}
将您的getFilter方法更改为
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String charString=constraint.toString().toLowerCase();
ArrayList<CurrentEntry> myList=new ArrayList<>();
if(charString.isEmpty())
{
myList.addAll(listItems);
}
else
{
for(CurrentEntry temp:listItems)
{
if(temp.getName().toLowerCase().contains(charString));
myList.add(temp);
}
}
FilterResults filterResults=new FilterResults();
filterResults.values= myList;
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filterList.clear();
filterList.addAll((ArrayList<CurrentEntry>) results.values);
notifyDataSetChanged();
}
};
}
编辑
将您的constructor更改为
public NewAdapter(ArrayList<CurrentEntry> listItemss, Context context) {
// this.listItems = listItems;
this.listItems=listItemss;
this.filterList = new ArrayList<>();
this.filterList.addAll(listItems);
this.context = context;
}