RecyclerView列表搜索(过滤)EditText问题

Question

我想在我的recyclerview列表中添加一个搜索功能，我通过查看教科书在互联网上尝试了这个代码，它工作得很好，但是如果你删除了edittext中的字母，列表不会回去，它只是删除列表。

示例:如果我在edittext中输入"I 12345"，其余的将被删除，只保留"I 12345"，但是如果我在edittext中删除文本，列表将不返回。

请帮忙修复!

这里是我所有的代码:

MainActivity java:

public class MainActivity extends AppCompatActivity {
RecyclerViewAdapter recyclerViewAdapter;
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerview1);
//here start search code

EditText editText = findViewById(R.id.izlash_edittext);
editText.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) {
filter(s.toString());
}
});

//here end search code
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
ArrayList<Item> items = new ArrayList<>();
items.add(new Item("start", R.drawable.start));
items.add(new Item("end", R.drawable.end));
recyclerView.setAdapter(recyclerViewAdapter);
}
//here start search code
private void filter(String title) {
ArrayList<Item> filteredList = new ArrayList<>();
for (Item item : recyclerViewAdapter.items) {
if (item.title.toLowerCase().contains(title.toLowerCase())) {
filteredList.add(item);
}
recyclerViewAdapter.filterList(filteredList);
}
}
//here end search code
}

RecyclerViewAdapter java:

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
ArrayList<Item> items;
ItemClickListener itemClickListener;
public RecyclerViewAdapter(ArrayList<Item> items, ItemClickListener itemClickListener) {
this.items = items;
this.itemClickListener = itemClickListener;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerViewAdapter.ViewHolder holder, int position) {
Item item = items.get(position);
holder.title.setText(item.title);
holder.imageView.setImageResource(item.image);
holder.itemView.setOnClickListener(view -> {
itemClickListener.onClick(item);
});
}
@Override
public int getItemCount() {
return items.size();
}
//here start search code
public void filterList(ArrayList<Item> filteredList) {
items = filteredList;
notifyDataSetChanged();
}
//here end search code
public interface ItemClickListener {
void onClick(Item item);
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView imageView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
title = itemView.findViewById(R.id.textView1);
imageView = itemView.findViewById(R.id.imageview1);
}
}
}

项java:

public class Item {
String title;
int image;
String qisqaMalumot;
String uzunMalumot;
public Item(String title, int image, String qisqaMalumot, String uzunMalumot) {
this.title = title;
this.image = image;
this.qisqaMalumot = qisqaMalumot;
this.uzunMalumot = uzunMalumot;
}
}

请帮帮我。

Answer 1

for (Item item : recyclerViewAdapter.items) {
if (item.title.toLowerCase().contains(title.toLowerCase())) {
filteredList.add(item);
}

当你在recyclerViewAdapter.items中搜索时，循环视图被新数据取代，旧数据消失。

首先创建全局列表ArrayList<Item> items = new ArrayList<>();

public class MainActivity extends AppCompatActivity {
RecyclerViewAdapter recyclerViewAdapter;
ArrayList<Item> items = new ArrayList<>();
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
} 

第二个替换items在你的for循环:

for (Item item : items) {
if (item.title.toLowerCase().contains(title.toLowerCase())) {
filteredList.add(item);
}

完成了!

Answer 2

首先需要在适配器中实现Filterable。然后，您需要在listadapter中保留一个经过过滤的项目，以便您可以恢复到它的旧状态。当您登录到主活动中的edittext查询时，这样适配器就可以更改并恢复到原来的状态。如果你按照自己的想法编辑代码，它会很顺利地工作。

public class BulletinAdapter extends RecyclerView.Adapter<BulletinAdapter.BulletinVHolder> implements Filterable {
private Context context;
private List<EventResponseItem> eventsItemList;
private List<EventResponseItem> filteredList;
public BulletinAdapter(Context context, List<EventResponseItem> eaItemList) {
this.context = context;
this.filteredList = eaItemList;
}
@NonNull
@Override
public BulletinVHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new BulletinVHolder(RowNewaddBinding.inflate(LayoutInflater.from(context), parent, false));
}
@Override
public void onBindViewHolder(@NonNull BulletinVHolder holder, int position) {
EventResponseItem eaItem = filteredList.get(position);
if (eaItem != null) {
holder.bind.rowNewMatchId.setText(String.valueOf(eaItem.getEid()));
}
}
@Override
public int getItemCount() {
if (filteredList != null && filteredList.size() > 0) {
return filteredList.size();
} else {
return 0;
}
}
@Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String charString = constraint.toString();
if (constraint.length() == 0) {
filteredList = eventsItemList;
} else {
List<EventResponseItem> filterList = new ArrayList<>();
for (EventResponseItem modelMovie : eventsItemList) {
if (modelMovie.getEprt().get(0).getPn().toLowerCase().contains(charString) | modelMovie.getEprt().get(1).getPn().toLowerCase().contains(charString)) {
filterList.add(modelMovie);
}
}
filteredList = filterList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = filteredList;
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredList = (List<EventResponseItem>) results.values;
notifyDataSetChanged();
}
};
}
class BulletinVHolder extends RecyclerView.ViewHolder {
private RowNewaddBinding bind;
public BulletinVHolder(@NonNull RowNewaddBinding bind) {
super(bind.getRoot());
this.bind = bind;
}
}
}

MainActivity.class . .

private List<EventResponseItem> eventsItemList; //set list data
private BulletinAdapter bulletinAdapter; //recyclerview set adapter...(data and layoutmanager)
bulletinAdapter = new BulletinAdapter(MatchAddNew.this,eventsItemList);
bind.matchAddNewRecyclerView.setLayoutManager(new LinearLayoutManager(MatchAddNew.this));
bind.matchAddNewRecyclerView.setAdapter(bulletinAdapter); 
search(bind.searchViewNewMatch); //viewBinding your edittext...

private void search(SearchView searchView) {
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String s) {
return false;
}

@Override
public boolean onQueryTextChange(String s) {
if (bulletinAdapter != null) {
bulletinAdapter.getFilter().filter(s.toLowerCase());
}

return true;
}
});
}