[英]recyclerview opens wrong item after filtering list using search
这是我的菜单片段
public class MenuFragment extends Fragment {
@BindView(R.id.rvMenu)
RecyclerView rvMenu;
@BindView(R.id.etSearch)
EditText etSearch;
@BindView(R.id.llNoDataFound)
LinearLayout llNoDataFound;
@BindView(R.id.llSearch)
LinearLayout llSearch;
RestaurantDatabase restaurantDatabase;
List<ItemTable> itemTableList;
ItemListAdapter itemListAdapter;
MySharedPreference mySharedPreference;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View root = inflater.inflate(R.layout.fragment_menu, container, false);
ButterKnife.bind(this, root);
initAll();
return root;
}
private void initAll() {
restaurantDatabase = RestaurantDatabase.getRestaurantDatabase(getContext());
mySharedPreference = new MySharedPreference(getContext());
itemTableList = new ArrayList<>();
itemListAdapter = new ItemListAdapter(getContext(), itemTableList, position -> {
ItemTable itemTable = itemTableList.get(position);
Intent intent = new Intent(getContext(), AddMenuActivity.class);
intent.putExtra("data", itemTable);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivityForResult(intent, 100);
});
rvMenu.setLayoutManager(new GridLayoutManager(getContext(), 2));
rvMenu.setItemAnimator(new DefaultItemAnimator());
rvMenu.setAdapter(itemListAdapter);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(rvMenu);
getDataFromApi();
etSearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
/*
This method is called to notify you that, within s, the count characters beginning at the start are about to be replaced by new text with length after.
*/
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
/*
This method is called to notify you that, within s, the count characters beginning at the start have just replaced old text that had length before.
*/
}
@Override
public void afterTextChanged(Editable editable) {
itemListAdapter.getFilter().filter(editable.toString());
}
});
}
ItemTable deletedItem = null;
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
switch (direction) {
case ItemTouchHelper.LEFT:
direction(position);
break;
case ItemTouchHelper.RIGHT:
direction(position);
break;
default:
break;
}
}
private void direction(int position) {
deleteDataFromLocalDatabase(position);
deletedItem = itemTableList.get(position);
undoMethod(deletedItem, position);
}
@Override
public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
new RecyclerViewSwipeDecorator.Builder(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
.addBackgroundColor(ContextCompat.getColor(getContext(), R.color.gray))
.addActionIcon(R.drawable.ic_baseline_delete_outline_24)
.create()
.decorate();
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
};
public void undoMethod(ItemTable deletedItem, int position) {
Snackbar.make(rvMenu, "" + deletedItem.getItemName() + " is deleted Successfully", BaseTransientBottomBar.LENGTH_LONG)
.setAction("Undo", view -> {
itemTableList.add(position, deletedItem);
itemListAdapter.notifyItemChanged(position);
try {
Thread thread = new Thread() {
@Override
public void run() {
Looper.prepare();
/*
do In background
* */
ItemTable itemTable;
try {
itemTable = new ItemTable(deletedItem.getItemName(), deletedItem.getItemImage(), deletedItem.getItemPrice(),mySharedPreference.getrdRestaurantName());
} catch (NumberFormatException ex) {
itemTable = new ItemTable(deletedItem.getItemName(), deletedItem.getItemImage(), 0,mySharedPreference.getrdRestaurantName());
}
Long aLong = restaurantDatabase.getItemDao().insertItemTable(itemTable);
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
/*
post background
* */
if (aLong > 0) {
getDataFromApi();
} else {
Toast.makeText(getContext(), "Insert Failed", Toast.LENGTH_SHORT).show();
}
handler.removeCallbacks(this);
}
}, 0000);
Looper.loop();
}
};
thread.start();
} catch (Exception ex) {
Log.e("error =>", "" + ex.getMessage());
ex.printStackTrace();
}
}).show();
}
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 100 && resultCode == Activity.RESULT_OK) {
getDataFromApi();
}
}
@OnClick(R.id.fbtnAdd)
public void onbtnAddClick() {
Intent intent = new Intent(getContext(), AddMenuActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivityForResult(intent, 100);
getActivity().overridePendingTransition(R.anim.slide_up,
R.anim.slide_down);
}
public void getDataFromApi() {
try {
Thread thread = new Thread() {
@Override
public void run() {
Looper.prepare();
/*
do In background
* */
List<ItemTable> itemTables = restaurantDatabase.getItemDao().fetchAllItemTableData(mySharedPreference.getrdRestaurantName());
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(() -> {
/*
post background
* */
itemTableList.clear();
itemTableList.addAll(itemTables);
if (itemTableList.isEmpty()) {
mySharedPreference.setMenuSwipeValue(true);
llNoDataFound.setVisibility(View.VISIBLE);
llSearch.setVisibility(View.GONE);
} else {
llNoDataFound.setVisibility(View.GONE);
llSearch.setVisibility(View.VISIBLE);
}
if (itemTableList.size() > 1) {
mySharedPreference.setMenuSwipeValue(false);
}
if (itemTableList.size() == 1 && mySharedPreference.getMenuSwipeValue()) {
showSwipeDialog();
}
itemListAdapter.notifyDataSetChanged();
}, 0000);
Looper.loop();
}
};
thread.start();
} catch (Exception ex) {
Log.e("ERROR =>", "" + ex.getMessage());
ex.printStackTrace();
}
}
public void deleteDataFromLocalDatabase(int position) {
try {
Thread thread = new Thread() {
@Override
public void run() {
Looper.prepare();
/*
do In background
* */
int delete = restaurantDatabase.getItemDao().deleteItemTableData(itemTableList.get(position));
Boolean aBoolean;
if (delete > 0) {
aBoolean = true;
} else {
aBoolean = false;
}
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
/*
post background
* */
if (Boolean.TRUE.equals(aBoolean)) {
getDataFromApi();
} else {
Toast.makeText(getContext(), "Failed Delete Item", Toast.LENGTH_SHORT).show();
}
handler.removeCallbacks(this);
}
}, 0000);
Looper.loop();
}
};
thread.start();
} catch (Exception ex) {
Log.e("ERROR =>", "" + ex.getMessage());
ex.printStackTrace();
}
}
private void showSwipeDialog() {
Dialog dialogSwipe = new Dialog(getActivity(), android.R.style.Theme_Dialog);
dialogSwipe.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialogSwipe.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialogSwipe.setContentView(R.layout.dialog_swipe_left_right);
dialogSwipe.show();
dialogSwipe.setCancelable(false);
TextView tvGotIt = (TextView) dialogSwipe.findViewById(R.id.tvGotIt);
tvGotIt.setOnClickListener(view -> {
dialogSwipe.dismiss();
mySharedPreference.setMenuSwipeValue(false);
});
}
}
这是我的ItemListAdapter
public class ItemListAdapter extends RecyclerView.Adapter<ItemListAdapter.MyViewHolder> implements Filterable {
List<ItemTable> itemTableList;
List<ItemTable> filterableItemList;
OnItemEditOrDeleteListener onItemEditOrDeleteListener;
Context context;
Random random;
String[] colour;
public interface OnItemEditOrDeleteListener {
void onItemClicked(int position);
}
public ItemListAdapter(Context context, List<ItemTable> itemTableList, OnItemEditOrDeleteListener onItemEditOrDeleteListener) {
colour = new String[]{"#F8E096", "#F8D9D7", "#FDE1E1", "#FDE4C0", "#FAD9CE", "#F6B1C9", "#E8FAD3", "#E3FBF9", "#F4DEF8", "#D9EDFD", "#D2D7F4", "#E6E5E5"};
random = new Random();
filterableItemList = itemTableList;
this.context = context;
this.onItemEditOrDeleteListener = onItemEditOrDeleteListener;
this.itemTableList = itemTableList;
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charsequence = charSequence.toString();
if (charsequence.isEmpty()) {
filterableItemList = itemTableList;
} else {
List<ItemTable> menuListModels = new ArrayList<>();
for (ItemTable row : itemTableList) {
if (row.getItemName().toLowerCase().contains(charsequence.toLowerCase())) {
menuListModels.add(row);
}
}
filterableItemList = menuListModels;
}
FilterResults filterResults = new FilterResults();
filterResults.values = filterableItemList;
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
filterableItemList = (ArrayList<ItemTable>) filterResults.values;
notifyDataSetChanged();
}
};
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.menu_item_inflater, parent, false);
return new MyViewHolder(itemView);
}
public class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tvMenuName)
TextView tvMenuName;
@BindView(R.id.tvMenuPrice)
TextView tvMenuPrice;
@BindView(R.id.ivMenuImage)
CircleImageView ivMenuImage;
@BindView(R.id.cvMenu)
CardView cvMenu;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this,itemView);
}
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
ItemTable data = filterableItemList.get(holder.getAdapterPosition());
holder.tvMenuName.setText("" + data.getItemName());
holder.tvMenuPrice.setText("€ " + data.getItemPrice());
if (data.getItemImage() != null) {
Glide.with(context)
.load(data.getItemImage())
.centerCrop()
.into(holder.ivMenuImage);
} else {
Glide.with(context)
.load(R.drawable.background)
.centerCrop()
.into(holder.ivMenuImage);
}
holder.cvMenu.setOnClickListener(view -> onItemEditOrDeleteListener.onItemClicked(holder.getAdapterPosition()));
holder.cvMenu.setCardBackgroundColor(Color.parseColor(colour[random.nextInt(colour.length - 1)]));
}
@Override
public int getItemCount() {
return filterableItemList.size();
}
}
基本上，如果我不使用搜索过滤器，回收器会按预期工作，当我单击一个项目时，它会打开并显示所单击项目的信息。
但是，如果我使用搜索过滤器过滤列表并单击一个项目，它将打开并显示错误信息。 我注意到它在使用搜索过滤器时打开的信息是它显示了在使用搜索过滤器之前存在的项目的 position 的信息。
我进行了搜索，很可能问题出在我的适配器中，但我找不到问题。
itemListAdapter = new ItemListAdapter(getContext(), itemTableList, position -> {
ItemTable itemTable = itemTableList.get(position); //<<<< The error is here
});
问题是您从最初发送给适配器的片段中的原始列表中获取单击的项目。
解决方案：
从过滤列表中获取项目，您可以在适配器中创建一个返回过滤列表的方法：
public List<ItemTable> getFilteredList() {
return filterableItemList;
}
并替换：
ItemTable itemTable = itemTableList.get(position);
和：
ItemTable itemTable = itemListAdapter.getFilteredList().get(position);
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