Question

我需要此过滤器的帮助，或使用recyclerView在片段上使用editText进行搜索，当afterTextChanged运行过滤器和吐司显示正确的数据，但在recyclerView中仅显示空白列表时，我尝试创建新的添加列表，但仍然不显示任何内容。 >

这是我的片段

public class HomeFragment extends Fragment {

    private SQLiteHandler db;
    private TextView welcome;
    private TextView jmlInspection;
    private RecyclerView mRecyclerView;
    private ListAdapter mListadapter;
    EditText searchHome;
    private ArrayList<DataNote> arraylist = new ArrayList<DataNote>();

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home, container, false);


        // SqLite database handler
        db = new SQLiteHandler(getActivity().getApplicationContext());

        // Fetching user details from sqlite
        HashMap<String, String> user = db.getUserDetails();
        String name = user.get("name");

        welcome = (TextView) view.findViewById(R.id.txtWelcome);
        jmlInspection = (TextView) view.findViewById(R.id.txtJmlInspection);
        mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        searchHome = (EditText) view.findViewById(R.id.searchHome);

        welcome.setText("Welcome, "+name +"!");
        jmlInspection.setText("Saat ini anda memiliki 7 Data.");

        final LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(layoutManager);

        //ArrayList data = new ArrayList<DataNote>();
        for (int i = 0; i < DataNoteImformation.id.length; i++)
        {
            DataNote wp = new DataNote(
                    DataNoteImformation.id[i],
                    DataNoteImformation.branchArray[i],
                    DataNoteImformation.assetcodeArray[i],
                    DataNoteImformation.customerArray[i],
                    DataNoteImformation.licenseplateArray[i]
            );
            arraylist.add(wp);
        }

        mListadapter = new ListAdapter(arraylist);
        mRecyclerView.setAdapter(mListadapter);

        searchHome.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence query, int i, int i1, int i2) {


            }

            @Override
            public void afterTextChanged(Editable editable) {
                String text = searchHome.getText().toString().toLowerCase(Locale.getDefault());
                mListadapter.filter(text);
            }
        });

        return view;
    }

    public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ViewHolder>
    {
        private ArrayList<DataNote> dataList;
        private List<DataNote> filterlist = null;

        public ListAdapter(ArrayList<DataNote> data)
        {
            this.dataList = data;
            this.filterlist = data;
        }

        public class ViewHolder extends RecyclerView.ViewHolder
        {
            TextView textViewBranch;
            TextView textViewAsset;
            TextView textViewCustomer;
            TextView textViewLicense;
            Button btnReceive;

            public ViewHolder(View itemView)
            {
                super(itemView);
                this.textViewBranch = (TextView) itemView.findViewById(R.id.branch);
                this.textViewAsset = (TextView) itemView.findViewById(R.id.assetcode);
                this.textViewCustomer = (TextView) itemView.findViewById(R.id.customername);
                this.textViewLicense = (TextView) itemView.findViewById(R.id.licenseplate);
                this.btnReceive = (Button) itemView.findViewById(R.id.receiveBtn);
            }
        }

        @Override
        public ListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
        {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item, parent, false);

            ViewHolder viewHolder = new ViewHolder(view);
            return viewHolder;
        }

        @Override
        public void onBindViewHolder(ListAdapter.ViewHolder holder, final int position)
        {
            holder.textViewBranch.setText(dataList.get(position).getBranch());
            holder.textViewAsset.setText(dataList.get(position).getAssetcode());
            holder.textViewCustomer.setText(dataList.get(position).getCustomer());
            holder.textViewLicense.setText(dataList.get(position).getLisenceplate());

            holder.btnReceive.setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View v)
                {
                    //Toast.makeText(getActivity(), "Item " + position + " is clicked.", Toast.LENGTH_SHORT).show();
                    Intent intent = new Intent(getActivity(),
                            AssetReceiveActivity.class);
                    intent.putExtra("name",dataList.get(position).getCustomer());
                    intent.putExtra("code",dataList.get(position).getAssetcode());
                    intent.putExtra("plat",dataList.get(position).getLisenceplate());
                    startActivity(intent);
                }
            });
        }

        @Override
        public int getItemCount()
        {
            return dataList.size();
        }

        public void filter(String charText) {
            charText = charText.toLowerCase(Locale.getDefault());
            filterlist.clear();
            if (charText.length() == 0) {
                filterlist.addAll(dataList);
            }
            else
            {
                for (DataNote wp : dataList)
                {
                    if (wp.getCustomer().toLowerCase().contains(charText.toLowerCase()))
                    {
                        //Toast.makeText(getActivity(), "data " + wp.getCustomer() , Toast.LENGTH_SHORT).show();
                        filterlist.add(wp);
                    }
                }
            }
            notifyDataSetChanged();
        }

    }

}

Logcat上没有错误。我为此需要帮助，对不起，英语不好。

Answer 1

看这个例子

适配器

public class ListAdapter extends RecyclerView.Adapter<ItemHolder> implements Filterable {


    private Context iContext;

    private List<DataNote > dataList = new ArrayList<>();
    private List<DataNote > filterlist = new ArrayList<>();

    public ListAdapter (List<DataNote > dataList, Context context) {
        this.dataList = dataList;
        this.filterlist = dataList;
        iContext = context;
    }

    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                dataList= (List<DataNote >) results.values;
                notifyDataSetChanged();
            }
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();
                List<DataNote> filteredList = new ArrayList<>();
                String searchText = constraint.toString().toLowerCase();
                String[] split = searchText.split(",");
                ArrayList<String> searchGenres = new ArrayList<>(split.length);
                for (String aSplit : split) {
                    // remove spaces
                    String trim = aSplit.trim();
                    // skip empty entries
                    if (trim.length() > 0)
                        searchGenres.add(trim);
                }

                for (DataNote dataNames : filterlist) {
                    // filter by title
                    if (dataNames.getCustomer().toLowerCase().trim().contains(searchText)) {
                        filteredList.add(dataNames);
                    }
                }
                results.count = filteredList.size();
                results.values = filteredList;
                return results;
            }

        };
        return filter;
    }



}

在Fragment中：

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    mListadapter.getFilter().filter(s.toString());
}

Answer 2

1）在绑定中，您正在从dataList对象访问对象，并且getItemCount（）还返回dataList的大小。

2）在过滤期间，您正在执行过滤并将已过滤的数据存储在filterlist中，并调用notifyDataSetChanged（）。

因此，此处始终显示具有所有数据的dataList，而不显示具有已过滤数据的filterlist。

如果要显示过滤的数据，则应将过滤器列表与recyclerview一起使用，

public ListAdapter(ArrayList<DataNote> data)
        {
            this.dataList = data;
            this.filterlist = new ArrayList(dataList);
        }


@Override
        public int getItemCount()
        {
            return filterlist.size();
        }


        @Override
        public void onBindViewHolder(ListAdapter.ViewHolder holder, final int position)
        {
            holder.textViewBranch.setText(filterlist.get(position).getBranch());
            holder.textViewAsset.setText(filterlist.get(position).getAssetcode());
            holder.textViewCustomer.setText(filterlist.get(position).getCustomer());
            holder.textViewLicense.setText(filterlist.get(position).getLisenceplate());

            holder.btnReceive.setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View v)
                {
                    //Toast.makeText(getActivity(), "Item " + position + " is clicked.", Toast.LENGTH_SHORT).show();
                    Intent intent = new Intent(getActivity(),
                            AssetReceiveActivity.class);
                    intent.putExtra("name",filterlist.get(position).getCustomer());
                    intent.putExtra("code",filterlist.get(position).getAssetcode());
                    intent.putExtra("plat",filterlist.get(position).getLisenceplate());
                    startActivity(intent);
                }
            });
        }

recyclerview上的过滤器功能未显示列表

2 个答案: