无法解析方法 .getFilter()

Posted 2023-02-26

【中文标题】无法解析方法 .getFilter()

【英文标题】：Can't resolve method .getFilter()

【发布时间】：2020-07-09 22:50:49

【问题描述】：

我似乎无法找到我的适配器的问题，即我无法在 OnQueryTextChange 上使用 .getFilter() 方法。我将我的适配器称为 mAdapter，但没有用于 .getFilter() 的方法。我相信我的适配器存在一些问题，但我花了很长时间才弄清楚。

这是我的适配器

    package Adapters;

import android.com.example.weddingappfinale.MuaView;
import android.com.example.weddingappfinale.R;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageButton;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MuaAdapter extends RecyclerView.Adapter<MuaAdapter.MuaViewHolder> implements Filterable 
    private List<MuaView> mMuaView;
    private List<MuaView> mMuaViewFull;

    public static class MuaViewHolder extends RecyclerView.ViewHolder 
        public ImageButton mImageButton;
        public TextView mTextView1;

        public MuaViewHolder(@NonNull View itemView) 
            super(itemView);
            mImageButton = itemView.findViewById(R.id.mua_imageButton);
            mTextView1 = itemView.findViewById(R.id.mua_title);
        
    

    public MuaAdapter(List<MuaView> muaView) 
        this.mMuaView = muaView;
        mMuaViewFull = new ArrayList<>(muaView);
    

    @NonNull
    @Override
    public MuaViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) 
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.mua_view, parent, false);
        MuaViewHolder mvh = new MuaViewHolder(v);
        return mvh;
    

    @Override
    public void onBindViewHolder(@NonNull MuaViewHolder holder, int position) 
        MuaView currentView = mMuaView.get(position);

        holder.mImageButton.setImageResource(currentView.getImageResource());
        holder.mTextView1.setText(currentView.getText1());
    

    @Override
    public int getItemCount() 
        return mMuaView.size();
    

    @Override
    public Filter getFilter() 
        return MuaFilter;
    

    private Filter MuaFilter = new Filter() 
        @Override
        protected FilterResults performFiltering(CharSequence constraint) 
            List<MuaView> filteredList = new ArrayList<>();

            if (constraint == null || constraint.length() == 0) 
                filteredList.addAll(mMuaViewFull);
             else 
                String filterPattern = constraint.toString().toLowerCase().trim();

                for (MuaView item : mMuaViewFull) 
                    if (item.getText1().toLowerCase().contains(filterPattern)) 
                        filteredList.add(item);
                    
                
            

            FilterResults results = new FilterResults();
            results.values = filteredList;

            return results;
        

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) 
            mMuaView.clear();
            mMuaView.addAll((ArrayList) results.values);
            notifyDataSetChanged();

        
    ;

这是我的活动

    package android.com.example.weddingappfinale;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.inputmethod.EditorInfo;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SearchView;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

import Adapters.MuaAdapter;

public class MuaActivity extends AppCompatActivity 

    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mua_list);

        getSupportActionBar().setTitle("Make Up Artists");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        ArrayList<MuaView> muaView = new ArrayList<>();
        muaView.add(new MuaView(R.drawable.mua_image, "Make Up Artist Pte Ltd"));
        muaView.add(new MuaView(R.drawable.mua_image, "Aake Up Artist Pte Ltd"));
        muaView.add(new MuaView(R.drawable.mua_image, "Lake Up Artist 3Pte Ltd"));
        muaView.add(new MuaView(R.drawable.mua_image, "f Up Artist Pte Ltd"));

        // ArrayList

        mRecyclerView = findViewById(R.id.recycler_view_list);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mAdapter = new MuaAdapter(muaView);

        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(mAdapter);
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.search, menu);

        MenuItem searchItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) searchItem.getActionView();

        searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() 
            @Override
            public boolean onQueryTextSubmit(String query) 
                return false;
            

            @Override
            public boolean onQueryTextChange(String newText) 
                mAdapter.getFilter().filter(newText);
            );
        return true;
        
    

【参考方案1】：

@Override 注释告诉编译器您要覆盖 RecyclerView.Adapter 中的 getFilter 方法 - 但没有这样的方法。删除注释。

// @Override <-- REMOVE THIS
public Filter getFilter() 
    return MuaFilter;

您还需要更改活动中的成员变量声明。

private MuaAdapter mAdapter;

【参考方案2】：

private RecyclerView.Adapter mAdapter;

替换

private MuaAdapter mAdapter;

问题是getFilter方法只存在于MuaAdapter类中，而RecyclerView.Adapte对getFilter一无所知

【讨论】：

非常感谢先生。是的。这是正确的。欣赏它。