getFilter() 不适用于 ListAdapter

Posted 2023-05-07

【中文标题】getFilter() 不适用于 ListAdapter

【英文标题】：getFilter() is not working with ListAdapter

【发布时间】：2016-12-01 13:11:39

【问题描述】：

我想过滤使用 volley 填充的 Listview。我正在使用 ListAdapter 和 SimpleAdapter 来填充 listView 并且它工作正常......但是当我在 editText 上实现 TEXTWATCHER 并添加 getFilter()给它...它给人一种空气（无法解析方法'getFilter（）'）

帮帮我...我如何过滤我的列表？ 代码如下...

import android.app.ProgressDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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

public class grabedDb extends AppCompatActivity 
EditText grabResults;
String url = "http://MY_URL_HERE";
ArrayList<HashMap<String, String>> Item_List;
ProgressDialog PD;
ArrayAdapter adapter;

// JSON Node names
public static final String ITEM_ID = "name";
public static final String ITEM_NAME = "rate";

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_grabed_db);
    grabResults = (EditText) findViewById(R.id.grabed_et_search);
    grabResults.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) 
            //perform Search
            if (s.toString().equals(""))
                //Reset List
                ReadDataFromDB();
             else 
                grabedDb.this.adapter.getFilter().filter(s);
            
        

        @Override
        public void afterTextChanged(Editable s) 

        
    );

    Item_List = new ArrayList<HashMap<String, String>>();

    PD = new ProgressDialog(this);
    PD.setMessage("Please Wait...");
    PD.setCancelable(false);

    ReadDataFromDB();


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

private void ReadDataFromDB() 
    PD.show();
    JsonObjectRequest jreq = new JsonObjectRequest(Request.Method.GET, url,
            new Response.Listener<JSONObject>() 

                @Override
                public void onResponse(JSONObject response) 
                    try 
                        int success = response.getInt("success");

                        if (success == 1) 
                            JSONArray ja = response.getJSONArray("mydrugs");

                            for (int i = 0; i < ja.length(); i++) 

                                JSONObject jobj = ja.getJSONObject(i);
                                HashMap<String, String> item = new HashMap<String, String>();
                                item.put(ITEM_ID, jobj.getString(ITEM_ID));
                                item.put(ITEM_NAME,
                                        jobj.getString(ITEM_NAME));

                                Item_List.add(item);

                             // for loop ends

                            String[] from =  ITEM_ID, ITEM_NAME ;
                            int[] to =  R.id.item_name, R.id.item_id ;

                            adapter = new SimpleAdapter(
                                    getApplicationContext(), Item_List,
                                    R.layout.list_items, from, to);

                            ListView myList = (ListView) findViewById(R.id.list_list_listView);
                            myList.setAdapter(adapter);
                            PD.dismiss();
                            myList.setOnItemClickListener(new AdapterView.OnItemClickListener()
                                @Override
                                public void onItemClick(AdapterView<?> parent, View view, int position,
                                                        long id) 

                                    Intent modify_intent = new Intent(grabedDb.this,
                                            updatedata.class);

                                    modify_intent.putExtra("item", Item_List.get(position));

                                    startActivity(modify_intent);

                                
                            );
                         // if ends

                     catch (JSONException e) 
                        e.printStackTrace();
                    

                
            , new Response.ErrorListener() 

        @Override
        public void onErrorResponse(VolleyError error) 
            PD.dismiss();
        
    );

    // Adding request to request queue
    MyApplication.getInstance().addToReqQueue(jreq);

【参考方案1】：

我认为将 ListAdapter 与 SimpleAdapter 一起使用不是很好的选择...您必须将 ListAdapter 替换为 SimpleAdapter...

它对我有用...