getFilter() funktioniert nicht mit ListAdapter

Question

Ich möchte meine Listview filtern, die mit Volley bevölkert ist. Ich verwende ListAdapter und SimpleAdapter Listenansicht zu bevölkern und seine adaequat ... aber wenn ich TEXTWATCHER auf editText implementieren und getFilter(), um es hinzuzufügen ... es gibt einen Luft (Die Methode kann nicht lösen ‚getFilter() ')

Hilf mir dabei ... wie kann ich meine Liste filtern? Code ist unten ...

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); 

} 
} 

Answer 1

I ListAdapter mit SimpleAdapter denke, mit nicht gute Wahl ... Sie ListAdapter mit SimpleAdapter ersetzen müssen ...

es funktioniert für mich ...