在自定義適配器中實現getFilter（）

Question

您好我正在寫自定義適配器中的獲取過濾器方法。這是我用getFilter（）的自定義適配器

package com.example.secureapp; 

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

import android.app.Activity; 
import android.content.Context; 
import android.graphics.drawable.Drawable; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.BaseAdapter; 
import android.widget.Filter; 
import android.widget.Filterable; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MyAdapter extends BaseAdapter implements Filterable { 

    private Context context; 
    private int id; 
    private ArrayList<Info> data; 
    private ArrayList<Info> datavalues; 
    private DataFilter filter; 

    public MyAdapter(Context context, int textViewResourceId, List<Info> objects) { 
     this.context = context; 
     this.id = textViewResourceId; 
     this.data = (ArrayList<Info>) objects; 
     datavalues = new ArrayList<Info>(); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View view = convertView; 
     Holder holder = new Holder(); 
     if (view == null) { 
      LayoutInflater i = ((Activity) context).getLayoutInflater(); 
      view = i.inflate(id, parent, false); 
      holder.icon = (ImageView) view.findViewById(R.id.imageView1); 
      holder.name = (TextView) view.findViewById(R.id.textView1); 
      view.setTag(holder); 
     } else { 
      holder = (Holder) view.getTag(); 
     } 
     holder.name.setText(data.get(position).appName); 
     holder.icon.setImageDrawable(data.get(position).icon); 
     return view; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return data.size(); 
    } 

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return data.get(arg0); 
    } 

    @Override 
    public long getItemId(int arg0) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    private class Holder { 
     ImageView icon; 
     TextView name; 
    } 

    @Override 
    public Filter getFilter() { 

     if (filter == null) 
      filter = new DataFilter(); 
     return filter; 
    } 

    private class DataFilter extends Filter { 

     @Override 
     protected void publishResults(CharSequence constraint, 
       FilterResults results) { 
      // TODO Auto-generated method stub 

      data = (ArrayList<Info>) results.values; 
      notifyDataSetChanged(); 
     } 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 

      FilterResults r = new FilterResults(); 

      if (datavalues == null) { 

       synchronized (data) { 
        datavalues = new ArrayList<Info>(data); 
       } 

      } 

      if (constraint == null || constraint.length() == 0) { 

       synchronized (data) { 
        ArrayList<Info> list = new ArrayList<Info>(datavalues); 
        r.values = list; 
        r.count = list.size(); 
       } 

      } else { 

       ArrayList<Info> values = (ArrayList<Info>) datavalues; 
       int count = values.size(); 
       ArrayList<Info> list = new ArrayList<Info>(); 
       String prefix = constraint.toString().toLowerCase(); 

       for (int i = 0; i < count; i++) { 

        if (values.get(i).appName.toLowerCase().contains(prefix)) { 
         list.add(data.get(i)); 
        } 

       } 

       r.values = list; 
       r.count = list.size(); 

      } 

      return r; 

     } 
    } 
} 

方法，但我得到這個例外

FATAL EXCEPTION: main 
08-03 14:36:41.011: E/AndroidRuntime(20938): java.lang.IndexOutOfBoundsException: Invalid index 2, size is 2 
08-03 14:36:41.011: E/AndroidRuntime(20938): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at java.util.ArrayList.get(ArrayList.java:311) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at com.example.secureapp.MyAdapter.getView(MyAdapter.java:46) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.AbsListView.obtainView(AbsListView.java:1427) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.ListView.measureHeightOfChildren(ListView.java:1273) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.ListView.onMeasure(ListView.java:1184) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.View.measure(View.java:8171) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:563) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:378) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.View.measure(View.java:8171) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.View.measure(View.java:8171) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.View.measure(View.java:8171) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.os.Looper.loop(Looper.java:123) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at android.app.ActivityThread.main(ActivityThread.java:4633) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at java.lang.reflect.Method.invokeNative(Native Method) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at java.lang.reflect.Method.invoke(Method.java:521) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
08-03 14:36:41.011: E/AndroidRuntime(20938): at dalvik.system.NativeStart.main(Native Method) 

我沒有得到它，請幫助我！

Answer 1

增加下面`@覆蓋

public int getCount() { 
      return data.size(); 
    } 

低於這個

private ArrayList<Info> data; 

使用單獨的列表過濾數據

private ArrayList<Info> datavalues ; 

你用getFilter函數返回過濾器每一個的新實例而不是創建一個實例。

 @Override 
     public Filter getFilter() { 

     if (filter == null) 
       filter = new DataFilter(); 
     return filter ; 
    } 

     private class DataFilter extends Filter { 

     @Override 
     protected void publishResults(CharSequence constraint, FilterResults results) { 
      // TODO Auto-generated method stub 

      data = (ArrayList<Info>) results.values; 
      notifyDataSetChanged(); 
     } 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 

      FilterResults r = new FilterResults(); 

        if (datavalues == null) { 

        synchronized (data) { 
         datavalues = new ArrayList<Info>(data); 
        } 

       } 

      if (constraint== null || constraint.length() == 0) { 

        synchronized (data) { 
         ArrayList<Info> list = new ArrayList<Info>(datavalues); 
         results.values = list; 
         results.count = list.size(); 
        } 

      } 
      else { 

       ArrayList<Info> values = (ArrayList<Info>)datavalues; 
       int count = values.size(); 
       ArrayList<Info> list = new ArrayList<Info>(); 
       String prefix = constraint.toString().toLowerCase(); 

      for (int i=0; i<count; i++) { 

       if(values.get(i).appName.toLowerCase().contains(prefix)) { 
          list.add(data.get(i)); 
       } 

      } 

      r.values = list; 
      r.count = list.size(); 

      } 

      return r; 

     }