如何爲我的自定義適配器實現過濾器？

Question

我一直在試圖添加一個過濾器到我的列表視圖，它顯示了火車站陣列以及相應的GPS座標，專門針對名稱進行過濾。然而，每當我輸入兩個以上的字母時，應用程序似乎崩潰了，因爲索引據說超出了界限。我認爲這是因爲原始的未經過濾的數據集在發佈過濾時會被修改。

如何正確過濾？

@Override 
public Filter getFilter() { 
    return new Filter() { 
     @SuppressWarnings("unchecked") 
     @Override 
     protected void publishResults(CharSequence constraint, FilterResults results) { 
      Log.d("FILTER", "**** PUBLISHING RESULTS for: " + constraint); 
      data = (List<Station>) results.values; 
      StationAdapter.this.notifyDataSetChanged(); 
     } 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      Log.d("FILTER", "**** PERFORM FILTERING for: " + constraint); 
      List<Station> filteredResults = getFilteredResults(constraint); 

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

      return results; 
     } 

     List<Station> getFilteredResults(CharSequence constraint) 
     { 
      List<Station> filteredResult = new ArrayList<Station>(); 

      if(constraint != null) 
      { 
       for(Station s : data) 
       { 
        if(s.getName().toLowerCase().contains(constraint.toString())) 
         filteredResult.add(s); 
       } 
      } 

      return filteredResult; 
     } 
    }; 
} 

在相關情況下，StationAdapter實現了ArrayAdapter。

堆棧跟蹤：

11-29 09:17:52.025: E/AndroidRuntime(21615): FATAL EXCEPTION: main 
11-29 09:17:52.025: E/AndroidRuntime(21615): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1 
11-29 09:17:52.025: E/AndroidRuntime(21615): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at java.util.ArrayList.get(ArrayList.java:304) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at com.liteapps.handin_3.StationAdapter.getView(StationAdapter.java:50) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.AbsListView.obtainView(AbsListView.java:2257) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.ListView.onMeasure(ListView.java:1156) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.View.measure(View.java:15172) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:602) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:415) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.View.measure(View.java:15172) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.View.measure(View.java:15172) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.View.measure(View.java:15172) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2435) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.View.measure(View.java:15172) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.Choreographer.doFrame(Choreographer.java:525) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.os.Handler.handleCallback(Handler.java:615) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.os.Looper.loop(Looper.java:137) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at android.app.ActivityThread.main(ActivityThread.java:4931) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at java.lang.reflect.Method.invokeNative(Native Method) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at java.lang.reflect.Method.invoke(Method.java:511) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 
11-29 09:17:52.025: E/AndroidRuntime(21615): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你需要重寫一個ArrayAdapter類的getCount將（）方法。

 @Override 
    public int getCount() { 
      return YOURLIST.size(); 
    }