ListView过滤器：IllegalStateException

Question

为了理智，我在这里张贴这个，因为我确信我现在无法自己解决它。我发布了所有需要了解的内容，因为我想为什么过去没有解决这个问题是因为我没有发布所有内容。到目前为止，我已经剥离了代码，基本上它是尽可能轻的。但仍然出现此错误（尽管非常非常非常罕见）：

03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(16908298, class android.widget.ListView) with Adapter(class de.innosoft.android.mobileserviceclient.activities.ListEinsaetze$ArrayAdapterEinsatz)] 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(16908298, class android.widget.ListView) with Adapter(class de.innosoft.android.mobileserviceclient.activities.ListEinsaetze$ArrayAdapterEinsatz)] 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.ListView.layoutChildren(ListView.java:1544) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.AbsListView.onLayout(AbsListView.java:1994) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.AdapterView.updateEmptyStatus(AdapterView.java:747) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.AdapterView.checkFocus(AdapterView.java:720) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:812) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.AbsListView$AdapterDataSetObserver.onChanged(AbsListView.java:5958) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at de.innosoft.android.mobileserviceclient.ui.DynamicArrayAdapter.notifyDataSetChanged(DynamicArrayAdapter.java:291) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at de.innosoft.android.mobileserviceclient.ui.DynamicArrayAdapter.notifyDataSetChanged(DynamicArrayAdapter.java:268) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at de.innosoft.android.mobileserviceclient.ui.DynamicArrayAdapter$DynamicAdapterFilter.publishResults(DynamicArrayAdapter.java:119) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.os.Looper.loop(Looper.java:137) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at android.app.ActivityThread.main(ActivityThread.java:5039) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at java.lang.reflect.Method.invokeNative(Native Method) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at java.lang.reflect.Method.invoke(Method.java:511) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-27 10:57:27.783: E/java.lang.IllegalStateException(4929): at dalvik.system.NativeStart.main(Native Method) 

在这篇文章的最底部我解释出现此错误时。但首先，代码。我有这个TextWatcher：

edSearch.addTextChangedListener(new TextWatcher() { 
       @Override 
       public void onTextChanged(CharSequence s, int start, int before, int count) { 
       } 

       String text = null; 

       @Override 
       public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
        text = s.toString(); 
       } 

       @Override 
       public void afterTextChanged(final Editable s) { 
        if (text != null && !text.equals(s.toString())) { 
         adapter.getFilter().filter(s.toString()); 
        } 
        text = null; 
       } 
      }); 

这个线程在边线上运行，每200毫秒触发一次textwatcher。我一定是疯了手动测试：

new Thread(new Runnable() { 
      public void run() { 
       Runnable r = new Runnable() { 
        public void run() { 
         dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, 
         KeyEvent.KEYCODE_S)); 
         dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, 
         KeyEvent.KEYCODE_S)); 
        } 
       }; 

       Runnable r2 = new Runnable() { 
        public void run() { 
         dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, 
         KeyEvent.KEYCODE_DEL)); 
         dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, 
         KeyEvent.KEYCODE_DEL)); 
        } 
       }; 
       while (true) { 

        runOnUiThread(r); 
        try { 
         Thread.sleep(200); 
        } catch (InterruptedException e) { 
         ExceptionHandler.handle(e); 
        } 
        runOnUiThread(r2); 
        try { 
         Thread.sleep(200); 
        } catch (InterruptedException e) { 
         ExceptionHandler.handle(e); 
        } 
       } 
      } 
     }).start(); 
    } 

这是我的适配器：

private class ArrayAdapterEinsatz extends DynamicArrayAdapter<Einsatz> { 

     public ArrayAdapterEinsatz(int textViewResourceId) { 
      super(ListEinsaetze.this, textViewResourceId, new ArrayList<Einsatz>()); 
     } 

     @Override 
     public View getView(final int position, View convertView, ViewGroup parent) { 

      Einsatz einsatz = getFilteredItems().get(position); 

      View rowView = convertView; 
      if (rowView == null) { 
       LayoutInflater inflater = ListEinsaetze.this.getLayoutInflater(); 
       rowView = inflater.inflate(R.layout.eintrag_einsatz, null); 
       ViewHolder viewHolder = new ViewHolder(); 

       viewHolder.tvId = (TextView) rowView.findViewById(R.id.eeinsatzid); 
       viewHolder.tvDatumVonbis = (TextView) rowView.findViewById(R.id.eeinsatzvonbis); 
       viewHolder.tvKundenName = (TextView) rowView.findViewById(R.id.eeinsatzkundenname); 
       viewHolder.tvKundenOrt = (TextView) rowView.findViewById(R.id.eeinsatzort); 
       viewHolder.tvEntfernung = (TextView) rowView.findViewById(R.id.eeinsatzentfernung); 
       viewHolder.iveRotate = (ImageViewEffects) rowView.findViewById(R.id.eeinsatzrotate); 
       viewHolder.iveRotate.setBitmap(Utils.drawableToBitmap(R.drawable.ic_refresh_1, 22), ImageViewEffects.ROTATE); 
       viewHolder.ivAnsprechpartnerVorhanden = (ImageView) rowView.findViewById(R.id.eeinsatzimageansprechvorhanden); 
       viewHolder.ivBelegeVorhanden = (ImageView) rowView.findViewById(R.id.eeinsatzimagebelegevorhanden); 
       viewHolder.ivTaetigkeitVorhanden = (ImageView) rowView.findViewById(R.id.eeinsatzimagetaetigkeitvorhanden); 

       rowView.setTag(viewHolder); 
      } 

      final ViewHolder holder = (ViewHolder) rowView.getTag(); 

      return rowView; 
     } 

    } 

最后，这是基本适配器类。注意最底层的实际过滤函数，它根据新的Random（）。nextBoolean（）进行过滤，这不能更简单。

public class DynamicArrayAdapter<T> extends BaseAdapter implements Filterable { 

    public class DynamicAdapterFilter extends Filter { 

    private CharSequence m_Filter = null; 
    private List<T> m_FilteredItems = null; 

    public DynamicAdapterFilter() { 
     m_FilteredItems = new ArrayList<T>(); 
    } 

    @Override 
    protected FilterResults performFiltering(CharSequence constraint) { 


     FilterResults r = new FilterResults(); 
     List<T> items = null; 
     m_Filter = constraint; 

     if (constraint == null) { 
     items = m_AllItems; 
     } else { 
     items = m_FilteredItems; 
     items.clear(); 

     synchronized (SyncLock) { 
      List<T> l = new ArrayList<T>(m_AllItems); 
      for (T item : l) { 
      if (DynamicArrayAdapter.this.filter(item, constraint)) { 
       items.add(item); 
      } 
      } 
     } 
     } 

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

     return r; 
    } 

    @SuppressWarnings("unchecked") 
    @Override 
    protected void publishResults(CharSequence constraint, FilterResults results) { 

     m_Items = (List<T>) results.values; 

     notifyDataSetChanged(); 

    } 

    public void refresh() { 
     if (m_Filter != null) { 

     filter(m_Filter); 
     } 
    } 

    public void refresh(FilterListener listener) { 
     if (m_Filter != null) { 

     filter(m_Filter, listener); 
     } 
    } 
    } 


    private final Object SyncLock = new Object(); 
    private Context m_Context = null; 
    private LayoutInflater m_Inflater = null; 
    private int m_DelegateResourceId; 
    private boolean m_ChangeNotificationsEnabled = true; 
    private List<T> m_AllItems = null; 
    private List<T> m_Items = null; 
    private DynamicAdapterFilter m_Filter = null; 


    public DynamicArrayAdapter(Context context, int delegateResourceId) { 
    this(context, delegateResourceId, new ArrayList<T>()); 
    } 

    public DynamicArrayAdapter(Context context, int delegateResourceId, List<T> items) { 
    m_Context = context; 
    m_DelegateResourceId = delegateResourceId; 
    initItems(items); 

    m_Inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    } 

    public void initItems(List<T> items) { 
    m_AllItems = m_Items = items; 
    } 

    /** 
    * returns the filtered item count (or all item count if no filter exists) 
    */ 
    @Override 
    public int getCount() { 
     return m_Items != null ? m_Items.size() : 0; 
    } 

    /** 
    * returns the item at the position in the filtered list (or all item count if 
    * no filter exists) 
    */ 
    @Override 
    public T getItem(int position) { 
    return m_Items.get(position); 
    } 

    /** 
    * holt position von item, exakte gleiche implementation wie ArrayAdapter<T> 
    * 
    * @param item 
    * @return 
    */ 
    public int getPosition(T item) { 
    return m_Items.indexOf(item); 
    } 

    /** 
    * {@inheritDoc} 
    */ 
    @Override 
    public long getItemId(int position) { 

    return position; 
    } 

    /** 
    * returns the list view item delegate view. this view is inflated if it isn't 
    * already inflated. Override this method to perform custom view operations 
    * for the list view item. 
    */ 
    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView == null) { 
     convertView = m_Inflater.inflate(m_DelegateResourceId, parent, false); 
    } 

    return convertView; 
    } 

    /** 
    * returns the filter. this filter is created if it hasn't yet been created. 
    */ 
    @Override 
    public DynamicAdapterFilter getFilter() { 
    if (m_Filter == null) { 
     m_Filter = new DynamicAdapterFilter(); 
    } 

    return m_Filter; 
    } 

    /** 
    * If notifications are enabled, this notifies the base adapter that the 
    * backing data has changed 
    */ 
    @Override 
    public void notifyDataSetChanged() { 
    notifyDataSetChanged(false); 
    } 

    /** 
    * If forced or notifications are enabled, this notifies the base adapter that 
    * the backing data has changed 
    * 
    * @param force 
    *   force notify even if notifications are disabled 
    */ 
    public void notifyDataSetChanged(boolean force) { 
    if (force || m_ChangeNotificationsEnabled) { 

     super.notifyDataSetChanged(); 
    } 
    } 

    /** 
    * @return UI context 
    */ 
    public Context getContext() { 
    return m_Context; 
    } 

    /** 
    * @return UI inflater 
    */ 
    public LayoutInflater getLayoutInflater() { 
    return m_Inflater; 
    } 

    /** 
    * @return Layout ID of the list view item delegate 
    */ 
    public int getDelegateResourceId() { 
    return m_DelegateResourceId; 
    } 

    /** 
    * @return true if notifications are enabled, false otherwise 
    */ 
    public boolean getChangeNotificationsEnabled() { 
    return m_ChangeNotificationsEnabled; 
    } 

    /** 
    * Set whether notifications are enabled or not 
    */ 
    public void setChangeNotificationsEnabled(boolean value) { 
    m_ChangeNotificationsEnabled = value; 
    } 

    // internal mechanism to handle automagical updates of the list items 
    private void onDataChange() { 


    if (m_Filter == null) { 
     notifyDataSetChanged(); 
    } else { 
     m_Filter.refresh(); 
    } 
    } 

    /** 
    * @return All (unfiltered) items 
    */ 
    public List<T> getAllItems() { 
    return m_AllItems; 
    } 

    /** 
    * Set the backing list 
    */ 
    public void setAllItems(List<T> value) { 
    m_AllItems = value; 

    onDataChange(); 
    } 

    /** 
    * @return Current filtered items, or all items if there is no filter 
    */ 
    public List<T> getFilteredItems() { 
    return m_Items; 
    } 

    public void add(T item) { 
    synchronized (SyncLock) { 
     m_AllItems.add(item); 
    } 

    onDataChange(); 
    } 

    public void insert(T item, int index) { 
    synchronized (SyncLock) { 
     m_AllItems.add(index, item); 
    } 

    onDataChange(); 
    } 

    public void remove(T item) { 
    synchronized (SyncLock) { 
     m_AllItems.remove(item); 
    } 

    onDataChange(); 
    } 

    public void removeAt(int index) { 
    synchronized (SyncLock) { 
     m_AllItems.remove(index); 
    } 

    onDataChange(); 
    } 

    public void clear() { 
    synchronized (SyncLock) { 
     m_AllItems.clear(); 
    } 

    onDataChange(); 
    } 

    public void sort(Comparator<? super T> comparator) { 
    synchronized (SyncLock) { 
     Collections.sort(m_Items, comparator); 
    } 

    onDataChange(); 
    } 

    protected boolean filter(T item, CharSequence constraint) { // AR 
    return new Random().nextBoolean(); 

    } 
} 

所以基本上，程序每隔200毫秒触发一次textwatcher。所以textwatcher一次又一次地过滤列表。节目中没有别的东西在欢呼。

如果我没有设置断点，程序运行正常，没有错误总是。

的错误，当我断点的行

adapter.getFilter().filter(s.toString()); 

在TextWatcher并按住F8（继续）按下发生时（这似乎把不规则性引入程序流程，我只能想象吗？）。没有断点，不会发生错误。

而且顺便说一句，如果我把

adapter.notifyDatasetChanged() 

后

adapter.getFilter().filter(s.toString()); 

同样的错误发生的时间（我知道notifyDatasetChanged被称为publishResults 100％，所以我不 吨需要它，但它是否正确的行为？）。

TL; DR：

是我的代码（尤其是基础适配器代码）故障？ （当然不能是别的不会发生错误）

编辑：

错误也没有时，设置断点我刚刚得到一个时...

Answer 1

尝试移动你的

adapter.getFilter().filter(s.toString()); 

在可运行的行中使用view.post（）进入ui线程。

它“可能”解决您的问题。

Answer 2

不要添加一个textwatcher而只是将适配器设置为如下所示的编辑文本。

edSearch.setAdapter（adapter）;

并覆盖public Filter getFilter（）和 protected void publishResults（CharSequence contraint，FilterResults results）
方法。

这将带您problem..Faced的护理同样的问题，它解决这样:)