正気を保つために、ここに投稿しています。今は自分で解決できないと確信しているためです。過去にこの問題の解決策が得られなかったのは、すべてを投稿しなかったためだと思うので、知っておくべきことをすべて投稿しています。基本的に可能な限り軽量になるように、これまでコードを削除しました。しかし、それでもこのエラーが発生します (非常にまれですが):
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)
この投稿の一番下で、このエラーがいつ発生するかを説明します。でもまずはコード。私はこのTextWatcherを持っています:
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;
}
});
このスレッドはサイドラインで実行され、200 ミリ秒ごとに textwatcher をトリガーします。これを手動でテストするのはクレイジーです：
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();
}
これは私のアダプターです:
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;
}
}
最後に、これは基本アダプター クラスです。一番下にある実際のフィルター関数に注目してください。これは new Random().nextBoolean() に従ってフィルター処理されますが、これはこれ以上単純ではありません。
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();
}
}
したがって、基本的に、プログラムは 200 ミリ秒ごとに textwatcher をトリガーするだけです。そのため、textwatcher はリストを何度もフィルタリングします。プログラムでは、他に何も起こっていません。
ブレークポイントを設定しないと、プログラムは常にエラーなしで正常に実行されます。
行をブレークポイントするとエラーが発生します
adapter.getFilter().filter(s.toString());
TextWatcher で F8 (続行) を押したままにします (これはプログラム フローに不規則性をもたらすようですが、想像することしかできません)。ブレークポイントがなければエラーは発生しません。
ところで、私が置くと
adapter.notifyDatasetChanged()
後
adapter.getFilter().filter(s.toString());
同じエラーが 100% 発生します (notifyDatasetChanged が publishResults で呼び出されることはわかっているので、必要ありませんが、それでも正しい動作ですか?)。
TL;DR:
コード (特に基本アダプター コード) はフェイルセーフですか? (それ以外の場合、エラーは発生しません)
編集：
ブレークポイントが設定されていない場合にもエラーが発生します。