I've an Activity with a EditText (named "filtro") and a ListView (named "list_view"). When the user inserts text, the adapter should be refresh; if i change text many times, comes a crash followed by the message "Make sure the content of your adapter is not modified from a background thread, but only from the UI thread"
listener :
filtro.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
Log.d(TAG, "onTextChanged(" + cs + ")");
adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});
}
adapter:
public class ArticoliAdapter extends BaseAdapter implements Filterable { [...]
@Override
public View getView(int position, View convertView, ViewGroup parent) {
[...]
}
@Override
public Filter getFilter() {
if(mFilter == null)
mFilter = new CustomFilter();
return mFilter;
}
private class CustomFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (index == null) {
synchronized (mLock) {
index = new ArrayList<Long>();
}
}
else {
index.clear();
}
[...some controls...]
if(flag_controls) {
index.add(new Long(i));
categoria_vuota = false;
continue;
}
}
filtered = true;
synchronized (mLock) {
results.values = index;
results.count = index.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
notifyDataSetChanged();
if (results.count == 0)
notifyDataSetInvalidated();
else {
index = (ArrayList<Long>) results.values;
notifyDataSetChanged();
}
}
}
ErrorLog:
12-03 16:53:26.527: D/AndroidRuntime(15434): Shutting down VM
12-03 16:53:26.527: W/dalvikvm(15434): threadid=1: thread exiting with uncaught exception (group=0x416052a0)
12-03 16:53:26.543: E/AndroidRuntime(15434): FATAL EXCEPTION: main
12-03 16:53:26.543: E/AndroidRuntime(15434): 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(2131230967, class android.widget.ListView) with Adapter(class it.losi.ordcliagent.ArticoliAdapter)]
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.ListView.layoutChildren(ListView.java:1538)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.AbsListView.onLayout(AbsListView.java:2300)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.View.layout(View.java:14061)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewGroup.layout(ViewGroup.java:4374)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.onLayout(LinearLayout.java:1426)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.View.layout(View.java:14061)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewGroup.layout(ViewGroup.java:4374)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.View.layout(View.java:14061)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewGroup.layout(ViewGroup.java:4374)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.LinearLayout.onLayout(LinearLayout.java:1426)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.View.layout(View.java:14061)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewGroup.layout(ViewGroup.java:4374)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.View.layout(View.java:14061)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewGroup.layout(ViewGroup.java:4374)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1986)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1807)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4464)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.Choreographer.doFrame(Choreographer.java:525)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.os.Handler.handleCallback(Handler.java:615)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.os.Handler.dispatchMessage(Handler.java:92)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.os.Looper.loop(Looper.java:137)
12-03 16:53:26.543: E/AndroidRuntime(15434): at android.app.ActivityThread.main(ActivityThread.java:4895)
12-03 16:53:26.543: E/AndroidRuntime(15434): at java.lang.reflect.Method.invokeNative(Native Method)
12-03 16:53:26.543: E/AndroidRuntime(15434): at java.lang.reflect.Method.invoke(Method.java:511)
12-03 16:53:26.543: E/AndroidRuntime(15434): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
12-03 16:53:26.543: E/AndroidRuntime(15434): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
12-03 16:53:26.543: E/AndroidRuntime(15434): at dalvik.system.NativeStart.main(Native Method)
SOLUTION With the control if(Looper.myLooper() == Looper.getMainLooper()) i've understand that the method performFiltering() generate automatically a new thread.
I created a new method called "filtra()" for forcing the code to use the MainTread:
public class CustomFilter extends Filter {
public void filtra(final CharSequence constraint) {
activity.runOnUiThread(new Runnable() {
public void run() {
publishResults(constraint, eseguiAggiornamento(constraint));
}});
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
return eseguiAggiornamento(constraint);
}
private FilterResults eseguiAggiornamento(CharSequence constraint) {
[...code...]
}
}
your listView and editText are on the same layout? if the editText is on a dialog or something, it's possible that you are changing the text that is affecting the list from a different thread. wrap your update to the adapter with:
runOnUiThread(new Runnable() {
public void run() {
adapter...
}
});
来源：https://stackoverflow.com/questions/20355497/make-sure-the-content-of-your-adapter-is-not-modified-from-a-background-thread