我有一个带有EditText的活动(名为"filtro")和一个ListView(名为"list_view").当用户插入文本时,应该刷新适配器; 如果我多次更改文本,则会出现崩溃,然后显示消息"确保未从后台线程修改适配器的内容,但只能从UI线程修改"
听众:
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) { } }); }
适配器:
公共类ArticoliAdapter扩展BaseAdapter实现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(); } } 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 ) results.values; notifyDataSetChanged(); } } }
错误日志:
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)
解决方案 使用控件if(Looper.myLooper()== Looper.getMainLooper())我已经理解方法performFiltering()自动生成一个新线程.
我创建了一个名为"filtra()"的新方法,用于强制代码使用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...] }
}
你的listView和editText在同一个布局上?如果editText位于对话框或其他内容上,则可能是您正在从其他线程更改影响列表的文本.使用以下命令将更新包装到适配器:
runOnUiThread(new Runnable() { public void run() { adapter... } });