当数据到达 ArrayAdapter 时我的问题列表视图没有更新到最后一个数据我必须转到另一个页面并返回更新列表视图问题列表视图未自动更新
我在此代码中的操作是，当在 firebase 上更新数据时，我将该数据插入 arraylist 并将 arraylist 放入 arrayAdapter 中，然后我启动应用程序它的工作，如果我将另一个数据添加到我的数据库中并转到另一个页面并返回我的应用程序上的列表视图显示最后的数据没有任何问题，但是当我留在列表视图上时，当新数据出现并触及任何列表视图时，应用程序继续崩溃并且 IllegalStateException 来请对我的问题有任何帮助，对不起我英语不是很好，我希望你理解这个问题，我使用 mvvm 设计模式我的代码
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
groupfragmentview = inflater.inflate(R.layout.fragment_group, container, false);
list_View = (ListView) groupfragmentview.findViewById(R.id.list_view);
//
myview = ViewModelProvider.AndroidViewModelFactory.getInstance(getActivity().getApplication()).create(group_frg_view.class);
myview.init();
myview.getgroup().observe(this.getActivity(), new Observer<group_frg_model>() {
@Override
public void onChanged(final group_frg_model group_frg_model) {
updateUI(group_frg_model);
list_View.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String groupname = parent.getItemAtPosition(position).toString();
String groupid= group_frg_model.getGroupid().get(position);
String TAG=null;
Log.d(TAG,"name " + groupid);
Intent groupintent = new Intent(getContext(),GroupChatActivity.class);
groupintent.putExtra("groupname",groupname);
groupintent.putExtra("groupid",groupid);
startActivity(groupintent);
}
});
}
});
return groupfragmentview;
}
private void updateUI(group_frg_model group_frg_model) {
array_Adapter = new ArrayAdapter<>(getActivity(), R.layout.single_row_group_list, R.id.group_name,group_frg_model.getGroupname());
list_View.setAdapter(array_Adapter);
list_View.requestLayout();
array_Adapter.notifyDataSetChanged();
}
非法状态异常
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. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131230911, class android.widget.ListView) with Adapter(class android.widget.ArrayAdapter)]
at android.widget.ListView.layoutChildren(ListView.java:1618)
at android.widget.AbsListView.onTouchUp(AbsListView.java:4013)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3806)
at android.view.View.dispatchTouchEvent(View.java:9943)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2663)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2344)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:411)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1810)
at android.app.Activity.dispatchTouchEvent(Activity.java:3061)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:373)
at android.view.View.dispatchPointerEvent(View.java:10163)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4434)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4302)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3995)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4052)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6210)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6184)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6145)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6313)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:323)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)