我已经为我的项目实现了SearchableSpinner。它在Fragment内部。
我正在使用Realm作为数据库。
在我的onCreateView方法中，我有这个...
@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.ncrdocument, container, false);
realm = Realm.getDefaultInstance();
documents = new ArrayList<>();
documents = realm.where(MaterialDoc.class).findAll();
ArrayAdapter<MaterialDoc> adapter = new ArrayAdapter<>(this.getContext(), android.R.layout.simple_list_item_1, documents);
matList.setAdapter(adapter);
.
.
.
return view;
数据加载正常，可以正确显示它们，但是当我尝试搜索微调器时，我的应用程序崩溃了，并且出现了此错误。
An exception occured during performFiltering()
java.lang.IllegalStateException: Realm access from incorrect thread. Realm objects can only be accessed on the thread they were created
at io.realm.BaseRealm.checkIfValid(BaseRealm.java:383)
at io.realm.MaterialDocRealmProxy.realmGet$document_number(MaterialDocRealmProxy.java:126)
at com.my.application.test.Model.MaterialDoc.getDocumentNumber(MaterialDoc.java:29)
at com.my.application.test.Model.MaterialDoc.toString(MaterialDoc.java:42)
at android.widget.ArrayAdapter$ArrayFilter.performFiltering(ArrayAdapter.java:480)
at android.widget.Filter$RequestHandler.handleMessage(Filter.java:234)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.os.HandlerThread.run(HandlerThread.java:61)
01-09 12:13:06.649 18606-18606/com.my.application.test D/AndroidRuntime: Shutting down VM
01-09 12:13:06.669 18606-18606/com.my.application.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.my.application.test, PID: 18606
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)
at android.widget.AdapterView.checkFocus(AdapterView.java:947)
at android.widget.AdapterView$AdapterDataSetObserver.onInvalidated(AdapterView.java:1070)
at android.widget.AbsListView$AdapterDataSetObserver.onInvalidated(AbsListView.java:8297)
at android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:50)
at android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:59)
at android.widget.ArrayAdapter$ArrayFilter.publishResults(ArrayAdapter.java:513)
at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6939)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
最佳答案
处理跨线程的实数结果时必须小心。领域是由一个不能在另一个线程中使用的线程产生的。因此，请尝试获取结果集的副本（与活动领域实例分离的结果集），然后将此副本提供给适配器。 Realm具有copyFromRealm方法来执行此操作。
像这样修改您的代码
Realm realm = Realm.getDefaultInstance();
RealmResults<MaterialDoc> realmResults = realm.where(MaterialDoc.class).findAll();
List<MaterialDoc> documents = realm.copyFromRealm(realmResults);
ArrayAdapter<MaterialDoc> adapter = new ArrayAdapter<>(this.getContext(), android.R.layout.simple_list_item_1, documents);
matList.setAdapter(adapter);