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改进这个问题
这是logcat显示我有问题的方法。更具体地说，它是第74行和第71行。我用粗体和斜体突出显示了这两行，只是为了更简单。我错过了什么？

private void showData() {
        query = firestore.collection("tasks").orderBy("time" , Query.Direction.DESCENDING);

      ***listenerRegistration = query.addSnapshotListener(new EventListener<QuerySnapshot>() {***
            @Override
            public void onEvent(@Nullable QuerySnapshot value, @Nullable FirebaseFirestoreException error) {
              ***for (DocumentChange documentChange : value.getDocumentChanges()){***
                    if (documentChange.getType() == DocumentChange.Type.ADDED){
                        String id = documentChange.getDocument().getId();
                        ToDoModel toDoModel = documentChange.getDocument().toObject(ToDoModel.class).withId(id);
                        mList.add(toDoModel);
                        adapter.notifyDataSetChanged();
                    }
                }
                listenerRegistration.remove();

            }
        });

错误日志：

2021-07-07 14:06:05.099 20857-20857/com.example.poe E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.poe, PID: 20857
    java.lang.AssertionError
        at com.example.poe.ListPokemon$2.onEvent(ListPokemon.java:74)
        at com.example.poe.ListPokemon$2.onEvent(ListPokemon.java:71)
        at com.google.firebase.firestore.Query.lambda$addSnapshotListenerInternal$2$Query(Query.java:1126)
        at com.google.firebase.firestore.-$$Lambda$Query$JWhMgzcsIac1Z-exZj1pTDRisJg.onEvent(Unknown Source:6)
        at com.google.firebase.firestore.core.AsyncEventListener.lambda$onEvent$0$AsyncEventListener(AsyncEventListener.java:42)
        at com.google.firebase.firestore.core.-$$Lambda$AsyncEventListener$DNkggu2LY54oguDvcp-QtRg6Sfg.run(Unknown Source:6)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)