Android：从Firebase数据库获取带有两个ValueEventListener的数据（在Arraylist过期之前设置适配器）

要解决此问题，请移动以下代码行：

PatientSelectionAdapter adapter= new PatientSelectionAdapter(getContext(),name,sicks,hastauid);rv.setAdapter(adapter);rv.setLayoutManager(new LinearLayoutManager(getContext()));

在第二种

onDataChange()

myref.child("users").child(addingpatient.getUserId()).addValueEventListener(new ValueEventListener() {    @Override    public void onDataChange(DataSnapshot dataSnapshot) {        if (dataSnapshot.exists()) { Users patient = dataSnapshot.getValue(Users.class); name.add(patient.getName()+" "+patient.getSurname()); sicks.add(patient.getSicks()); patientuid.add(patient.getUserId());        }        PatientSelectionAdapter adapter= new PatientSelectionAdapter(getContext(),name,sicks,hastauid);        rv.setAdapter(adapter);        rv.setLayoutManager(new LinearLayoutManager(getContext()));    }    @Override    public void onCancelled(DatabaseError error) {}});

发生这种情况是因为

onDataChange()