如何将firebase数据添加到Spinner？

implementation 'com.google.firebase:firebase-database:20.0.0'

DatabaseReference databaseRef = FirebaseDatabase.getInstance().getReference("items");
databaseRef.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        List<String> itemList = new ArrayList<>();
        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
            String item = snapshot.getValue(String.class);
            itemList.add(item);
        }
        // 将数据添加到Spinner适配器
        ArrayAdapter<String> adapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_item, itemList);
        spinner.setAdapter(adapter);
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        // 处理取消事件
    }
});

Spinner spinner = findViewById(R.id.spinner);