Android - Firebase获取另一个表中的所有数据

DatabaseReference indexRef = FirebaseDatabase.getInstance().getReference().child("indexTable");
indexRef.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
            String dataKey = childSnapshot.getKey();
            DatabaseReference dataRef = FirebaseDatabase.getInstance().getReference().child("dataTable").child(dataKey);
            dataRef.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    // 处理获取到的数据
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    // 处理取消获取数据的情况
                }
            });
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        // 处理取消获取索引数据的情况
    }
});