对于android firebase如何通过子元素值的子字符串匹配来查找查找子的查询？

Assume this script:

假设这个脚本：

    private static DatabaseReference;
    mUserDatabase = FirebaseDatabase.getInstance().getReference("Users");


    Query firebaseSearchQuery = mUserDatabase.child("service").orderByChild("serviceName").startAt(searchText).endAt(searchText+"\uf8ff");


    FirebaseRecyclerAdapter<Workers, WorkerViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Workers, WorkerViewHolder>(
            Workers.class,
            R.layout.search_result_layout,
            WorkerViewHolder.class,
            firebaseSearchQuery
    ) {
        @Override
        protected void populateViewHolder(WorkerViewHolder viewHolder, Workers model, int position) {
             viewHolder.setDetails(model.getName(), model.getEmail());
        }
    };
    private