问：

我正在使用 Firebase-UI 的 FirebaseRecyclerAdapter。我无法在 SearchView 中实现过滤器。

我的数据库：

我的问题：

如何使用FirebaseRecyclerAdapter按字符在FirebaseDatabase中搜索？
（我想按用户名搜索）

我的代码：我使用这种方法进行搜索，我的代码有什么问题？

 mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {

            Query Q = mAllUsersDatabaseRef.child("User").orderByChild("username").startAt(newText).endAt("~");

            FirebaseRecyclerAdapter<User, SearchFeedFragment.AllRegisterUserViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<User, SearchFeedFragment.AllRegisterUserViewHolder>(
                    User.class, R.layout.row_search_all_users, SearchFeedFragment.AllRegisterUserViewHolder.class, Q) {
                @Override
                protected void populateViewHolder( SearchFeedFragment.AllRegisterUserViewHolder viewHolder,User model, int position) {


                    viewHolder.setUserName(model.getUsername());
                    viewHolder.setUserProfilePic(Common.stringToBitMap(model.getProfilepicurl()));

                }
            };
            mRecyclerViewSearch.setAdapter(firebaseRecyclerAdapter);
            return false;
        }
    });


public static class AllRegisterUserViewHolder extends RecyclerView.ViewHolder {

        View mView;

        ImageView mImgProfileImage = (ImageView) itemView.findViewById(R.id.iv_searchProfilePic);
        TextView mTxtProfileName = (TextView) itemView.findViewById(R.id.txt_searchProfileName);

        public AllRegisterUserViewHolder(View itemView) {
            super(itemView);
            itemView = mView;
        }

        public void setUserName(String username) {
            mTxtProfileName.setText(username);
        }

        public void setUserProfilePic(Bitmap image) {
            mImgProfileImage.setImageBitmap(image);
        }
}