how to search using lowercase in FirebaseRecycleroptions in android java?

问题

MainActivity

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRecyclerView = (RecyclerView)findViewById(R.id.recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        FirebaseRecyclerOptions<DataClass> options = new FirebaseRecyclerOptions.Builder<DataClass>()
                .setQuery(FirebaseDatabase.getInstance().getReference().child("Users"), DataClass.class)
                .build();

        mAdapter = new FirebaseAdapter(options);
        mRecyclerView.setAdapter(mAdapter);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.mainmenu,menu);
        MenuItem item = menu.findItem(R.id.search);
        SearchView searchView = (SearchView)item.getActionView();
        searchView.setMaxWidth(Integer.MAX_VALUE);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String s) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String s) {
                proccessearch(s);
                return true;
            }
        });
        return super.onCreateOptionsMenu(menu);
    }

    private void proccessearch(String s) {

        FirebaseRecyclerOptions<DataClass> options = new FirebaseRecyclerOptions.Builder<DataClass>()
                .setQuery(FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("Name").startAt(s).endAt(s+"\uf8ff"), DataClass.class)
                .build();
        mAdapter = new FirebaseAdapter(options);
        mAdapter.startListening();
        mRecyclerView.setAdapter(mAdapter);
    }
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();
        if (id==R.id.search)
            return true;
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onStart() {
        super.onStart();
        mAdapter.startListening();
    }
    @Override
    protected void onStop() {
        super.onStop();
        mAdapter.stopListening();
    }
}

Now s is the object holding for searchview now how to do that in lowercase I tried s.tolowercase() in startAt and endAt it gives me error, can somebody help me in this one ? how can I search in lowercase in firebaserecycleroptions .......... Thank you.........................................................

来源：https://stackoverflow.com/questions/64990161/how-to-search-using-lowercase-in-firebaserecycleroptions-in-android-java