Remove accent on search using android searchview

Question

I wish that when it was picked up on my listview João were shown João, Joao, joão, joao.

I’m using a searchview, I read something about Normalizer but n understood very well.

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.busca, menu);

        MenuItem menuItem = menu.findItem(R.id.sv);

        SearchView searchView = (SearchView) menuItem.getActionView();
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                arrayAdapter.getFilter().filter(newText);
                return true;
            }
        });

        getMenuInflater().inflate(R.menu.activity_main, menu);
        return super.onCreateOptionsMenu(menu);

    }

Answer 1

Do it like this:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater menuInflater = getMenuInflater();
    menuInflater.inflate(R.menu.busca, menu);

    MenuItem menuItem = menu.findItem(R.id.sv);

    SearchView searchView = (SearchView) menuItem.getActionView();
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
        //Irá tirar não só acentuações mas também qualquer caractere fora de ASCII
        String texto;
             texto = Normalizer.normalize(query, Normalizer.Form.NFD).replaceAll("[^\\p{ASCII}]", "");

        //seu código

            return false;
        }

       //se for pra passar o texto já modificado para o arrayAdapter, vc faz:
        @Override
        public boolean onQueryTextChange(String newText) {
             String texto;
             texto = Normalizer.normalize(newText, Normalizer.Form.NFD).replaceAll("[^\\p{ASCII}]", "");

            arrayAdapter.getFilter().filter(texto);
            return true;
        }
    });

    getMenuInflater().inflate(R.menu.activity_main, menu);
    return super.onCreateOptionsMenu(menu);

}

Answer 2

The code of the previous answer works perfectly, however in the case in question it is necessary to convert both this newText String and the String that is inside the Adapter with which you will compare, in my case it was like this:

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.search_only_menu, menu);

        MenuItem searchItem = menu.findItem(R.id.pesquisa_button);
        SearchView searchView = (SearchView) searchItem.getActionView();

        searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);                                       //Troca o botão de buscar para confirmar, já que a busca é em tempo real então não faz muito sentido ter o botão "pesquisar"

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

            @Override
            public boolean onQueryTextChange(String newText) {
                //Convertendo o texto de entrada para caracteres equivalentes sem acentuação, ç etc
                String texto;
                texto = Normalizer.normalize(newText, Normalizer.Form.NFD).replaceAll("[^\\p{ASCII}]", "");
                //Chamando o filter
                clienteAdapter.getFilter().filter(texto);
                return false;
            }
        });

        super.onCreateOptionsMenu(menu, inflater);

    }

And inside the Adapter:

@Override
        protected FilterResults performFiltering(CharSequence constraint) {
            List<ClienteEntity> filteredList = new ArrayList<>();

            if(constraint == null || constraint.length() == 0){
                filteredList.addAll(clientesListaFull);                                             //Quando não há nada digitado na pesquisa, mostramos a lista completa (padrão).
            }else{
                //Trasforma a CharSequence em uma String, coloca tudo minúsculo e remove espaços.
                String filterPattern = constraint.toString().toLowerCase().trim();

                for(ClienteEntity cliente : clientesListaFull){                                     //Percorre cliente por cliente da lista de clientes.
                    String nomeNoASCII;
                    nomeNoASCII = Normalizer.normalize(cliente.getName(), Normalizer.Form.NFD)
                            .replaceAll("[^\\p{ASCII}]", "");
                    if(nomeNoASCII.toLowerCase().contains(filterPattern)){                          //Se a CharSequence digitada estiver contida no cliente.getName, adicionamos esse cliente ao resultado da busca.
                        filteredList.add(cliente);
                    }
                }
            }
            FilterResults results = new FilterResults();
            results.values = filteredList;
            return results;
        }