Log in to Webservice via Android

Question

And there folks all quiet?

My question is this::

I’m trying to create a login screen on Android and the registered data is in a Mysql database, to establish the communication I have a working Rest Webservice, the question is: I am sending a GET to my server if it finds the data I requested it return me the login and password after I take this data and compare with those that were typed by the user, I believe that this is not the best way to make an authentication. I would like after the login has been done on the next screen to appear the name of the person who logged in.

Follow below my Android client classes:

User class

public class Usuariorest {

private static final String URL_WS = "http://10.1.1.103:8084/ServidorWS/webresources/Usuario/";


public Usuario getUsuario(String login) throws Exception {

     String[] resposta = new Webservice().get(URL_WS+"Usuario/buscarLogin/"+login);

     if (resposta[0].equals("200")) {
         Gson gson = new Gson();
         Usuario usuario = gson.fromJson(resposta[1], Usuario.class);
         return usuario;
     } else {
         throw new Exception(resposta[1]);
     }
}

Webservice class

public class Webservice {

private HttpEntity entity;

public final String[] get(String url) {

     String[] result = new String[2];

     try {
         HttpGet httpget = new HttpGet(url);
         HttpResponse response;
         response = HttpClient.getHttpClientInstace().execute(httpget);
         entity = response.getEntity();

         if (entity != null) {
             result[0] = String.valueOf(response.getStatusLine().getStatusCode());
             InputStream instream = entity.getContent();
             result[1] = toString(instream);
             instream.close();
             Log.i("get", "Resultado para o post JsonPost : " + result[0] + " : " + result[1]);
         }
     } catch (Exception e) {
         Log.e("NGVL", "Falha ao acessar Web service", e);
         //Log.e("NGVL", e.toString(), e);
         result[0] = "0";
         result[1] = "Falha de rede!";
     }
     return result;
    }

Mainactivity

public class Mainactivity extends Activity {

//private String id;
private String login;  
private String senha; 



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


    final EditText editLogin = (EditText) findViewById(R.id.txtLogin);
    final EditText editSenha = (EditText) findViewById(R.id.txtSenha);
    final TextView text = (TextView)findViewById(R.id.textView1);
    Button btnLogar = (Button) findViewById(R.id.butLogar);


    btnLogar.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {       

        AsyncTask<String, Void, Usuario> atBuscaUsuario = new AsyncTask<String, Void, Usuario>() {
        ProgressDialog progressDialog;


        @Override
        protected Usuario doInBackground(String... params) {
            login = editLogin.getText().toString();
            senha = editSenha.getText().toString();
            try {
                //testo se os campos login ou senha estão vazios
                if(editLogin.getText().toString().trim().equals("")){ 
                        gerarToast("Digite um login!");
                }else
                    if(editSenha.getText().toString().trim().equals("")){
                        gerarToast("Digite uma senha!");
                }else{
                    UsuarioREST rest = new UsuarioREST();
                    Usuario usuario = rest.getUsuario(login);
                    return usuario;
                }
            } catch (NumberFormatException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
                gerarToast(e.getMessage());
            }
            return null;
        }


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = ProgressDialog.show(MainActivity.this, "Aguarde", "Efetuando login...");
        }



        @Override
        protected void onPostExecute(Usuario usuario) {
            super.onPostExecute(usuario);

            if (usuario != null) {
                 if(login.equals(usuario.getLogin().toString().trim()) && senha.equals(usuario.getSenha().toString().trim())){
                    Intent i = new Intent(MainActivity.this, PedidosActivity.class);
                    startActivity(i);

                 }else{
                     gerarToast("Senha incorreta!");
                 }
                //text.setText(usuario.getSenha().toString().trim());
            }

            progressDialog.dismiss();
        }
    };
    atBuscaUsuario.execute(login);
}



private void gerarToast(final String msg) {

    MainActivity.this.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG).show();
        }
    });

        }//fim do metodo onClick




    });//fim do evento setOnClickListener

}