LoginActivity

package com.hpiaia.gestorpro;

import android.content.Intent;
import android.support.annotation.IntegerRes;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.NetworkResponse;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

public class LoginActivity extends AppCompatActivity {

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

        final EditText eUsername = (EditText) findViewById(R.id.eUsername);
        final EditText ePassword = (EditText) findViewById(R.id.ePassword);
        final Button btnLogin = (Button) findViewById(R.id.btnLogin);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                final String username = eUsername.getText().toString();
                final String password = ePassword.getText().toString();

                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject json = new JSONObject(response);

                            Intent intent = new Intent(LoginActivity.this, HomeActivity.class);

                            intent.putExtra("id", json.getInt("id"));
                            intent.putExtra("name", json.getString("name"));
                            intent.putExtra("email", json.getString("email"));
                            intent.putExtra("username", json.getString("username"));
                            intent.putExtra("jwt", json.getString("jwt"));

                            LoginActivity.this.startActivity(intent);

                        } catch (JSONException e) {
                            e.printStackTrace();

                            AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
                            builder.setMessage(response).create().show();
                        }
                    }
                };

                Response.ErrorListener errorListener = new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        NetworkResponse response = error.networkResponse;

                        if (response.statusCode == 402) {
                            AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
                            builder.setMessage("Usuário ou senha inválido(s).").create().show();
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
                            builder.setMessage("Falha ao realizar login.").create().show();
                        }
                    }
                };

                LoginRequest loginRequest = new LoginRequest(username, password, responseListener, errorListener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });
    }
}