mpass | multi-processes socket server for PHP | Socket library

public class Login extends AppCompatActivity {

    private static  String LOGIN_URL = "http://172.26.154.132:75";
    private EditText username;
    private EditText password;
    private Button buttonLogin;
    private ProgressBar loading; 

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

        username = (EditText) findViewById(R.id.input_email1);
        password = (EditText) findViewById(R.id.input_password);
        buttonLogin = (Button) findViewById(R.id.btn_login);
        loading = findViewById(R.id.loading); 

        buttonLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String mEmail = username.getText().toString().trim();
                String mPass = password.getText().toString().trim();

                if(!mEmail.isEmpty() || !mPass.isEmpty()){
                        Login1(mEmail, mPass);

                } else {
                 username.setError("Please insert email");
                 password.setError("Please insert password");
                }

            }
        }); 
    }

    private void Login1(final String username, final String password) {

        loading.setVisibility(View.VISIBLE);
        buttonLogin.setVisibility(View.GONE);

        StringRequest stringRequest = new StringRequest(Request.Method.POST, LOGIN_URL,
                new Response.Listener() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            String success = jsonObject.getString("data");
                            JSONArray jsonArray = jsonObject.getJSONArray("data");

                            if (success.equals("data")) {
                                for (int i = 0; i < jsonArray.length(); i++) {
                                    JSONObject object = jsonArray.getJSONObject(i);

                                    Intent intent = new Intent(Login.this, MainActivity.class);
                                    startActivity(intent);
                                    loading.setVisibility(View.GONE);


                                }
                            }


                        } catch (JSONException e) {
                            e.printStackTrace();
                            loading.setVisibility(View.GONE);
                            buttonLogin.setVisibility(View.VISIBLE);
                            Toast.makeText(Login.this, "error" + e.toString(), Toast.LENGTH_SHORT).show();
                        }

                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                loading.setVisibility(View.GONE);
                buttonLogin.setVisibility(View.VISIBLE);
                Toast.makeText(Login.this, "error" + error.toString(), Toast.LENGTH_SHORT).show();

              }
            })
        {
            @Override
            protected Map getParams() throws AuthFailureError {
                Map params = new HashMap<>();
                params.put("username", username);
                params.put("password", password);
                return params;
            }
        };

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    } 
}