Login Activity

package com.rplsnapan.e_attendance.activities;

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

import com.rplsnapan.e_attendance.R;
import com.rplsnapan.e_attendance.apihelper.ApiClient;
import com.rplsnapan.e_attendance.models.LoginResponse;
import com.rplsnapan.e_attendance.models.User;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;


public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    EditText etUsername, etPassword;
    private Button btLogin;
    private User dataUser;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        etUsername = findViewById(R.id.edt_loginusername);
        etPassword = findViewById(R.id.edt_loginpassword);
        btLogin = findViewById(R.id.btn_login);
        findViewById(R.id.btn_login).setOnClickListener(this);

    }


    private void userLogin() {
        String username = etUsername.getText().toString().trim();
        String password = etPassword.getText().toString().trim();

        if (username.isEmpty()) {
            Toast.makeText(this, "Username is wrong!!", Toast.LENGTH_SHORT).show();
            etUsername.setError("Username Required");
            etUsername.requestFocus();
        }
        if (password.isEmpty()) {
            Toast.makeText(this, "Password is wrong!!", Toast.LENGTH_SHORT).show();
            etPassword.setError("Password Required");
            etPassword.requestFocus();
        }

        Call<LoginResponse> call = ApiClient.getInstance().getApi().userLogin(username, password);

        call.enqueue(new Callback<LoginResponse>() {
            @Override
            public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
                LoginResponse loginResponse = response.body();

                if (loginResponse.getStatus() == 200) {

                    Toast.makeText(LoginActivity.this, loginResponse.getMessage(), Toast.LENGTH_LONG).show();
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    intent.putExtra("NAMA",dataUser.getName());
                    startActivity(intent);

                } else {
                    Toast.makeText(LoginActivity.this, loginResponse.getMessage(), Toast.LENGTH_LONG).show();
                    btLogin.setVisibility(View.VISIBLE);
                }
            }

            @Override
            public void onFailure(Call<LoginResponse> call, Throwable t) {
                Toast.makeText(LoginActivity.this, "" + t, Toast.LENGTH_LONG).show();
                btLogin.setVisibility(View.VISIBLE);
            }
        });
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_login:
                btLogin.setVisibility(view.INVISIBLE);
                userLogin();
                break;
        }
    }
}