MainActivity.java

package com.okedroid.latihan;

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

public class MainActivity extends AppCompatActivity {

    EditText editText1 ,editText2; //Deklarasi object dari class EdiText
    String text1 ,text2; //Deklarasi object string


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportActionBar().setTitle("User Login Sederhana");
        getSupportActionBar().setSubtitle("okedroid.com");

    }

    public void loginMasuk(View view) {
        //Method onClick pada Button

      editText1 = (EditText)findViewById(R.id.edittext_username);
      editText2 = (EditText) findViewById(R.id.edittext_password);
      text1 = editText1.getText().toString();
      text2 = editText2.getText().toString();

        //Kondisi jika username dan password benar maka akan menampilkan pesan text toast
        //Login sukses dan masuk ke activity 2
      if ((text1.contains("Username"))&&((text2.contains("Password")))) {
          Toast.makeText(this, "Login Sukses", Toast.LENGTH_SHORT).show();
          Intent intent = new Intent(MainActivity.this, SecondActivity.class);
          startActivity(intent);
      }

        else if ((text1.matches("")||text2.matches("")))
          /*
          Atau jika input text 1 dan text 2 kosong
           */
        {
           //Maka akan menampilkan pesan text toast
            Toast.makeText(this, "Isikan Username dan Password", Toast.LENGTH_SHORT).show();

          }

          else {
          //jika kedua kondisi diatas tidak memenuhi

          Toast.makeText(this, "Login Gagal /Username Password Salah", Toast.LENGTH_SHORT).show();
        }

      }


    }