Login

package com.example.petrus.loginregister;

import android.database.sqlite.SQLiteDatabase;
import android.content.Intent;
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.TextView;
import android.widget.Toast;

import java.security.Key;
import java.util.ArrayList;
import java.util.List;

public class LoginActivity extends AppCompatActivity {

    DataHelper dbHelper;
    Button btnA;
    Button btnB;
    EditText editA;
    EditText editB;
    View viewA;
    TextView txtA;
    TextView txtB;
    TextView txtC;
    String username;
    String password;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        dbHelper = new DataHelper(this);
        btnA = findViewById(R.id.btn_login);
        btnB = findViewById(R.id.btn_register);
        editA = findViewById(R.id.txt_username);
        editB = findViewById(R.id.txt_password);
        viewA = findViewById(R.id.View1);
        txtA = findViewById(R.id.TextView1);
        txtB = findViewById(R.id.TextView2);
        txtC = findViewById(R.id.TextView3);

        btnA.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                username = editA.getText().toString();
                password = editB.getText().toString();
                List daftar = new ArrayList();
                Intent i = new Intent(getApplicationContext(),DashboardActivity.class);
                startActivity(i);

            }

        });

        btnB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),RegisterActivity.class);
            startActivity(i);
            }
        });

    }
}