kuliah pemrograman android untuk kasus login page

MainActivity.java

package com.example.presentasi.loginpage;

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

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    Button buttonLogin;
    EditText editTextEmail, editTextPassword;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editTextEmail = (EditText) findViewById(R.id.editTextEmail);
        editTextPassword = (EditText) findViewById(R.id.editTextPwd);
        buttonLogin = (Button) findViewById(R.id.buttonLogin);

        buttonLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                processLogin();
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();

        SharedPreferences sharedPreferences = getSharedPreferences("temporary_data",0);
        boolean isLogin = sharedPreferences.getBoolean("is_login",false);
        if (isLogin){
            Intent nextPageIntent = new Intent(this, DashboardActivity.class);
            startActivity(nextPageIntent);
            finish();
        }

    }

    private void processLogin() {
        String email = editTextEmail.getText().toString();
        String password = editTextPassword.getText().toString();

        if (email.equalsIgnoreCase("[email protected]") && password.equalsIgnoreCase("qqq")){

            SharedPreferences sharedPreferences = getSharedPreferences("temporary_data",0);
            sharedPreferences.edit().putBoolean("is_login",true).commit();

            Intent nextPageIntent = new Intent(this, DashboardActivity.class);
            startActivity(nextPageIntent);
            finish();
        }
    }
}