Login Activity

import android.content.Intent
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_login.*


class LoginActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)
        supportActionBar?.hide()

        btn_login.setOnClickListener {
            prosesLogin()
        }
    }

    private fun prosesLogin(){

        if(!validate()){
            return
        }

        var textEmail = input_email.text.toString()
        var textPassword = input_password.text.toString()

        if(textEmail == "[email protected]" && textPassword == "admin123"){

            Toast.makeText(this, "Berhasil login", Toast.LENGTH_SHORT).show()
            var intent = Intent(this, ListActivity::class.java)
            startActivity(intent)
            finish()

        } else {

            Toast.makeText(this, "Email atau password yang Anda masukan salah!", Toast.LENGTH_SHORT).show()

        }
    }

    fun validate():Boolean{

        var valid = true

        var email = input_email.text.toString()
        var password = input_password.text.toString()

        if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
            input_email.setError("Enter a valid email address")
            input_email.requestFocus()
            valid = false
        } else {
            input_email.setError(null)
        }

        if (password.isEmpty() || password.length < 4 || password.length > 10) {
            input_password.setError("between 4 and 10 alphanumeric characters")
            input_password.requestFocus()
            valid = false
        } else {
            input_password.setError(null)
        }
        return valid
    }
}