Goal: Create a functional login page
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp"
android:orientation="vertical"
tools:context=".LoginActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center"
android:text="Silakan Login"
android:textSize="18dp"
android:fontFamily="sans-serif-medium"
android:layout_marginBottom="8dp"/>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/etUsername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Username"
android:inputType="text|textCapWords"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:passwordToggleEnabled="true">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/etPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Password"
android:inputType="textPassword"/>
</com.google.android.material.textfield.TextInputLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnSubmit"
android:text="Login"
android:textAllCaps="true"
android:onClick="onClickLogin"/>
</LinearLayout>
package id.widiarifki.ntt
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.EditText
import android.widget.Toast
import id.widiarifki.ntt.databinding.ActivityLoginBinding
import id.widiarifki.ntt.model.User
class LoginActivity : AppCompatActivity() {
private lateinit var binding: ActivityLoginBinding
private lateinit var viewUsername: EditText
private lateinit var viewPassword: EditText
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityLoginBinding.inflate(layoutInflater)
setContentView(binding.root)
setupView()
}
private fun setupView() {
viewUsername = binding.etUsername
viewPassword = binding.etPassword
}
fun onClickLogin(view: View) {
if (validateInput()) {
gotoMainScreen()
} else {
showError("Maaf, kombinasi username & password salah")
}
}
private fun validateInput() : Boolean {
val usernameInput = viewUsername.text.toString()
val passwordInput = viewPassword.text.toString()
// Constant username & password stored on a model class called "User"
return usernameInput == User.DEFAULT_USERNAME && passwordInput == User.DEFAULT_PASSWORD
}
private fun gotoMainScreen() {
val intent = Intent(this, MainActivity::class.java)
startActivity(intent)
}
private fun showError(message: String) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show()
}
}