update: rotating screen

app/src/main/java/com/example/nerbos/MainActivity.kt

 package com.example.nerbos
 
 import android.content.Intent
+import android.content.res.Configuration
 import android.os.Bundle
+import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import com.example.nerbos.databinding.ActivityMainBinding
@@ -14,9 +16,22 @@ import com.example.nerbos.service.TokenCheckService
 
 class MainActivity : AppCompatActivity() {
 
+    private val fragments = mapOf(
+        R.id.transaction to TransactionFragment(),
+        R.id.scan to ScanFragment(),
+        R.id.statistic to StatisticFragment(),
+        R.id.user to UserFragment()
+    )
+    private val fragmentTitles = mapOf(
+        R.id.transaction to R.string.navbar_transaction,
+        R.id.scan to R.string.navbar_scan,
+        R.id.statistic to R.string.navbar_statistic,
+        R.id.user to R.string.navbar_user
+    )
+
+    private var selectedItemId: Int = R.id.transaction
     internal lateinit var binding: ActivityMainBinding
     internal lateinit var networkManager: NetworkManager
-    private var currentFragmentId: Int = R.id.transaction
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -30,60 +45,41 @@ class MainActivity : AppCompatActivity() {
         val serviceIntent = Intent(this, TokenCheckService::class.java)
         startService(serviceIntent)
 
-        supportActionBar?.title = getString(R.string.navbar_transaction)
-        replaceFragment(TransactionFragment())
-
-        binding.bottomNavigationView.setOnItemSelectedListener {
-            currentFragmentId = it.itemId // Store the selected fragment ID
-            when (it.itemId) {
-                R.id.transaction -> {
-                    replaceFragment(TransactionFragment())
-                    supportActionBar?.title = getString(R.string.navbar_transaction)
-                }
-                R.id.scan -> {
-                    replaceFragment(ScanFragment())
-                    supportActionBar?.title = getString(R.string.navbar_scan)
-                }
-                R.id.statistic -> {
-                    replaceFragment(StatisticFragment())
-                    supportActionBar?.title = getString(R.string.navbar_statistic)
-                }
-                R.id.user -> {
-                    replaceFragment(UserFragment())
-                    supportActionBar?.title = getString(R.string.navbar_user)
-                }
-            }
-            true
+        // Restore the selected item if there is a saved instance
+        if (savedInstanceState != null) {
+            selectedItemId = savedInstanceState.getInt(getString(R.string.selected_item_id))
         }
-    }
 
-    fun getCurrentFragmentId(): Int {
-        return currentFragmentId
-    }
+        setupNavigation()
 
-    fun getFragmentFromId(id: Int): Fragment {
-        return when (id) {
-            R.id.transaction -> TransactionFragment()
-            R.id.scan -> ScanFragment()
-            R.id.statistic -> StatisticFragment()
-            R.id.user -> UserFragment()
-            else -> TransactionFragment()
-        }
+        // Set selected item
+        selectMenuItem(selectedItemId)
     }
 
-    fun getTitleFromId(id: Int): Int {
-        return when (id) {
-            R.id.transaction -> R.string.navbar_transaction
-            R.id.scan -> R.string.navbar_scan
-            R.id.statistic -> R.string.navbar_statistic
-            R.id.user -> R.string.navbar_user
-            else -> R.string.navbar_transaction
+    private fun setupNavigation() {
+        if (resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+            binding.bottomNavigationView?.setOnItemSelectedListener { item ->
+                selectMenuItem(item.itemId)
+                true
+            }
+            binding.bottomNavigationView?.selectedItemId = selectedItemId
+        } else {
+            binding.navigationView?.setNavigationItemSelectedListener { item ->
+                selectMenuItem(item.itemId)
+                true
+            }
+            binding.navigationView?.setCheckedItem(selectedItemId)
         }
     }
 
-    fun showActionBarAndNavBar() {
-        supportActionBar?.show()
-        binding.bottomNavigationView.visibility = android.view.View.VISIBLE
+    private fun selectMenuItem(itemId: Int) {
+        val item = binding.bottomNavigationView?.menu?.findItem(itemId)
+            ?: binding.navigationView?.menu?.findItem(itemId)
+        item?.let {
+            supportActionBar?.title = it.title
+            replaceFragment(fragments[itemId]!!)
+            selectedItemId = itemId
+        }
     }
 
     internal fun replaceFragment(fragment: Fragment) {
@@ -93,8 +89,30 @@ class MainActivity : AppCompatActivity() {
         fragmentTransaction.commit()
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putInt(getString(R.string.selected_item_id), selectedItemId)
+        super.onSaveInstanceState(outState)
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         networkManager.unregisterNetworkCallback()
     }
-}
\ No newline at end of file
+
+    fun getCurrentFragmentId(): Int {
+        return selectedItemId
+    }
+
+    fun getFragmentFromId(id: Int): Fragment {
+        return fragments[id] ?: TransactionFragment()
+    }
+
+    fun getTitleFromId(id: Int): Int {
+        return fragmentTitles[id] ?: R.string.navbar_transaction
+    }
+
+    fun showActionBarAndNavBar() {
+        supportActionBar?.show()
+        binding.bottomNavigationView?.visibility ?:  View.VISIBLE
+    }
+}

app/src/main/java/com/example/nerbos/service/Authentication.kt

@@ -75,7 +75,8 @@ class Authentication(private val context: Context) {
     fun getEmail(): String {
         val sharedPreferences : SharedPreferences =
             context.getSharedPreferences(context.getString(R.string.preferences), Context.MODE_PRIVATE)
-        return sharedPreferences.getString(context.getString(R.string.email), "") ?: ""
+        // if no email in shared preferences, return default value
+        return sharedPreferences.getString(context.getString(R.string.email), "13521000@std.stei.itb.ac.id") ?: ""
     }
 
     fun getNim(): Int {

app/src/main/java/com/example/nerbos/service/NetworkManager.kt

@@ -69,7 +69,7 @@ class NetworkManager(private val context: Context) {
 
     private fun hideActionBarAndNavBar(mainActivity: MainActivity) {
         mainActivity.supportActionBar?.hide()
-        mainActivity.binding.bottomNavigationView.visibility = View.GONE
+        mainActivity.binding.bottomNavigationView?.visibility ?: View.GONE
     }
 
     fun handleCloseButtonClick() {

app/src/main/res/layout-land/activity_main.xml

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:background="@color/primary_bg"
+    tools:context=".MainActivity">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appBarLayout"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:background="@color/primary_bg"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="40dp"
+            android:background="@color/header_bg"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
+            app:titleTextColor="@color/white">
+
+        </androidx.appcompat.widget.Toolbar>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <FrameLayout
+        android:id="@+id/frameLayout"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/navigationView"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/appBarLayout">
+
+    </FrameLayout>
+
+    <com.google.android.material.navigation.NavigationView
+        android:id="@+id/navigationView"
+        android:layout_width="78dp"
+        android:layout_height="0dp"
+
+        android:background="@color/primary_bg"
+        app:elevation="1dp"
+        app:itemBackground="@color/navbar_bg"
+        app:itemIconTint="@color/navbar_icon"
+        app:itemTextColor="@color/navbar_icon"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="1.0"
+        app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
+        app:layout_constraintVertical_bias="1.0"
+        app:menu="@menu/bottom_navbar">
+
+    </com.google.android.material.navigation.NavigationView>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/values-v31/themes.xml

 <resources xmlns:tools="http://schemas.android.com/tools">
-    <!-- Base application theme. -->
-    <style name="Base.Theme.NerbOS" parent="Theme.Material3.DayNight.NoActionBar">
+<!-- Base application theme. -->
+<!--    <style name="Base.Theme.NerbOS" parent="Theme.Material3.DayNight.NoActionBar">-->
 <!--    <style name="Base.Theme.NerbOS" parent="Theme.MaterialComponents.DayNight.NoActionBar">-->
-<!--    <style name="Base.Theme.NerbOS" parent="Theme.Material3.Dark.NoActionBar">-->
+    <style name="Base.Theme.NerbOS" parent="Theme.Material3.Dark.NoActionBar">
         <!-- Customize your dark theme here. -->
         <!-- Customize your light theme here. -->
         <!-- <item name="colorPrimary">@color/my_light_primary</item> -->

app/src/main/res/values/strings.xml

@@ -6,6 +6,7 @@
     <string name="navbar_scan">Scan</string>
     <string name="navbar_statistic">Statistics</string>
     <string name="navbar_user">User</string>
+    <string name="selected_item_id">selectedItemId</string>
 
     <string name="login_title">Login</string>
     <string name="login_description">Insert login details</string>