Week 5 Update: Navigation & Authentication - Codeman239/TruckMate GitHub Wiki

## Overview
In Week 5, I established in‑app navigation and created a simple login flow. This lays the groundwork for secured areas of TruckMate and a modular screen structure.

## 1. Project Rename  
- Updated `settings.gradle.kts`:
  ```kotlin
  rootProject.name = "TruckMate"

• Switched to version‑catalog alias(...) for core plugins:

  plugins {
      alias(libs.plugins.android.application)
      alias(libs.plugins.kotlin.android)
      alias(libs.plugins.kotlin.compose)
      id("kotlin-kapt")                // no catalog alias available
  }

• Added Navigation dependencies:

  implementation("androidx.navigation:navigation-fragment-ktx:2.7.0")
  implementation("androidx.navigation:navigation-ui-ktx:2.7.0")

Created app/src/main/res/navigation/nav_graph.xml:

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_graph"
    app:startDestination="@id/loginFragment">

    <fragment
        android:id="@+id/loginFragment"
        android:name="com.codyhassey.truckmate.LoginFragment"
        android:label="Login">
        <action
            android:id="@+id/action_login_to_home"
            app:destination="@id/homeFragment" />
    </fragment>

    <fragment
        android:id="@+id/homeFragment"
        android:name="com.codyhassey.truckmate.HomeFragment"
        android:label="Home" />

</navigation>

All UI XML lives in app/src/main/res/layout/:

• activity_main.xml Hosts the NavHostFragment:

  <?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"
      tools:context=".MainActivity">
  
      <fragment
          android:id="@+id/nav_host_fragment"
          android:name="androidx.navigation.fragment.NavHostFragment"
          android:layout_width="0dp"
          android:layout_height="0dp"
          app:defaultNavHost="true"
          app:navGraph="@navigation/nav_graph"
          app:layout_constraintTop_toTopOf="parent"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintEnd_toEndOf="parent" />
  
  </androidx.constraintlayout.widget.ConstraintLayout>

• fragment_login.xml Two EditText (username, password) + Button:

  <?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"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
  
      <EditText
          android:id="@+id/etUsername"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:hint="Username"
          app:layout_constraintTop_toTopOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          android:layout_margin="16dp" />
  
      <EditText
          android:id="@+id/etPassword"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:hint="Password"
          android:inputType="textPassword"
          app:layout_constraintTop_toBottomOf="@id/etUsername"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          android:layout_margin="16dp" />
  
      <Button
          android:id="@+id/btnLogin"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Log In"
          app:layout_constraintTop_toBottomOf="@id/etPassword"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          android:layout_marginTop="24dp" />
  
  </androidx.constraintlayout.widget.ConstraintLayout>

• fragment_home.xml Simple TextView welcome message:

  <?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"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
  
      <TextView
          android:id="@+id/tvWelcome"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Welcome to TruckMate!"
          android:textSize="24sp"
          app:layout_constraintTop_toTopOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          android:layout_marginTop="32dp" />
  
  </androidx.constraintlayout.widget.ConstraintLayout>

• MainActivity.kt

  package com.codyhassey.truckmate
  
  import android.os.Bundle
  import androidx.appcompat.app.AppCompatActivity
  import androidx.navigation.findNavController
  import androidx.navigation.ui.setupActionBarWithNavController
  
  class MainActivity : AppCompatActivity() {
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.activity_main)
  
          val navController = findNavController(R.id.nav_host_fragment)
          setupActionBarWithNavController(navController)
      }
  
      override fun onSupportNavigateUp() =
          findNavController(R.id.nav_host_fragment).navigateUp() || super.onSupportNavigateUp()
  }

• LoginFragment.kt & HomeFragment.kt See full implementations in the app/src/main/java/com/codyhassey/truckmate/ directory.