Intro to Android Development
  • Welcome
  • Syllabus
  • Hack Challenge
  • Resources
    • Lecture Videos
    • Ed Discussion
    • Git & GitHub Help/How-To
    • Setting up Android Studio
    • Starting an Android Studio Project & Making an Emulator
    • Importing, Exporting, & Submitting Your Projects to CMS
  • SP25 Course Material
    • Week 1 | Course Logistics, Kotlin, & Basic UI
      • Relevant Links
      • Demo/Lecture: Eatery Card
      • A0: Eatery Card (Follow-Along)
    • Week 2 | States, Components, LazyColumn
      • Relevant Links
      • Demo: Todo List
      • A2: Shopping List
    • Week 3 | Navigation & Animations
      • Relevant Links
      • Demo: Onboarding
      • A3: Stock Trading (RobbingGood)
    • Week 4 | MVVM and Flows
      • Relevant Links
      • A4: Chat of a Lifetime
    • Week 5 | Dumb Components & UIEvents
      • Relevant Links
      • A5: Rate My Vibe
    • Week 6 | Coroutines, Networking, JSON
      • Relevant Links
      • A6: You Should Even Lift, Bro.
  • Textbook
    • 1. Introduction to the Editor and Views
      • 1.1 Introduction to the Editor
      • 1.2 SDK Management
      • 1.3 Kotlin Overview
      • 1.4 Views
      • 1.5 Android Studio Project Demo + Understanding The Editor
    • 2. Jetpack Compose
      • 2.1 Introduction
      • 2.2 Layouts
      • 2.3 Modifiers
      • 2.4 Animations
      • 2.5 Lazy Lists
      • 2.6 Reactive UI
    • 3. Intents and Manifest
      • 3.1 Activities
      • 3.2 Implicit Intents
      • 3.3 Explicit Intents
      • 3.4 Manifest
      • 3.5 Permissions
      • 3.6 Summary
    • 4. Navigation
      • 4.1 Types of Navigation
      • 4.2 Implementation of the Bottom Navigation Bar
    • 5. Data and Persistent Storage
      • 5.1 Singleton Classes
      • 5.2 Shared Preferences
      • 5.3 Rooms
      • 5.4 Entities
      • 5.5 Data Access Objects
      • 5.6 Databases
    • 5.5 Concurrency
      • 5.5.1 Coroutines
      • 5.5.2 Implementation of Coroutines
      • 5.5.3 Coroutines with Networking Calls
    • 6. Networking and 3rd Party libraries
      • 6.1 HTTP Overview
      • 6.2 3rd Party Libraries
      • 6.3 JSON and Moshi
      • 6.4 Retrofit
      • 6.5 Summary
    • 7. MVVM Design Pattern
      • 7.1 Key Idea
      • 7.2 Implementation Ideas
    • 8. Flows
    • 9. The Art and Ontology of Software
    • 10. 🔥 Firebase
      • 10.1 Setting up Firebase
      • 10.2 Authentication
      • 10.3 Analytics
      • 10.4 Messaging
      • 10.5 Firestore
  • Additional Topics
    • Git and GitHub
    • Exporting to APK
  • Archive
    • Archived Native Android Textbook Pages
      • 1. Layouts and More Views
        • 1.1 File Structure and File Types
        • 1.2 Resource Files
        • 1.3 Button and Input Control
        • 1.4 ViewGroups
        • 1.5 Summary + A Note On Chapter 2 Topics
      • 2. RecyclerViews
        • 2.1 RecyclerViews
        • 2.2 RecyclerView Performance
        • 2.3 Implementation of a Recycler View
        • 2.4 Implementation with Input Controls
        • 2.5 Filtering RecyclerViews
        • 2.6 Recyclerview Demo
      • 3. ListViews and Searching
        • 3.1 ListView vs. RecyclerView
        • 3.2 ListView Performance
        • 3.3 Implementation of a ListView
        • 3.4 Searching in a List View
      • 4. Fragments
        • 4.1 What are Fragments?
        • 4.2 Lifecycle of a Fragment
        • 4.3 Integrating a Fragment into an Activity
        • 4.4 Sharing Data Between Fragments
        • 4.5 Fragment Slide Shows
      • 5. OkHttp
      • 6. Activity Lifecycle
      • 7. Implementation of Tab Layout
    • Fall 2024 Course Material
      • Lecture 1 & Exercise 1: Introduction to Android
      • Lecture 1.5: Beauty of Kotlin
      • Lecture 2 & HW 2: Modifiers, Lazylists and Reactive UI
      • Lecture 3 & HW 3: Animations, Intents and Manifest
      • Lecture 4 & HW 4: Coroutines & Navigation
      • Lecture 5 & HW 5: Persistent Storage, Networking, and JSON Parsing
      • Lecture 6 & HW 6: MVVM, Flows
      • Bonus Lectures & Bonus HW
      • Bonus Lecture: Industry Practice
    • Spring 2024 Course Material
      • Lecture 1 & Exercise 1: Introduction to Android
      • Lecture 4 & HW 4: LazyLists
      • Lecture 6 & HW 6: Networking, Data, and Persistent Storage
    • Spring 2020 Course Material
      • Week 1: Intro to the Editor
      • Week 2: Views and Layouts
      • Week 3: Intent and Manifest
      • Week 4: ListView and RecyclerView
      • Week 5: Fragments
      • Week 6: Networking
    • Spring 2021 Lecture & HW 8: Networking & 3rd Party APIs
    • HackOurCampus Workshop
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  1. SP25 Course Material

Week 2 | States, Components, LazyColumn

Apps need their UI to change to be at all useful...

In week 2, we'll learn how to leverage states to get our UI to show important data, build components to enforce good coding practice, and use LazyColumns to up our layout game!

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