/AndroidActivityFundamentals

Primary LanguageKotlinMIT LicenseMIT

Android Activity Life Cycle Example

This project demonstrates the Activity Life Cycle in Android, showcasing how activities transition through different states during their lifecycle. It includes two activities (MainActivity and SecondActivity) to illustrate activity navigation and how lifecycle methods are triggered in response to user actions and system events.

Table of Contents

Overview

Understanding the Activity Life Cycle is crucial for Android app development. Activities are the core building blocks of Android apps, and their lifecycle methods allow developers to manage resources efficiently, handle user interactions, and ensure a smooth app experience.

This project includes:

  1. Lifecycle Logging: Each lifecycle method is logged to Logcat to observe how the lifecycle transitions.
  2. Activity Navigation: Demonstrates starting a second activity from the main activity.
  3. Hands-On Interaction: Encourages students to test lifecycle methods by rotating the screen, pressing the home button, or navigating between activities.

Key Concepts

  • Activity Life Cycle:

    • onCreate: Initialize the activity.
    • onStart: Make the activity visible.
    • onResume: Start interacting with the user.
    • onPause: Pause user interaction (e.g., another activity partially obscures it).
    • onStop: Stop visibility (e.g., navigating to another activity).
    • onRestart: Restart after being stopped.
    • onDestroy: Clean up resources when the activity is destroyed.

  • Activity Navigation:

    • Using Intent to start a new activity.

  • Testing Lifecycle Transitions:

    • Rotate the device to trigger onPause, onStop, and onDestroy.
    • Press the home button to see onPause and onStop.
    • Reopen the app to observe onRestart.

Project Structure

|-- app/  
    |-- src/  
        |-- main/  
            |-- java/com/idz/androidactivityfundamentals/ 
                |-- MainActivity.kt  # Main activity with full lifecycle methods  
                |-- SecondActivity.kt  # A secondary activity to demonstrate navigation  
            |-- res/  
                |-- layout/  
                    |-- activity_main.xml  # Layout for MainActivity  
                    |-- activity_second.xml  # Layout for SecondActivity  
                |-- values/  
                    |-- strings.xml  # App string resources  
    |-- AndroidManifest.xml  # App manifest with both activities registered

Setup Instructions

  1. Clone this repository to your local machine: git clone https://github.com/your-username/activity-lifecycle-example.git

  2. Open the project in Android Studio.

  3. Sync Gradle by clicking "Sync Now" when prompted.

  4. Run the project on an emulator or physical device.

How to Test

  1. Logging Lifecycle Events:

    • Open Logcat in Android Studio.
    • Filter logs by ActivityLifecycle to view lifecycle events for both activities.

  2. Navigate Between Activities:

    • Launch the app.
    • Click the "Go to Second Activity" button in MainActivity to start SecondActivity.

  3. Trigger Lifecycle Events:

    • Rotate the device to trigger configuration changes.
    • Press the home button and reopen the app to observe onPause, onStop, and onRestart.
    • Close the app to observe onDestroy.

  4. Understand Logs:

    • Check Logcat to see the order in which lifecycle methods are called.

Key Learning Outcomes

  1. Understand how Activity Life Cycle works in Android.
  2. Learn how to navigate between activities using Intent.
  3. Observe and analyze lifecycle transitions using Logcat.
  4. Apply lifecycle methods to manage resources efficiently.

Contributing

Contributions are welcome! If you have suggestions for improving this project or extending it with new features, feel free to submit a pull request.

License

This project is licensed under the MIT License. You can find the full license text here.