What is your knowledge and experience with Core…

Knowledge and experience with Core Android encompass understanding the basic OS components and their interaction with applications.

My experience includes:

Activity and Fragment lifecycle: Deep understanding of lifecycle methods (onCreate, onStart, onResume, onPause, onStop, onDestroy) and managing states during screen rotations, app switching, and activity termination.
Intents and IPC: Using explicit and implicit intents to launch components (Activity, Service, BroadcastReceiver), transfer data, and inter-process communication (IPC).
Services: Creating and managing background tasks with Service, IntentService (deprecated but understood), and WorkManager for persistent background operations.
Broadcast Receivers: Registering and handling system and user broadcast messages.
Content Providers: Interacting with system and user databases, accessing shared data (e.g., contacts, media).
Threads and Concurrency: Working with threads, AsyncTask (deprecated), Handler, Looper, and modern tools like Coroutines for managing asynchronous operations.

Example of Activity lifecycle handling:

// Activity.kt
class MyActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_my)
        // Initialize UI, restore state from savedInstanceState
    }

    override fun onStart() {
        super.onStart()
        // Activity becomes visible
    }

    override fun onResume() {
        super.onResume()
        // Activity comes to foreground, user interaction possible
    }

    override fun onPause() {
        super.onPause()
        // Activity goes to background but still visible (e.g., dialog overlay)
    }

    override fun onStop() {
        super.onStop()
        // Activity is no longer visible
    }

    override fun onDestroy() {
        super.onDestroy()
        // Activity is destroyed
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        // Save state before Activity destruction (e.g., on rotation)
        outState.putString("my_data", "some_value")
    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)
        // Restore state
        val data = savedInstanceState.getString("my_data")
        // Use restored data
    }
}

Understanding these fundamentals is critically important for creating stable and efficient Android applications.

What is your knowledge and experience with Core Android?