📱 Android Labs — Mobile Application Development

Practical assignments from the "Mobile Application Development" course
Environment: Android Studio | Language: Kotlin | Platform: Android 17, API 37

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📂 Repository Structure

Project	Lab	Topic
HelloWorld	Lab 1, 2-3	Platform overview, first app, emulator setup
TwoActivities	Lab 4-5, 6	Activity, Intent, lifecycle
HelloToast	Lab 7-8	Interactive UI, Toast, counter
ContactList	Lab 9	RecyclerView, CardView, Adapter pattern
Scorekeeper	Lab 10-12	Styles, themes, ShapeDrawable

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Projects

HelloWorld — Lab 1, 2-3

First Android app with logging

• ✅ Basic ADB commands (adb devices, adb logcat)
• ✅ Running on Pixel 10 emulator (Android 17, API 37)
• ✅ Logging via Log.d() and Logcat analysis
• ✅ Project structure and Gradle Scripts overview

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    Log.d("MainActivity", "onCreate")
    setContent {
        HelloWorldTheme {
            Greeting("Android! from Sofiia Hunkalo")
        }
    }
}

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TwoActivities — Lab 4-5, 6

Data transfer between screens + Activity Lifecycle

• ✅ Two Activities: MainActivity and SecondActivity
• ✅ Data transfer via explicit Intent and Intent Extras
• ✅ Activity registration in AndroidManifest.xml
• ✅ Full lifecycle logging for both Activities
• ✅ State saving via savedInstanceState
• ✅ Configuration change handling via onConfigurationChanged

// Sending data to SecondActivity
val intent = Intent(this, SecondActivity::class.java)
intent.putExtra(EXTRA_MESSAGE, message)
startActivity(intent)

// Receiving data
val message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE) ?: ""

Lifecycle sequence when navigating between Activities:

MainActivity:   onCreate → onStart → onResume
                    ↓ (SEND button pressed)
MainActivity:   onPause → onStop
SecondActivity: onCreate → onStart → onResume
                    ↓ (Back button pressed)
SecondActivity: onPause → onStop → onDestroy
MainActivity:   onRestart → onStart → onResume

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HelloToast — Lab 7-8

Interactive UI with buttons and a counter

• ✅ Two buttons: TOAST and COUNT
• ✅ Toast notification — "Hello Toast!"
• ✅ Counter with state preserved via remember
• ✅ Yellow background with large number display (160sp)
• ✅ Built entirely with Jetpack Compose

// Show Toast message
Toast.makeText(this, "Hello Toast!", Toast.LENGTH_SHORT).show()

// Counter with Compose state
var count by remember { mutableStateOf(0) }
Button(onClick = { count++ }) {
    Text("COUNT")
}

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ContactList — Lab 9

Contact list with RecyclerView

• ✅ Contact data model (name, phone, image)
• ✅ ContactAdapter with ViewHolder pattern
• ✅ Contact cards using CardView
• ✅ LinearLayoutManager for vertical scrolling list
• ✅ DividerItemDecoration between items
• ✅ Toast notification on contact click

recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = ContactAdapter(contacts) { contact ->
    Toast.makeText(this, "Selected: ${contact.name}", Toast.LENGTH_SHORT).show()
}
recyclerView.addItemDecoration(
    DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
)

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Scorekeeper — Lab 10-12

Score tracking app with themes and styles

• ✅ Two sets of buttons for two teams
• ✅ ShapeDrawable — oval button shapes
• ✅ Custom styles (ScoreButtons, PlusButtons, MinusButtons, ScoreText)
• ✅ DayNight theme with night mode toggle in menu
• ✅ Score persistence via onSaveInstanceState
• ✅ Vector drawable icons (ic_plus, ic_minus)

<style name="ScoreButtons" parent="Widget.AppCompat.Button">
    <item name="android:background">@drawable/button_background</item>
    <item name="android:tint">@color/colorPrimary</item>
</style>

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🛠 Tech Stack

Technology	Usage
Kotlin	Primary programming language
Jetpack Compose	Modern declarative UI (Labs 1–9)
Android Views (XML)	Classic UI layouts (Labs 9–12)
ADB	Command-line debugging tool
Logcat	App log analysis
RecyclerView	Efficient scrollable lists
CardView	Material Design card containers
Intent	Data passing between screens

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📋 Labs Overview

#	Title	Project	Status
Lab 1	Mobile Platform Overview & Environment Setup	HelloWorld	✅ Done
Lab 2-3	Creating a Simple App & Running on Emulator	HelloWorld	✅ Done
Lab 4-5	Working with Activity and Intent	TwoActivities	✅ Done
Lab 6	Activity Lifecycle & State Preservation	TwoActivities	✅ Done
Lab 7-8	Building an Interactive UI	HelloToast	✅ Done
Lab 9	RecyclerView and CardView	ContactList	✅ Done
Lab 10-12	Applying Styles and Themes	Scorekeeper	✅ Done