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AdManager.kt

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+package com.example.myapp.presentation.ads
+
+import android.content.Context
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
+import com.example.myapp.domain.model.AdNetworkStrategy
+
+class AdManager(private val context: Context, private val strategy: AdNetworkStrategy) {
+
+    private val handler = Handler(Looper.getMainLooper())
+    private val TAG = "AdManager"
+
+    fun initializeAds() {
+        when (strategy) {
+            AdNetworkStrategy.IRANIAN_ADS -> Log.d(TAG, "[IRANIAN_ADS] Initializing Iranian Ads SDK (e.g., Tapsell)")
+            AdNetworkStrategy.GLOBAL_ADS -> Log.d(TAG, "[GLOBAL_ADS] Initializing Global Ads SDK (e.g., AdMob/Google Ad Manager)")
+            AdNetworkStrategy.UNKNOWN -> Log.d(TAG, "[UNKNOWN] No specific ad strategy, defaulting or waiting.")
+        }
+        // Actual SDK initialization would happen here
+    }
+
+    // --- Rewarded Video Ads ---
+    fun loadRewardedVideoAd(onLoaded: () -> Unit, onFailed: () -> Unit) {
+        Log.d(TAG, "[$strategy] Loading Rewarded Video Ad...")
+        // Simulate ad loading delay
+        handler.postDelayed({
+            val success = Math.random() > 0.2 // Simulate 80% success rate
+            if (success) {
+                Log.d(TAG, "[$strategy] Rewarded Video Ad Loaded.")
+                onLoaded()
+            } else {
+                Log.e(TAG, "[$strategy] Rewarded Video Ad Failed to Load.")
+                onFailed()
+            }
+        }, 2000) // 2-second delay
+    }
+
+    fun showRewardedVideoAd(onRewarded: (rewardAmount: Int) -> Unit, onClosed: () -> Unit) {
+        Log.d(TAG, "[$strategy] Showing Rewarded Video Ad...")
+        // Simulate ad showing and reward
+        handler.postDelayed({
+            val rewardAmount = 100 // Dummy reward
+            Log.d(TAG, "[$strategy] Rewarded Video Ad: User Rewarded with $rewardAmount coins.")
+            onRewarded(rewardAmount)
+
+            handler.postDelayed({
+                Log.d(TAG, "[$strategy] Rewarded Video Ad Closed.")
+                onClosed()
+            }, 500) // Short delay for closing
+        }, 1500) // 1.5-second delay for ad "viewing"
+    }
+
+    // --- Interstitial Ads ---
+    fun loadInterstitialAd(onLoaded: () -> Unit, onFailed: () -> Unit) {
+        Log.d(TAG, "[$strategy] Loading Interstitial Ad...")
+        handler.postDelayed({
+            val success = Math.random() > 0.2 // Simulate 80% success rate
+            if (success) {
+                Log.d(TAG, "[$strategy] Interstitial Ad Loaded.")
+                onLoaded()
+            } else {
+                Log.e(TAG, "[$strategy] Interstitial Ad Failed to Load.")
+                onFailed()
+            }
+        }, 2000) // 2-second delay
+    }
+
+    fun showInterstitialAd(onClosed: () -> Unit) {
+        Log.d(TAG, "[$strategy] Showing Interstitial Ad...")
+        handler.postDelayed({
+            Log.d(TAG, "[$strategy] Interstitial Ad Shown and Closed.")
+            onClosed()
+        }, 1500) // 1.5-second delay
+    }
+}

AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.example.myapp">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MyApp"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="portrait"> {/* Requirement: Portrait-only mode */}
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

Particle.kt

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+package com.example.myapp.presentation.model
+
+import android.graphics.Color
+
+data class Particle(
+    var x: Float,
+    var y: Float,
+    var color: Int,
+    var radius: Float,
+    var xSpeed: Float,
+    var ySpeed: Float,
+    var alpha: Int = 255,
+    var lifetime: Int // e.g., in frames or milliseconds
+) {
+    companion object {
+        // Predefined rainbow colors for Rainbow Burst effect
+        val RAINBOW_COLORS = listOf(
+            Color.RED, Color.rgb(255, 165, 0), Color.YELLOW, // Orange
+            Color.GREEN, Color.BLUE, Color.rgb(75, 0, 130), // Indigo
+            Color.rgb(128, 0, 128) // Violet
+        )
+    }
+}

Skin.kt

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+package com.example.myapp.domain.model
+
+import androidx.annotation.DrawableRes
+
+data class Skin(
+    val id: String,
+    val name: String,
+    @DrawableRes val iconResId: Int, // For displaying the skin in a list
+    var isUnlocked: Boolean,
+    val unlockCost: Int, // 0 if unlocked by default or through non-coin means
+    // Potentially, add fields for actual visual assets if not just a color tint
+    // e.g., val mainColor: Int? = null, val detailColor: Int? = null, val spriteName: String? = null
+)

SkinAdapter.kt

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+package com.example.myapp.presentation.ui
+
+import android.graphics.Color
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.example.myapp.R
+import com.example.myapp.domain.model.Skin
+
+class SkinAdapter(
+    private val onUnlockClicked: (skin: Skin) -> Unit,
+    private val onSelectClicked: (skin: Skin) -> Unit
+) : ListAdapter<Skin, SkinAdapter.SkinViewHolder>(SkinDiffCallback()) {
+
+    private var currentCoins: Int = 0
+    private var selectedSkinId: String? = null
+
+    fun setCurrentCoins(coins: Int) {
+        currentCoins = coins
+        // notifyDataSetChanged() // Could be inefficient, better to handle in bind or use payloads
+    }
+
+    fun setSelectedSkinId(skinId: String?) {
+        selectedSkinId = skinId
+        notifyDataSetChanged() // Necessary to update selection highlights
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SkinViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_skin, parent, false) // item_skin.xml needs to be created
+        return SkinViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: SkinViewHolder, position: Int) {
+        val item = getItem(position)
+        holder.bind(item, currentCoins, selectedSkinId == item.id, onUnlockClicked, onSelectClicked)
+    }
+
+    class SkinViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val nameTextView: TextView = itemView.findViewById(R.id.skinNameTextView)
+        private val iconImageView: ImageView = itemView.findViewById(R.id.skinIconImageView)
+        private val actionButton: Button = itemView.findViewById(R.id.skinActionButton)
+        private val itemLayout: View = itemView // For background tinting if selected
+
+        fun bind(
+            skin: Skin,
+            currentCoins: Int,
+            isSelected: Boolean,
+            onUnlockClicked: (skin: Skin) -> Unit,
+            onSelectClicked: (skin: Skin) -> Unit
+        ) {
+            nameTextView.text = skin.name
+            iconImageView.setImageResource(skin.iconResId) // Placeholder icons
+
+            if (isSelected) {
+                itemLayout.setBackgroundColor(Color.LTGRAY) // Highlight selected
+                actionButton.text = "Selected"
+                actionButton.isEnabled = false
+            } else {
+                itemLayout.setBackgroundColor(Color.TRANSPARENT) // Default background
+                if (skin.isUnlocked) {
+                    actionButton.text = "Select"
+                    actionButton.isEnabled = true
+                    actionButton.setOnClickListener { onSelectClicked(skin) }
+                } else {
+                    actionButton.text = "Unlock (${skin.unlockCost})"
+                    actionButton.isEnabled = currentCoins >= skin.unlockCost
+                    actionButton.setOnClickListener { onUnlockClicked(skin) }
+                }
+            }
+        }
+    }
+
+    class SkinDiffCallback : DiffUtil.ItemCallback<Skin>() {
+        override fun areItemsTheSame(oldItem: Skin, newItem: Skin): Boolean {
+            return oldItem.id == newItem.id
+        }
+
+        override fun areContentsTheSame(oldItem: Skin, newItem: Skin): Boolean {
+            return oldItem == newItem
+        }
+    }
+}

SkinsActivity.kt

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+package com.example.myapp.presentation.ui
+
+import android.media.AudioAttributes
+import android.media.SoundPool
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProvider
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.example.myapp.R
+import com.example.myapp.domain.model.Skin
+
+class SkinsActivity : AppCompatActivity() {
+
+    private lateinit var viewModel: MainViewModel
+    private lateinit var skinsRecyclerView: RecyclerView
+    private lateinit var skinAdapter: SkinAdapter // To be created
+    private lateinit var currentCoinsTextView: TextView
+    private lateinit var backButton: Button
+
+    private var soundPool: SoundPool? = null
+    private var buttonClickSoundId: Int = 0
+    private var itemUnlockedSoundId: Int = 0
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_skins)
+
+        viewModel = ViewModelProvider(this).get(MainViewModel::class.java)
+
+        currentCoinsTextView = findViewById(R.id.currentCoinsTextViewSkins)
+        backButton = findViewById(R.id.backButtonSkins)
+
+        setupSoundPool()
+        loadSounds()
+        setupRecyclerView()
+        observeViewModel()
+
+        backButton.setOnClickListener {
+            playSound(buttonClickSoundId)
+            finish()
+        }
+    }
+
+    private fun setupRecyclerView() {
+        skinsRecyclerView = findViewById(R.id.skinsRecyclerView)
+        skinAdapter = SkinAdapter(
+            onUnlockClicked = { skin ->
+                playSound(buttonClickSoundId)
+                if (viewModel.unlockSkin(skin.id)) {
+                    playSound(itemUnlockedSoundId)
+                    Toast.makeText(this, "${skin.name} Unlocked!", Toast.LENGTH_SHORT).show()
+                } else {
+                    Toast.makeText(this, "Not enough coins or already unlocked!", Toast.LENGTH_SHORT).show()
+                }
+            },
+            onSelectClicked = { skin ->
+                playSound(buttonClickSoundId)
+                viewModel.selectSkin(skin.id)
+                Toast.makeText(this, "${skin.name} Selected!", Toast.LENGTH_SHORT).show()
+                // Adapter will update based on LiveData observation for selected state
+            }
+        )
+        skinsRecyclerView.adapter = skinAdapter
+        // Using GridLayoutManager for a more skin-selection friendly UI
+        skinsRecyclerView.layoutManager = GridLayoutManager(this, 3) // 3 items per row
+    }
+
+    private fun observeViewModel() {
+        viewModel.objectSkins.observe(this, Observer { skins ->
+            skinAdapter.submitList(skins)
+        })
+
+        viewModel.currentCoins.observe(this, Observer { coins ->
+            currentCoinsTextView.text = "Coins: $coins"
+            skinAdapter.setCurrentCoins(coins)
+            // Could call notifyDataSetChanged or more specific updates if needed for button states
+        })
+
+        viewModel.selectedSkinId.observe(this, Observer { selectedId ->
+            skinAdapter.setSelectedSkinId(selectedId)
+            // Adapter needs to handle highlighting the selected item
+        })
+    }
+
+    private fun setupSoundPool() {
+        val audioAttributes = AudioAttributes.Builder()
+            .setUsage(AudioAttributes.USAGE_ASSISTANCE_SONIFICATION)
+            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
+            .build()
+        soundPool = SoundPool.Builder()
+            .setMaxStreams(2)
+            .setAudioAttributes(audioAttributes)
+            .build()
+    }
+
+    private fun loadSounds() {
+        soundPool?.let {
+            buttonClickSoundId = it.load(this, R.raw.button_click, 1)
+            itemUnlockedSoundId = it.load(this, R.raw.upgrade_purchased, 1) // Re-use upgrade sound for unlock
+        }
+    }
+
+    private fun playSound(soundId: Int) {
+        if (soundId > 0) {
+            soundPool?.play(soundId, 0.8f, 0.8f, 1, 0, 1f)
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        soundPool?.release()
+        soundPool = null
+    }
+}