Rewrite demo app with Kotlin, Compose and Clean Architecture

Author: solkin

app/build.gradle

@@ -1,30 +1,69 @@
 apply plugin: 'com.android.application'
+apply plugin: 'org.jetbrains.kotlin.android'
+apply plugin: 'org.jetbrains.kotlin.plugin.compose'
 
 android {
-    compileSdkVersion 34
+    compileSdk 35
     namespace = "com.tomclaw.cache.demo"
+
     defaultConfig {
         applicationId "com.tomclaw.cache.demo"
-        minSdkVersion 21
-        targetSdkVersion 34
-        versionCode 1
-        versionName "1.1"
+        minSdk 21
+        targetSdk 35
+        versionCode 2
+        versionName "2.0"
     }
+
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17
         targetCompatibility JavaVersion.VERSION_17
     }
+
+    kotlinOptions {
+        jvmTarget = '17'
+    }
+
+    buildFeatures {
+        compose true
+    }
 }
 
 dependencies {
-    implementation 'androidx.appcompat:appcompat:1.7.0'
-    implementation 'com.google.android.material:material:1.12.0'
-    implementation 'androidx.recyclerview:recyclerview:1.3.2'
+    // Compose BOM
+    def composeBom = platform('androidx.compose:compose-bom:2024.12.01')
+    implementation composeBom
+
+    // Compose
+    implementation 'androidx.compose.ui:ui'
+    implementation 'androidx.compose.ui:ui-graphics'
+    implementation 'androidx.compose.ui:ui-tooling-preview'
+    implementation 'androidx.compose.material3:material3'
+    implementation 'androidx.compose.material:material-icons-extended'
+
+    // Activity Compose
+    implementation 'androidx.activity:activity-compose:1.9.3'
+
+    // Lifecycle + ViewModel
+    implementation 'androidx.lifecycle:lifecycle-runtime-compose:2.8.7'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.8.7'
+
+    // Coroutines
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0'
+
+    // Core
+    implementation 'androidx.core:core-ktx:1.15.0'
+
+    // Cache library
     implementation project(path: ':cache')
+
+    // Debug
+    debugImplementation 'androidx.compose.ui:ui-tooling'
+    debugImplementation 'androidx.compose.ui:ui-test-manifest'
 }

app/src/main/AndroidManifest.xml

@@ -1,7 +1,6 @@
 <?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.tomclaw.cache.demo">
+    xmlns:tools="http://schemas.android.com/tools">
 
     <application
         android:name=".App"
@@ -10,17 +9,17 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme"
+        android:theme="@android:style/Theme.Material.Light.NoActionBar"
         tools:ignore="GoogleAppIndexingWarning">
         <activity
             android:name=".MainActivity"
-            android:exported="true">
+            android:exported="true"
+            android:theme="@android:style/Theme.Material.Light.NoActionBar">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>
 
-</manifest>
+</manifest>

app/src/main/java/com/tomclaw/cache/demo/App.java

@@ -0,0 +1,53 @@
+package com.tomclaw.cache.demo
+
+import android.app.Application
+import com.tomclaw.cache.DiskLruCache
+import com.tomclaw.cache.demo.data.CacheRepositoryImpl
+import com.tomclaw.cache.demo.domain.repository.CacheRepository
+import com.tomclaw.cache.demo.domain.usecase.AccessFileUseCase
+import com.tomclaw.cache.demo.domain.usecase.AddFileUseCase
+import com.tomclaw.cache.demo.domain.usecase.ClearCacheUseCase
+import com.tomclaw.cache.demo.domain.usecase.DeleteFileUseCase
+import com.tomclaw.cache.demo.domain.usecase.ObserveCacheUseCase
+import com.tomclaw.cache.demo.presentation.ViewModelFactory
+import java.io.File
+import java.io.IOException
+
+class App : Application() {
+
+    lateinit var viewModelFactory: ViewModelFactory
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+
+        val cacheDir = File(filesDir, "lru_cache")
+        val tempDir = cacheDir
+
+        val cache = try {
+            DiskLruCache.create(cacheDir, CACHE_SIZE)
+        } catch (e: IOException) {
+            throw RuntimeException("Failed to create cache", e)
+        }
+
+        val repository: CacheRepository = CacheRepositoryImpl(cache, tempDir)
+
+        val observeCacheUseCase = ObserveCacheUseCase(repository)
+        val addFileUseCase = AddFileUseCase(repository)
+        val accessFileUseCase = AccessFileUseCase(repository)
+        val deleteFileUseCase = DeleteFileUseCase(repository)
+        val clearCacheUseCase = ClearCacheUseCase(repository)
+
+        viewModelFactory = ViewModelFactory(
+            observeCacheUseCase = observeCacheUseCase,
+            addFileUseCase = addFileUseCase,
+            accessFileUseCase = accessFileUseCase,
+            deleteFileUseCase = deleteFileUseCase,
+            clearCacheUseCase = clearCacheUseCase
+        )
+    }
+
+    companion object {
+        private const val CACHE_SIZE = 500L * 1024 // 500 KB
+    }
+}