android: add coil and media3 cache foundation for media

android/CHANGELOG.md

@@ -353,3 +353,8 @@
 - Implemented enqueue + optimistic behavior for `sendText`, `editMessage`, and `deleteMessage` on network failures.
 - Added automatic pending-action flush on chat sync/load-more and before new message operations.
 - Kept non-network server failures as immediate errors (no queueing), while allowing offline continuation.
+
+### Step 60 - Media cache foundation (Coil + Exo cache)
+- Added global Coil image loader cache policy in `MessengerApplication` (memory + disk cache).
+- Added Media3 `SimpleCache` singleton module for media stream/file caching foundation.
+- Added Media3/Coil core dependencies and configured cache sizes for mobile usage.

android/app/build.gradle.kts

@@ -74,7 +74,11 @@ dependencies {
     implementation("androidx.compose.ui:ui:1.7.6")
     implementation("androidx.compose.ui:ui-tooling-preview:1.7.6")
     implementation("androidx.compose.material3:material3:1.3.1")
+    implementation("io.coil-kt:coil:2.7.0")
     implementation("io.coil-kt:coil-compose:2.7.0")
+    implementation("androidx.media3:media3-exoplayer:1.4.1")
+    implementation("androidx.media3:media3-datasource:1.4.1")
+    implementation("androidx.media3:media3-datasource-okhttp:1.4.1")
 
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")

android/app/src/main/java/ru/daemonlord/messenger/MessengerApplication.kt

@@ -1,13 +1,39 @@
 package ru.daemonlord.messenger
 
 import android.app.Application
+import coil.ImageLoader
+import coil.ImageLoaderFactory
+import coil.disk.DiskCache
+import coil.memory.MemoryCache
 import dagger.hilt.android.HiltAndroidApp
 import ru.daemonlord.messenger.core.notifications.NotificationChannels
+import java.io.File
 
 @HiltAndroidApp
-class MessengerApplication : Application() {
+class MessengerApplication : Application(), ImageLoaderFactory {
     override fun onCreate() {
         super.onCreate()
         NotificationChannels.ensureCreated(this)
     }
+
+    override fun newImageLoader(): ImageLoader {
+        val diskCacheDir = File(cacheDir, "coil_images")
+        if (!diskCacheDir.exists()) {
+            diskCacheDir.mkdirs()
+        }
+        return ImageLoader.Builder(this)
+            .memoryCache {
+                MemoryCache.Builder(this)
+                    .maxSizePercent(0.25)
+                    .build()
+            }
+            .diskCache {
+                DiskCache.Builder()
+                    .directory(diskCacheDir)
+                    .maxSizeBytes(250L * 1024L * 1024L)
+                    .build()
+            }
+            .respectCacheHeaders(false)
+            .build()
+    }
 }

android/app/src/main/java/ru/daemonlord/messenger/di/MediaCacheModule.kt

@@ -0,0 +1,37 @@
+package ru.daemonlord.messenger.di
+
+import android.content.Context
+import androidx.media3.database.StandaloneDatabaseProvider
+import androidx.media3.datasource.cache.Cache
+import androidx.media3.datasource.cache.LeastRecentlyUsedCacheEvictor
+import androidx.media3.datasource.cache.SimpleCache
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import java.io.File
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object MediaCacheModule {
+
+    @Provides
+    @Singleton
+    fun provideMediaCache(
+        @ApplicationContext context: Context,
+    ): Cache {
+        val cacheDir = File(context.cacheDir, "exo_media_cache")
+        if (!cacheDir.exists()) {
+            cacheDir.mkdirs()
+        }
+        val maxBytes = 200L * 1024L * 1024L
+        return SimpleCache(
+            cacheDir,
+            LeastRecentlyUsedCacheEvictor(maxBytes),
+            StandaloneDatabaseProvider(context),
+        )
+    }
+}
+

docs/android-checklist.md

@@ -20,7 +20,7 @@
 ## 3. Локальное хранение и sync
 - [x] Room для чатов/сообщений/пользователей
 - [x] DataStore для настроек
-- [ ] Кэш медиа (Coil/Exo cache)
+- [x] Кэш медиа (Coil/Exo cache)
 - [x] Offline-first чтение истории
 - [x] Очередь отложенных действий (send/edit/delete)
 - [x] Конфликт-резолв и reconcile после reconnect