playback: use factory pattern

app/src/main/java/org/oxycblt/auxio/AuxioService.kt

@@ -39,15 +39,17 @@ import org.oxycblt.auxio.playback.service.PlaybackServiceFragment
 @AndroidEntryPoint
 class AuxioService :
     MediaBrowserServiceCompat(), ForegroundListener, MusicServiceFragment.Invalidator  {
-    @Inject lateinit var playbackFragment: PlaybackServiceFragment
+    @Inject lateinit var playbackFragmentFactory: PlaybackServiceFragment.Factory
+    private lateinit var playbackFragment: PlaybackServiceFragment
 
     @Inject lateinit var musicFragmentFactory: MusicServiceFragment.Factory
-    lateinit var musicFragment: MusicServiceFragment
+    private lateinit var musicFragment: MusicServiceFragment
 
     @SuppressLint("WrongConstant")
     override fun onCreate() {
         super.onCreate()
-        sessionToken = playbackFragment.attach(this)
+        playbackFragment = playbackFragmentFactory.create(this, this)
+        sessionToken = playbackFragment.token
         musicFragment = musicFragmentFactory.create(this, this, this)
     }
 

app/src/main/java/org/oxycblt/auxio/playback/replaygain/ReplayGainAudioProcessor.kt

@@ -44,12 +44,17 @@ import org.oxycblt.auxio.util.logD
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class ReplayGainAudioProcessor
+class ReplayGainAudioProcessor private constructor(
-@Inject
-constructor(
     private val playbackManager: PlaybackStateManager,
     private val playbackSettings: PlaybackSettings
 ) : BaseAudioProcessor(), PlaybackStateManager.Listener, PlaybackSettings.Listener {
+    class Factory @Inject constructor(
+
+    private val playbackManager: PlaybackStateManager,
+    private val playbackSettings: PlaybackSettings
+    ) {
+        fun create() = ReplayGainAudioProcessor(playbackManager, playbackSettings)
+    }
     private var volume = 1f
         set(value) {
             field = value
@@ -57,7 +62,7 @@ constructor(
             flush()
         }
 
-    fun attach() {
+    init {
         playbackManager.addListener(this)
         playbackSettings.registerListener(this)
     }

app/src/main/java/org/oxycblt/auxio/playback/service/ExoPlaybackStateHolder.kt

@@ -86,10 +86,9 @@ class ExoPlaybackStateHolder(
     var sessionOngoing = false
         private set
 
-    fun attach() {
+    init {
         imageSettings.registerListener(this)
         player.addListener(this)
-        replayGainProcessor.attach()
         playbackManager.registerStateHolder(this)
         playbackSettings.registerListener(this)
         musicRepository.addUpdateListener(this)
@@ -582,13 +581,14 @@ class ExoPlaybackStateHolder(
         private val playbackSettings: PlaybackSettings,
         private val commandFactory: PlaybackCommand.Factory,
         private val mediaSourceFactory: MediaSource.Factory,
-        private val replayGainProcessor: ReplayGainAudioProcessor,
+        private val replayGainProcessorFactory: ReplayGainAudioProcessor.Factory,
         private val musicRepository: MusicRepository,
         private val imageSettings: ImageSettings,
     ) {
         fun create(): ExoPlaybackStateHolder {
             // Since Auxio is a music player, only specify an audio renderer to save
             // battery/apk size/cache size
+            val replayGainProcessor = replayGainProcessorFactory.create()
             val audioRenderer = RenderersFactory { handler, _, audioListener, _, _ ->
                 arrayOf(
                     FfmpegAudioRenderer(handler, audioListener, replayGainProcessor),

app/src/main/java/org/oxycblt/auxio/playback/service/PlaybackServiceFragment.kt

@@ -34,36 +34,38 @@ import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.widgets.WidgetComponent
 
-class PlaybackServiceFragment
+class PlaybackServiceFragment private constructor(
-@Inject
+    private val context: Context,
-constructor(
+    private val foregroundListener: ForegroundListener,
-    @ApplicationContext private val context: Context,
     private val playbackManager: PlaybackStateManager,
-    private val playbackSettings: PlaybackSettings,
+    exoHolderFactory: ExoPlaybackStateHolder.Factory,
-    private val sessionHolderFactory: MediaSessionHolder.Factory,
+    sessionHolderFactory: MediaSessionHolder.Factory,
-    private val widgetComponent: WidgetComponent,
+    widgetComponentFactory: WidgetComponent.Factory,
-    exoHolderFactory: ExoPlaybackStateHolder.Factory
+    systemReceiverFactory: SystemPlaybackReceiver.Factory,
 ) : MediaSessionCompat.Callback(), PlaybackStateManager.Listener {
+    class Factory @Inject constructor(
+        private val playbackManager: PlaybackStateManager,
+        private val exoHolderFactory: ExoPlaybackStateHolder.Factory,
+        private val sessionHolderFactory: MediaSessionHolder.Factory,
+        private val widgetComponentFactory: WidgetComponent.Factory,
+        private val systemReceiverFactory: SystemPlaybackReceiver.Factory,
+    ) {
+        fun create(context: Context, foregroundListener: ForegroundListener) =
+            PlaybackServiceFragment(context, foregroundListener, playbackManager, exoHolderFactory, sessionHolderFactory, widgetComponentFactory, systemReceiverFactory)
+    }
+
     private val waitJob = Job()
     private val exoHolder = exoHolderFactory.create()
-    private var foregroundListener: ForegroundListener? = null
+    private val sessionHolder = sessionHolderFactory.create(context, foregroundListener)
+    private val widgetComponent = widgetComponentFactory.create(context)
+    private val systemReceiver = systemReceiverFactory.create(context)
 
-    private lateinit var sessionHolder: MediaSessionHolder
+    val token: MediaSessionCompat.Token get() = sessionHolder.token
-    private lateinit var systemReceiver: SystemPlaybackReceiver
 
     // --- MEDIASESSION CALLBACKS ---
 
-    @SuppressLint("WrongConstant")
+    init {
-    fun attach(listener: ForegroundListener): MediaSessionCompat.Token {
-        foregroundListener = listener
         playbackManager.addListener(this)
-        exoHolder.attach()
-        sessionHolder = sessionHolderFactory.create(context, listener)
-        systemReceiver = SystemPlaybackReceiver(playbackManager, playbackSettings, widgetComponent)
-        ContextCompat.registerReceiver(
-            context, systemReceiver, systemReceiver.intentFilter, ContextCompat.RECEIVER_EXPORTED)
-        widgetComponent.attach()
-        return sessionHolder.token
     }
 
     fun handleTaskRemoved() {
@@ -101,10 +103,9 @@ constructor(
         sessionHolder.release()
         exoHolder.release()
         playbackManager.removeListener(this)
-        foregroundListener = null
     }
 
     override fun onSessionEnded() {
-        foregroundListener?.updateForeground(ForegroundListener.Change.MEDIA_SESSION)
+        foregroundListener.updateForeground(ForegroundListener.Change.MEDIA_SESSION)
     }
 }

app/src/main/java/org/oxycblt/auxio/playback/service/SystemPlaybackReceiver.kt

@@ -23,33 +23,35 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.media.AudioManager
+import androidx.core.content.ContextCompat
 import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.widgets.WidgetComponent
 import org.oxycblt.auxio.widgets.WidgetProvider
+import javax.inject.Inject
 
 /**
  * A [BroadcastReceiver] for receiving playback-specific [Intent]s from the system that require an
  * active [IntentFilter] to be registered.
  */
-class SystemPlaybackReceiver(
+class SystemPlaybackReceiver private constructor(
     private val playbackManager: PlaybackStateManager,
     private val playbackSettings: PlaybackSettings,
     private val widgetComponent: WidgetComponent
 ) : BroadcastReceiver() {
     private var initialHeadsetPlugEventHandled = false
 
-    val intentFilter =
+    class Factory @Inject constructor(
-        IntentFilter().apply {
+        private val playbackManager: PlaybackStateManager,
-            addAction(AudioManager.ACTION_AUDIO_BECOMING_NOISY)
+        private val playbackSettings: PlaybackSettings,
-            addAction(AudioManager.ACTION_HEADSET_PLUG)
+        private val widgetComponent: WidgetComponent
-            addAction(PlaybackActions.ACTION_INC_REPEAT_MODE)
+    ) {
-            addAction(PlaybackActions.ACTION_INVERT_SHUFFLE)
+        fun create(context: Context): SystemPlaybackReceiver {
-            addAction(PlaybackActions.ACTION_SKIP_PREV)
+            val receiver = SystemPlaybackReceiver(playbackManager, playbackSettings, widgetComponent)
-            addAction(PlaybackActions.ACTION_PLAY_PAUSE)
+            ContextCompat.registerReceiver(context, receiver, INTENT_FILTER, ContextCompat.RECEIVER_EXPORTED)
-            addAction(PlaybackActions.ACTION_SKIP_NEXT)
+            return receiver
-            addAction(WidgetProvider.ACTION_WIDGET_UPDATE)
+        }
     }
 
     override fun onReceive(context: Context, intent: Intent) {
@@ -127,4 +129,18 @@ class SystemPlaybackReceiver(
             playbackManager.playing(false)
         }
     }
+
+    private companion object {
+    val INTENT_FILTER =
+        IntentFilter().apply {
+            addAction(AudioManager.ACTION_AUDIO_BECOMING_NOISY)
+            addAction(AudioManager.ACTION_HEADSET_PLUG)
+            addAction(PlaybackActions.ACTION_INC_REPEAT_MODE)
+            addAction(PlaybackActions.ACTION_INVERT_SHUFFLE)
+            addAction(PlaybackActions.ACTION_SKIP_PREV)
+            addAction(PlaybackActions.ACTION_PLAY_PAUSE)
+            addAction(PlaybackActions.ACTION_SKIP_NEXT)
+            addAction(WidgetProvider.ACTION_WIDGET_UPDATE)
+        }
+    }
 }

app/src/main/java/org/oxycblt/auxio/widgets/WidgetComponent.kt

@@ -46,18 +46,25 @@ import org.oxycblt.auxio.util.logD
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class WidgetComponent
+class WidgetComponent private constructor(
-@Inject
+    private val context: Context,
-constructor(
-    @ApplicationContext private val context: Context,
     private val imageSettings: ImageSettings,
     private val bitmapProvider: BitmapProvider,
     private val playbackManager: PlaybackStateManager,
     private val uiSettings: UISettings
 ) : PlaybackStateManager.Listener, UISettings.Listener, ImageSettings.Listener {
+    class Factory @Inject constructor(
+        private val imageSettings: ImageSettings,
+        private val bitmapProvider: BitmapProvider,
+        private val playbackManager: PlaybackStateManager,
+        private val uiSettings: UISettings
+    ) {
+        fun create(context: Context) = WidgetComponent(context, imageSettings, bitmapProvider, playbackManager, uiSettings)
+    }
+
     private val widgetProvider = WidgetProvider()
 
-    fun attach() {
+    init {
         playbackManager.addListener(this)
         uiSettings.registerListener(this)
         imageSettings.registerListener(this)