playback: fix media button intent handling

This actually broke in v3.6.0 or v3.5.0 I think, it just now appeared
in v4.0.0 for some reason.

This is a temporary fix, will rethink these intents later.

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

@@ -76,9 +76,8 @@ class AuxioService :
     }
 
     private fun onHandleForeground(intent: Intent?) {
-        val startId = intent?.getIntExtra(INTENT_KEY_START_ID, -1) ?: -1
         musicFragment.start()
-        playbackFragment.start(startId)
+        playbackFragment.start(intent)
     }
 
     override fun onTaskRemoved(rootIntent: Intent?) {

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

@@ -65,6 +65,8 @@ object IntegerTable {
     const val START_ID_ACTIVITY = 0xA050
     /** Tasker AuxioService Start ID */
     const val START_ID_TASKER = 0xA051
+    /** MediaButtonReceiver AuxioService Start ID */
+    const val START_ID_MEDIA_BUTTON = 0xA052
     /** RepeatMode.NONE */
     const val REPEAT_MODE_NONE = 0xA100
     /** RepeatMode.ALL */

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

@@ -26,6 +26,7 @@ import androidx.core.content.ContextCompat
 import dagger.hilt.android.AndroidEntryPoint
 import javax.inject.Inject
 import org.oxycblt.auxio.AuxioService
+import org.oxycblt.auxio.IntegerTable
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import timber.log.Timber as L
 
@@ -47,8 +48,11 @@ class MediaButtonReceiver : BroadcastReceiver() {
             // stupid this is with the state of foreground services on modern android. One
             // wrong action at the wrong time will result in the app crashing, and there is
             // nothing I can do about it.
+            // TODO: Think I finally have an alternative with the changes I made to accomodate
+            //  tasker
             L.d("Delivering media button intent $intent")
             intent.component = ComponentName(context, AuxioService::class.java)
+            intent.putExtra(AuxioService.INTENT_KEY_START_ID, IntegerTable.START_ID_MEDIA_BUTTON)
             ContextCompat.startForegroundService(context, intent)
         }
     }

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

@@ -20,6 +20,7 @@ package org.oxycblt.auxio.playback.service
 
 import android.annotation.SuppressLint
 import android.content.Context
+import android.content.Intent
 import android.graphics.Bitmap
 import android.support.v4.media.MediaMetadataCompat
 import android.support.v4.media.session.MediaSessionCompat
@@ -28,6 +29,7 @@ import androidx.annotation.DrawableRes
 import androidx.car.app.mediaextensions.MetadataExtras
 import androidx.core.app.NotificationCompat
 import androidx.media.app.NotificationCompat.MediaStyle
+import androidx.media.session.MediaButtonReceiver
 import javax.inject.Inject
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.ForegroundListener
@@ -108,6 +110,9 @@ private constructor(
         }
     }
 
+    fun tryMediaButtonIntent(intent: Intent): Boolean =
+        MediaButtonReceiver.handleIntent(mediaSession, intent) != null
+
     /**
      * Release this instance, closing the [MediaSessionCompat] and preventing any further updates to
      * the [PlaybackNotification].

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

@@ -19,9 +19,11 @@
 package org.oxycblt.auxio.playback.service
 
 import android.content.Context
+import android.content.Intent
 import android.support.v4.media.session.MediaSessionCompat
 import javax.inject.Inject
 import kotlinx.coroutines.Job
+import org.oxycblt.auxio.AuxioService.Companion.INTENT_KEY_START_ID
 import org.oxycblt.auxio.ForegroundListener
 import org.oxycblt.auxio.ForegroundServiceNotification
 import org.oxycblt.auxio.IntegerTable
@@ -83,18 +85,34 @@ private constructor(
         }
     }
 
-    fun start(startedBy: Int) {
+    fun start(intent: Intent?) {
         // At minimum we want to ensure an active playback state.
         // TODO: Possibly also force to go foreground?
-        L.d("Handling non-native start.")
+        val startId = intent?.getIntExtra(INTENT_KEY_START_ID, -1)
         val action =
-            when (startedBy) {
+            when (startId) {
                 IntegerTable.START_ID_ACTIVITY -> null
                 IntegerTable.START_ID_TASKER ->
                     DeferredPlayback.RestoreState(
                         play = true, fallback = DeferredPlayback.ShuffleAll)
+                IntegerTable.START_ID_MEDIA_BUTTON -> {
+                    if (!sessionHolder.tryMediaButtonIntent(intent)) {
+                        // Malformed intent, need to restore state immediately
+                        DeferredPlayback.RestoreState(
+                            play = true, fallback = DeferredPlayback.ShuffleAll)
+                    } else {
+                        null
+                    }
+                }
+                else -> {
+                    L.d("Handling non-native start.")
+                    if (intent != null && sessionHolder.tryMediaButtonIntent(intent)) {
+                        // Just a media button intent, move on.
+                        return
+                    }
                     // External services using Auxio better know what they are doing.
-                else -> DeferredPlayback.RestoreState(play = false)
+                    DeferredPlayback.RestoreState(play = false)
+                }
             }
         if (action != null) {
             L.d("Initing service fragment using action $action")