Enable android auto support

Meet min requirements for Android Auto to connect to our mediasession

Still to go:
1. File browsing
2. Additional playback controls

app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="com.github.apognu.otter">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.github.apognu.otter">
 
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
@@ -16,6 +17,13 @@
     android:supportsRtl="true"
     android:theme="@style/AppTheme">
 
+    <meta-data
+        android:name="com.google.android.gms.car.notification.SmallIcon"
+        android:resource="@drawable/ottershape" />
+    <meta-data android:name="com.google.android.gms.car.application"
+        android:resource="@xml/automotive_app_desc"/>
+
+
     <!-- <meta-data
       android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
       android:value="com.google.android.exoplayer2.ext.cast.DefaultCastOptionsProvider"/> -->
@@ -44,7 +52,14 @@
     <activity android:name="com.github.apognu.otter.activities.SettingsActivity" />
     <activity android:name="com.github.apognu.otter.activities.LicencesActivity" />
 
-    <service android:name="com.github.apognu.otter.playback.PlayerService" />
+    <service
+        android:name="com.github.apognu.otter.playback.PlayerService"
+        android:exported="true"
+        tools:ignore="ExportedService">
+      <intent-filter>
+        <action android:name="android.media.browse.MediaBrowserService"/>
+      </intent-filter>
+    </service>
 
     <service
       android:name=".playback.PinService"

app/src/main/java/com/github/apognu/otter/playback/PlayerService.kt

@@ -1,7 +1,6 @@
 package com.github.apognu.otter.playback
 
 import android.annotation.SuppressLint
-import android.app.Service
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
@@ -9,10 +8,13 @@ import android.media.AudioAttributes
 import android.media.AudioFocusRequest
 import android.media.AudioManager
 import android.os.Build
-import android.os.IBinder
+import android.os.Bundle
+import android.support.v4.media.MediaBrowserCompat
+import android.support.v4.media.MediaDescriptionCompat
 import android.support.v4.media.session.MediaSessionCompat
 import android.view.KeyEvent
 import com.github.apognu.otter.Otter
+import androidx.media.MediaBrowserServiceCompat
 import com.github.apognu.otter.R
 import com.github.apognu.otter.utils.*
 import com.google.android.exoplayer2.C
@@ -30,7 +32,7 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 
-class PlayerService : Service() {
+class PlayerService : MediaBrowserServiceCompat() {
   private lateinit var queue: QueueManager
   private val jobs = mutableListOf<Job>()
 
@@ -84,6 +86,8 @@ class PlayerService : Service() {
       isActive = true
     }
 
+    sessionToken = mediaSession.sessionToken
+
     mediaControlsManager = MediaControlsManager(this, mediaSession)
 
     player = SimpleExoPlayer.Builder(this).build().apply {
@@ -224,8 +228,6 @@ class PlayerService : Service() {
     })
   }
 
-  override fun onBind(intent: Intent?): IBinder? = null
-
   @SuppressLint("NewApi")
   override fun onDestroy() {
     jobs.forEach { it.cancel() }
@@ -437,4 +439,20 @@ class PlayerService : Service() {
       }
     }
   }
+
+  override fun onGetRoot(
+    clientPackageName: String,
+    clientUid: Int,
+    rootHints: Bundle?
+  ): BrowserRoot? {
+    return BrowserRoot("/", null)
+  }
+
+  override fun onLoadChildren(
+    parentId: String,
+    result: Result<List<MediaBrowserCompat.MediaItem>>
+  ) {
+    val list = mutableListOf<MediaBrowserCompat.MediaItem>()
+    result.sendResult(list)
+  }
 }

app/src/main/res/xml/automotive_app_desc.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<automotiveApp>
+    <uses name="media"/>
+</automotiveApp>