add audio foreground service for ExoPlayer

app/src/main/AndroidManifest.xml

@@ -2,21 +2,24 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.mikkipastel.exoplayer18">
 
-    <uses-permission android:name="android.permission.INTERNET "/>
+    <uses-permission android:name="android.permission.INTERNET"/>
 
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:theme="@style/PlayerTheme">
+
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <service android:name=".AudioPlayerService"/>
     </application>
 
 </manifest>

app/src/main/java/com/mikkipastel/exoplayer18/AudioPlayerService.kt

@@ -0,0 +1,108 @@
+package com.mikkipastel.exoplayer18
+
+import android.app.Notification
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Intent
+import android.graphics.Bitmap
+import android.os.IBinder
+import com.google.android.exoplayer2.ExoPlayerFactory
+import com.google.android.exoplayer2.Player
+import com.google.android.exoplayer2.SimpleExoPlayer
+import com.google.android.exoplayer2.source.ConcatenatingMediaSource
+import com.google.android.exoplayer2.source.ExtractorMediaSource
+import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
+import com.google.android.exoplayer2.ui.PlayerNotificationManager
+import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
+import com.google.android.exoplayer2.util.Util
+import com.mikkipastel.exoplayer18.C.PLAYBACK_CHANNEL_ID
+import com.mikkipastel.exoplayer18.C.PLAYBACK_NOTIFICATION_ID
+import com.mikkipastel.exoplayer18.Samples.SAMPLES
+
+class AudioPlayerService: Service() {
+
+    lateinit var player: SimpleExoPlayer
+
+    lateinit var playerNotificationManager: PlayerNotificationManager
+
+    override fun onCreate() {
+        super.onCreate()
+        val context = this
+
+        player = ExoPlayerFactory.newSimpleInstance(context, DefaultTrackSelector())
+
+        val dataSourceFactory = DefaultDataSourceFactory(
+                context,
+                Util.getUserAgent(context, "AudioDemo")
+        )
+
+        val concatenatingMediaSource = ConcatenatingMediaSource()
+        for (sample in SAMPLES) {
+            val mediaSource = ExtractorMediaSource.Factory(dataSourceFactory)
+                    .createMediaSource(sample.uri)
+            concatenatingMediaSource.addMediaSource(mediaSource)
+        }
+
+        player.prepare(concatenatingMediaSource)
+        player.playWhenReady = true
+
+        playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(
+                context,
+                PLAYBACK_CHANNEL_ID,
+                R.string.playback_channel_name,
+                PLAYBACK_NOTIFICATION_ID,
+                object: PlayerNotificationManager.MediaDescriptionAdapter {
+                    override fun getCurrentContentTitle(player: Player?): String {
+                        return SAMPLES[player!!.currentWindowIndex].title
+                    }
+
+                    override fun createCurrentContentIntent(player: Player?): PendingIntent? {
+                        return PendingIntent.getActivity(
+                                context,
+                                0,
+                                Intent(context, MainActivity::class.java),
+                                PendingIntent.FLAG_UPDATE_CURRENT
+                        )
+                    }
+
+                    override fun getCurrentContentText(player: Player?): String? {
+                        return SAMPLES[player!!.currentWindowIndex].description
+                    }
+
+                    override fun getCurrentLargeIcon(player: Player?, callback: PlayerNotificationManager.BitmapCallback?): Bitmap? {
+                        return Samples.getBitmap(
+                                context, SAMPLES[player!!.currentWindowIndex].bitmapResource)
+                    }
+
+                })
+
+        playerNotificationManager.apply {
+            setNotificationListener(object: PlayerNotificationManager.NotificationListener {
+                override fun onNotificationStarted(notificationId: Int, notification: Notification?) {
+                    startForeground(notificationId, notification)
+                }
+
+                override fun onNotificationCancelled(notificationId: Int) {
+                    stopSelf()
+                }
+
+            })
+            setPlayer(player)
+        }
+    }
+
+    override fun onDestroy() {
+        playerNotificationManager.setPlayer(null)
+        player.release()
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent?): IBinder? {
+        return null
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        return START_STICKY
+    }
+
+}

app/src/main/java/com/mikkipastel/exoplayer18/C.kt

@@ -0,0 +1,11 @@
+package com.mikkipastel.exoplayer18
+
+object C {
+
+    val PLAYBACK_CHANNEL_ID = "playback_channel"
+    val PLAYBACK_NOTIFICATION_ID = 1
+    val MEDIA_SESSION_TAG = "audio_demo"
+    val DOWNLOAD_CHANNEL_ID = "download_channel"
+    val DOWNLOAD_NOTIFICATION_ID = 2
+
+}

app/src/main/java/com/mikkipastel/exoplayer18/MainActivity.kt

@@ -1,46 +1,28 @@
 package com.mikkipastel.exoplayer18
 
 import android.app.Activity
+import android.content.Intent
 import android.os.Bundle
-import com.google.android.exoplayer2.ExoPlayerFactory
-import com.google.android.exoplayer2.SimpleExoPlayer
-import com.google.android.exoplayer2.source.ExtractorMediaSource
-import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
-import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
+import android.widget.ArrayAdapter
 import com.google.android.exoplayer2.util.Util
+import com.mikkipastel.exoplayer18.Samples.SAMPLES
 import kotlinx.android.synthetic.main.activity_main.*
 
 class MainActivity : Activity() {
 
-    private var player: SimpleExoPlayer? = null
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
-    }
-
-    override fun onStart() {
-        super.onStart()
-
-        player = ExoPlayerFactory.newSimpleInstance(this, DefaultTrackSelector())
 
-        playerView.player = player
+        val intent = Intent(this, AudioPlayerService::class.java)
+        Util.startForegroundService(this, intent)
 
-        val dataSourceFactory = DefaultDataSourceFactory(this,
-                Util.getUserAgent(this, getString(R.string.app_name)))
-        val mediaSource = ExtractorMediaSource.Factory(dataSourceFactory)
-                .createMediaSource(Samples.MP4_URI)
-
-        player?.prepare(mediaSource)
-        player?.playWhenReady = true
+        listview.adapter = ArrayAdapter(
+                this,
+                android.R.layout.simple_list_item_1,
+                emptyArray<Samples>()
+        )
 
     }
 
-    override fun onStop() {
-        super.onStop()
-
-        playerView.player = null
-        player?.release()
-        player = null
-    }
 }

app/src/main/java/com/mikkipastel/exoplayer18/Samples.kt

@@ -1,11 +1,63 @@
 package com.mikkipastel.exoplayer18
 
+import android.content.Context
 import android.net.Uri
+import android.graphics.drawable.BitmapDrawable
+import android.support.annotation.DrawableRes
+import android.graphics.Bitmap
+import android.support.v4.media.MediaDescriptionCompat
+import android.support.v4.media.MediaMetadataCompat
+import android.os.Bundle
 
-class Samples {
+object Samples {
 
-    companion object {
-        val MP4_URI = Uri.parse("https://storage.googleapis.com/exoplayer-test-media-0/firebase-animation.mp4")
-        val AD_TAG_URI = Uri.parse("https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/ad_rule_samples&ciu_szs=300x250&ad_rule=1&impl=s&gdfp_req=1&env=vp&output=vmap&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ar%3Dpremidpostlongpod&cmsid=496&vid=short_tencue&correlator=")
+    class Sample(
+            url: String,
+            val mediaId: String,
+            val title: String,
+            val description: String,
+            val bitmapResource: Int) {
+
+        val uri: Uri = Uri.parse(url)
+
+        override fun toString(): String {
+            return title
+        }
+    }
+
+    val SAMPLES = arrayOf(Sample(
+            "http://storage.googleapis.com/automotive-media/Jazz_In_Paris.mp3",
+            "audio_1",
+            "Jazz in Paris",
+            "Jazz for the masses",
+            R.drawable.album_art_1), Sample(
+            "http://storage.googleapis.com/automotive-media/The_Messenger.mp3",
+            "audio_2",
+            "The messenger",
+            "Hipster guide to London",
+            R.drawable.album_art_2), Sample(
+            "http://storage.googleapis.com/automotive-media/Talkies.mp3",
+            "audio_3",
+            "Talkies",
+            "If it talks like a duck and walks like a duck.",
+            R.drawable.album_art_3))
+
+    fun getMediaDescription(context: Context, sample: Sample): MediaDescriptionCompat {
+        val extras = Bundle()
+        val bitmap = getBitmap(context, sample.bitmapResource)
+        extras.putParcelable(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, bitmap)
+        extras.putParcelable(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON, bitmap)
+        return MediaDescriptionCompat.Builder()
+                .setMediaId(sample.mediaId)
+                .setIconBitmap(bitmap)
+                .setTitle(sample.title)
+                .setDescription(sample.description)
+                .setExtras(extras)
+                .build()
+    }
+
+    fun getBitmap(context: Context, @DrawableRes bitmapResource: Int): Bitmap {
+        return (context.resources.getDrawable(bitmapResource, context.theme) as BitmapDrawable).bitmap
     }
+
 }

app/src/main/res/drawable/ic_queue_music_24dp.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFCCCCCC"
+        android:pathData="M15,6L3,6v2h12L15,6zM15,10L3,10v2h12v-2zM3,16h8v-2L3,14v2zM17,6v8.18c-0.31,-0.11 -0.65,-0.18 -1,-0.18 -1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3L19,8h3L22,6h-5z"/>
+</vector>

app/src/main/res/layout/activity_main.xml

@@ -3,9 +3,14 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <com.google.android.exoplayer2.ui.PlayerView
-        android:id="@+id/playerView"
+    <ImageView
         android:layout_width="match_parent"
-        android:layout_height="match_parent"/>
+        android:layout_height="match_parent"
+        android:src="@drawable/ic_queue_music_24dp"
+        android:scaleType="fitCenter" />
 
+    <ListView
+        android:id="@+id/listview"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
 </FrameLayout>

app/src/main/res/values/strings.xml

@@ -1,3 +1,5 @@
 <resources>
     <string name="app_name">exoplayer18</string>
+    <string name="playback_channel_name">Playback</string>
+    <string name="download_channel_name">Download</string>
 </resources>