1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.android.music
17 
18 import android.app.PendingIntent
19 import android.content.Context
20 import android.content.Intent
21 import android.media.browse.MediaBrowser.MediaItem
22 import android.media.session.MediaSession
23 import android.media.session.PlaybackState
24 import android.os.Bundle
25 import android.service.media.MediaBrowserService
26 import android.util.Log
27 
28 /**
29  * Provides "background" audio playback capabilities, allowing the
30  * user to switch between activities without stopping playback.
31  */
32 class MediaPlaybackService : MediaBrowserService() {
33 
34     private lateinit var mSession: MediaSession
35 
36     override fun onCreate() {
37         super.onCreate()
38 
39         // Start a new MediaSession
40         mSession = MediaSession(this, "MediaPlaybackService")
41         // Enable callbacks from MediaButtons and TransportControls
42         mSession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS
43                 or MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS)
44         // Set an initial PlaybackState with ACTION_PLAY, so media buttons can start the player
45         val stateBuilder: PlaybackState.Builder = PlaybackState.Builder().setActions(
46                 PlaybackState.ACTION_PLAY or PlaybackState.ACTION_PLAY_PAUSE)
47         mSession.setPlaybackState(stateBuilder.build())
48         setSessionToken(mSession.getSessionToken())
49         val context: Context = getApplicationContext()
50         val intent = Intent(context, MusicBrowserActivity::class.java)
51         val pi: PendingIntent = PendingIntent.getActivity(
52                 context, 99 /*request code*/, intent, PendingIntent.FLAG_UPDATE_CURRENT)
53         mSession.setSessionActivity(pi)
54     }
55 
56     override fun onStartCommand(startIntent: Intent?, flags: Int, startId: Int): Int {
57         return START_STICKY
58     }
59 
60     override fun onDestroy() {}
61 
62     override fun onGetRoot(clientPackageName: String, clientUid: Int, rootHints: Bundle?): BrowserRoot? {
63         return null
64     }
65 
66     override fun onLoadChildren(parentMediaId: String, result: Result<List<MediaItem>>) {
67         result.sendResult(null)
68     }
69 
70     private inner class MediaSessionCallback : MediaSession.Callback() {
71         override fun onPlay() {}
72 
73         override fun onSkipToQueueItem(queueId: Long) {}
74 
75         override fun onSeekTo(position: Long) {}
76 
77         override fun onPlayFromMediaId(mediaId: String?, extras: Bundle?) {}
78 
79         override fun onPause() {}
80 
81         override fun onStop() {}
82 
83         override fun onSkipToNext() {}
84 
85         override fun onSkipToPrevious() {}
86 
87         override fun onPlayFromSearch(query: String?, extras: Bundle?) {}
88 
89         override fun onCustomAction(action: String, extras: Bundle?) {}
90     }
91 }