Google 助理上的媒体播放命令无法启动我的应用

问题描述

我在让 Google 助理为我的媒体应用播放媒体时遇到了一些问题。

我已经使用 Media Controller Tester 应用验证了播放操作正在运行。我可以通过 Google 助理使用 Open Feature Actions。

但每次我尝试使用 Play AppName 或 Play Station on AppName 之类的短语时，Google 助理都会尝试启动 TuneIn。 如果我尝试 Play music on AppName 助理启动 YouTube 音乐。

我已经尝试了文档 here 中的所有内容，并使用 UAMP 作为基础（我也看到了类似的行为）

这是我的音频服务的精简版：

class AudioService : MediabrowserServiceCompat() {

    @Inject
    lateinit var audioServicebrowserManager: AudioServicebrowserManager

    @Inject
    lateinit var schedulerProvider: RxSchedulerProvider

    @Inject
    lateinit var playbackPreparer: AppPlaybackPreparer

    @Inject
    lateinit var playbackControldispatcher: AppControldispatcher

    @Inject
    lateinit var audioProvider: AudioProvider

    @Inject
    lateinit var playbackManager: PlaybackManager

    @Inject
    lateinit var mediaSessionChangedCallback: MediaSessionChangedCallback

    private lateinit var mediaSession: MediaSessionCompat
    private lateinit var mediaSessionConnector: MediaSessionConnector
    private lateinit var mediaController: MediaControllerCompat
    private lateinit var audionotificationmanager: Audionotificationmanager

    private lateinit var packageValidator: PackageValidator

    private val disposables = Compositedisposable()

    companion object {
        private const val SEEK_BACKWARD_INCREMENT = 15000
        private const val SEEK_FORWARD_INCREMENT = 30000

        private const val MEDIA_SESSION_TAG: String = "AudioService"

        internal const val MetaDATA_MEDIA_TYPE = "au.net.app.player.service.Metadata.mediaType"
        internal const val MetaDATA_MEDIA_TYPE_ondemand_VIDEO = 0L
        internal const val MetaDATA_MEDIA_TYPE_ondemand_AUdio = 2L
        internal const val MetaDATA_MEDIA_TYPE_LIVE = 1L

        val DEFAULT_PLAYBACK_STATE: PlaybackStateCompat = PlaybackStateCompat.Builder()
                .setState(PlaybackStateCompat.STATE_NONE,PlaybackStateCompat.PLAYBACK_POSITION_UNKNowN,1.0f)
                .build()
    }

    override fun onCreate() {
        AndroidInjection.inject(this)
        super.onCreate()

        mediaSession = MediaSessionCompat(this,MEDIA_SESSION_TAG).apply {
            setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS or MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS)
            isActive = true
        }

        sessionToken = mediaSession.sessionToken

        mediaSessionConnector = MediaSessionConnector(mediaSession).apply {
            setRewindIncrementMs(SEEK_BACKWARD_INCREMENT)
            setFastForwardIncrementMs(SEEK_FORWARD_INCREMENT)
            setPlaybackPreparer(playbackPreparer)
            setQueueNavigator(AppQueueNavigator(mediaSession,audioProvider,this@AudioService,this))
            setControldispatcher(playbackControldispatcher)
            setPlayer(playbackManager.currentPlayback.playerImpl)
            registerCustomCommandReceiver(playbackManager.mediaSessionCommandReceiver)
        }

        disposables.add(
                playbackManager.currentPlaybackObservable.subscribe { currentPlayback ->
                    mediaSessionConnector.setPlayer(currentPlayback.playerImpl)
                }
        )

        mediaController = MediaControllerCompat(this,mediaSession)
        mediaController.registerCallback(mediaSessionChangedCallback)

        try {
            audionotificationmanager = Audionotificationmanager(this,mediaController)
        } catch (e: remoteexception) {
            throw IllegalStateException("Could not create a Medianotificationmanager",e)
        }

        packageValidator = PackageValidator(this,R.xml.allowed_media_browser_callers)
    }

    private var currentLoadChildrendisposable: disposable? = null
    override fun onLoadChildren(parentId: String,result: Result<MutableList<MediabrowserCompat.MediaItem>>) {
        Timber.d("""
            onLoadChildren(
                parentId = $parentId,result = $result
            )
        """.trimIndent())
    }

    override fun onGetRoot(clientPackageName: String,clientUid: Int,rootHints: Bundle?): browserRoot? {
        Timber.d("""
            onGetRoot(
                clientPackageName = $clientPackageName,clientUid = $clientUid,rootHints = $rootHints
            )
        """.trimIndent())
    }

    override fun onStartCommand(intent: Intent?,flags: Int,startId: Int): Int {
        super.onStartCommand(intent,flags,startId)

        return START_STICKY
    }

    override fun onTaskRemoved(rootIntent: Intent?) {
        super.onTaskRemoved(rootIntent)

        playbackManager.handleStop()
        stopSelf()
    }

    override fun onDestroy() {
        super.onDestroy()

        playbackManager.handleStop()

        disposables.dispose()

        mediaSession.isActive = false
        mediaSession.release()
    }
}

模块清单（注意 - 该服务不在我的主应用模块中）

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="au.net.app.player.service">

    <uses-permission android:name="android.permission.INTERNET" />

    <application>

        <service
            android:name="au.net.app.player.service.AudioService"
            android:exported="true">
            <intent-filter>
                <action android:name="android.media.browse.MediabrowserService" />
            </intent-filter>
        </service>

        <receiver android:name="androidx.media.session.MediaButtonReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
        </receiver>

        <Meta-data
            android:name="com.google.android.gms.car.application"
            android:resource="@xml/automotive_app_desc" />

    </application>

</manifest>

在主应用清单中：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="au.net.app"
    android:installLocation="auto">

    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:name=".AppApplication"
        android:allowBackup="true"
        android:label="@string/app_name"
        android:icon="@mipmap/ic_launcher"
        android:networkSecurityConfig="@xml/network_security_config"
        android:supportsRtl="true"
        android:hardwareAccelerated="true"
        android:theme="@style/AppTheme">

        <activity
            android:name=".mainscreen.MainActivity"
            android:launchMode="singleTask"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar"
            android:resizeableActivity="true"
            android:supportsPictureInPicture="true"
            android:windowSoftInputMode="adjustResize">

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <!-- Intent filters to open Feature screens -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.broWSABLE" />
                <data
                    android:host="feature"
                    android:pathPattern="/.*"
                    android:scheme="${APP_SCHEME}" />
            </intent-filter>

            <!-- Declares that the app handles SEARCH intent for media playback -->
            <!-- This is mandatory for Android Auto support: -->
            <!-- https://stackoverflow.com/questions/31953155/android-auto-voice-cannot-perform-play-x-on-y/31976075#31976075 -->
            <intent-filter>
                <action android:name="android.media.action.MEDIA_PLAY_FROM_SEARCH" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>


        <!-- required for Google Assistant integration -->
        <Meta-data android:name="com.google.android.actions" android:resource="@xml/actions" />

    </application>

</manifest>

我还尝试使用以下方法设置我的播放状态：

        val DEFAULT_PLAYBACK_STATE: PlaybackStateCompat = PlaybackStateCompat.Builder()
                .setActions(getSupportedActions())
                .setState(PlaybackStateCompat.STATE_NONE,1.0f)
                .build()

        private fun getSupportedActions(): Long {
            return PlaybackStateCompat.ACTION_PLAY or
                    PlaybackStateCompat.ACTION_PLAY_FROM_SEARCH or
                    PlaybackStateCompat.ACTION_SKIP_TO_NEXT or
                    PlaybackStateCompat.ACTION_SKIP_TO_PREVIoUS or
                    PlaybackStateCompat.ACTION_PLAY_PAUSE
        }

但我的理解是我不需要，因为 MediaSessionConnector 应该负责（因为我使用的是 ExoPlayer）。添加这个没有帮助。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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