最小化/阻止后保留 App Android 运行 phone

Question

我创建了一个简单的应用程序（在 link How to Play Sound On Button Click in Android Studio Java 2021 之后），一切正常，但是，我需要这个应用程序在最小化或阻止 phone（是一款帮助我宝贝女儿入睡的白噪音应用程序，我需要它整夜播放）。

有什么方法或设置可以让应用程序最小化或阻塞后声音不停止吗？

感谢所有能帮助我和我宝宝的人:)

Answer 1

如果您在后台为您的应用程序添加运行功能，它将解决您的问题。您可以查看的资源：

https://developer.android.com/guide/components/services https://developer.android.com/guide/background/threading

基本示例：

AndroidManifest.xml :

    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<application
*
*
*
*
        <service android:name=".ui.main.AudioPlayerService"/>

 </application>

音频播放器服务：

    private const val PLAYBACK_CHANNEL_ID = "blabla"
        private const val PLAYBACK_NOTIFICATION_ID = 1
        
        class AudioPlayerService : Service() {
        
            private var player: SimpleExoPlayer? = null
            private var playerNotificationManager: PlayerNotificationManager? = null
            private val mediaItem: MediaItem = MediaItem.fromUri(ApiInterface.Channel24LiveURL)
        
            /** Classes to be connected to the service with the 
             service
             *reference providing the link between
             */
            private val mBinder = AudioServiceBinder()
        
            /**
* Data that the service will share to other classes.             */
            inner class AudioServiceBinder : Binder() {
                val service
                    get() = this@AudioPlayerService
        
                val player
                    get() = this@AudioPlayerService.player
            }
        
            override fun onBind(intent: Intent?): IBinder? {
                return mBinder
            }
        
            /**
             * Service start part
             */
            override fun onCreate() {
                super.onCreate()
        
                // init player
                player = SimpleExoPlayer.Builder(this)
                        .build().apply {
                            setMediaItem(mediaItem)
                            playWhenReady = true
                            prepare()
                        }
        
                playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(
                        applicationContext,
                        PLAYBACK_CHANNEL_ID,
                        R.string.playback_channel_name,
                        R.string.playback_channel_desc,
                        PLAYBACK_NOTIFICATION_ID,
                        object : PlayerNotificationManager.MediaDescriptionAdapter {
                            override fun getCurrentContentTitle(player: Player): CharSequence {
                                return getString(R.string.def_playback_title)
                            }
        
                            override fun createCurrentContentIntent(player: Player): PendingIntent? {
                                return PendingIntent.getActivity(
                                        applicationContext,
                                        0,
                                        Intent(applicationContext, MainActivity::class.java),
                                        PendingIntent.FLAG_CANCEL_CURRENT
                                )
                            }
        
                            override fun getCurrentContentText(player: Player): CharSequence? {
                                return null
                            }
        
                            override fun getCurrentLargeIcon(
                                    player: Player,
                                    callback: PlayerNotificationManager.BitmapCallback
                            ): Bitmap? {
                                return getBitmapFromVectorDrawable(applicationContext, R.mipmap.ic_launcher)
                            }
                        }, object : PlayerNotificationManager.NotificationListener {
                    override fun onNotificationCancelled(notificationId: Int, dismissedByUser: Boolean) {
                        stopSelf()
                    }
        
                    override fun onNotificationPosted(notificationId: Int, notification: Notification, ongoing: Boolean) {
                        if (ongoing) {
                            // Make sure the service will not get destroyed while playing media.
                            startForeground(notificationId, notification)
                        } else {
                            // Make notification cancellable.
                            stopForeground(false)
                        }
                    }
                }
                ).apply {
                    //   previous and next actions.
                    setUseNavigationActions(true)
                    setPlayer(player)
                }
            }
        
            @MainThread
            private fun getBitmapFromVectorDrawable(
                    context: Context,
                    @Suppress("SameParameterValue") @DrawableRes drawableId: Int
            ): Bitmap? {
                return ContextCompat.getDrawable(context, drawableId)?.let {
                    val drawable = DrawableCompat.wrap(it).mutate()
        
                    val bitmap = Bitmap.createBitmap(
                            drawable.intrinsicWidth,
                            drawable.intrinsicHeight,
                            Bitmap.Config.ARGB_8888
                    )
                    val canvas = Canvas(bitmap)
                    drawable.setBounds(0, 0, canvas.width, canvas.height)
                    drawable.draw(canvas)
        
                    bitmap
                }
            }
        
            @MainThread
            fun changePlayerVolume(view: ImageView) {
                player?.let {
                    if (it.volume == 1.0f) {
                        it.volume = 0.0f
                        view.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_volume_off))
                    } else {
                        it.volume = 1.0f
                        view.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_volume_up))
                    }
                }
            }
        
            @MainThread
            fun jumpLiveStream() {
                player?.let {
                    it.setMediaItem(mediaItem)
                    it.playWhenReady = true
                }
            }
        
            /**
* Triggered when the app is closed.             */
            override fun onTaskRemoved(rootIntent: Intent?) {// Stop the service when the user closes the application.l
                releasePlayer()
                stopSelf()
                super.onTaskRemoved(rootIntent)
            }
        
            override fun onDestroy() {
                releasePlayer()
                stopSelf()
                super.onDestroy()
            }
        
            /**
* delete player and playerNotificationManager             */
            private fun releasePlayer() {
                player?.let {
                    it.release()
                    player = null
                }
                playerNotificationManager?.let {
                    it.setPlayer(null)
                    playerNotificationManager = null
                }
            }
        }

祝你好运！

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