LibreTube/app/src/main/java/com/github/libretube/BackgroundMode.kt

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Kotlin
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package com.github.libretube
import android.content.Context
import android.support.v4.media.session.MediaSessionCompat
import com.github.libretube.obj.Streams
import com.github.libretube.util.DescriptionAdapter
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import com.github.libretube.util.RetrofitInstance
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import com.google.android.exoplayer2.C
import com.google.android.exoplayer2.ExoPlayer
import com.google.android.exoplayer2.MediaItem
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import com.google.android.exoplayer2.audio.AudioAttributes
import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector
import com.google.android.exoplayer2.ui.PlayerNotificationManager
import gen._base._base_java__rjava_resources.srcjar.R.id.title
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking
/**
* Loads the selected video audio in background mode with a notification area.
*/
class BackgroundMode {
/**
* The response that gets when called the Api.
*/
private var response: Streams? = null
/**
* The [ExoPlayer] player. Followed tutorial [here](https://developer.android.com/codelabs/exoplayer-intro)
*/
private var player: ExoPlayer? = null
private var playWhenReadyPlayer = true
/**
* The [MediaSessionCompat] for the [response].
*/
private lateinit var mediaSession: MediaSessionCompat
/**
* The [MediaSessionConnector] to connect with the [mediaSession] and implement it with the [player].
*/
private lateinit var mediaSessionConnector: MediaSessionConnector
/**
* The [PlayerNotificationManager] to load the [mediaSession] content on it.
*/
private lateinit var playerNotification: PlayerNotificationManager
/**
* Initializes the [player] with the [MediaItem].
*/
private fun initializePlayer(c: Context) {
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/**
* The [audioAttributes] handle the audio focus of the [player]
*/
val audioAttributes = AudioAttributes.Builder()
.setUsage(C.USAGE_MEDIA)
.setContentType(C.CONTENT_TYPE_MUSIC)
.build()
if (player == null) {
player = ExoPlayer.Builder(c)
.setAudioAttributes(audioAttributes, true)
.build()
}
setMediaItem(c)
}
/**
* Initializes the [playerNotification] attached to the [player] and shows it.
*/
private fun initializePlayerNotification(c: Context, streams: Streams) {
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playerNotification = PlayerNotificationManager
.Builder(c, 1, "background_mode")
// set the description of the notification
.setMediaDescriptionAdapter(
DescriptionAdapter(streams.title!!, streams.uploader!!, streams.thumbnailUrl!!)
)
.build()
playerNotification.apply {
setPlayer(player)
setUsePreviousAction(false)
setUseNextAction(false)
setMediaSessionToken(mediaSession.sessionToken)
}
}
/**
* Sets the [MediaItem] with the [response] into the [player]. Also creates a [MediaSessionConnector]
* with the [mediaSession] and attach it to the [player].
*/
private fun setMediaItem(c: Context) {
response?.let {
val mediaItem = MediaItem.Builder().setUri(it.hls!!).build()
player?.setMediaItem(mediaItem)
}
mediaSession = MediaSessionCompat(c, this.javaClass.name)
mediaSession.isActive = true
mediaSessionConnector = MediaSessionConnector(mediaSession)
mediaSessionConnector.setPlayer(player)
}
/**
* Gets the video data and prepares the [player].
*/
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fun playOnBackgroundMode(c: Context, videoId: String, seekToPosition: Long) {
runBlocking {
val job = launch {
response = RetrofitInstance.api.getStreams(videoId)
}
// Wait until the job is done, to load correctly later in the player
job.join()
initializePlayer(c)
initializePlayerNotification(c, response!!)
player?.apply {
playWhenReady = playWhenReadyPlayer
prepare()
}
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if (!seekToPosition.equals(0)) player?.seekTo(seekToPosition)
}
}
/**
* Creates a singleton of this class, to not create a new [player] every time.
*/
companion object {
private var INSTANCE: BackgroundMode? = null
fun getInstance(): BackgroundMode {
if (INSTANCE == null) INSTANCE = BackgroundMode()
return INSTANCE!!
}
}
}