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class MyMediaSessionCallback: MediaSessionCompat.Callback {
    override fun onPause() { ... }
    override fun onPlay() { ... }
    override fun onStop() { ... }
    override fun onSeekTo(position: Long) { ... }
    override fun onSkipToNext() { ... }
    override fun onSkipToPrevious() { ... }}

mediaSession.setCallback(myMediaSessionCallback)

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val program = WatchNextProgram.Builder()

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         .setWatchNextType(
             WatchNextPrograms.WATCH_NEXT_TYPE_CONTINUE)
         .setContentId(myProgramId)
         .setType(PreviewPrograms.TYPE_MOVIE)
         .setTitle("Program Title")
         .setDescription("Program Description")
         .setPosterArtUri(
             Uri.parse("http://example.com/poster_art.png"))
         .setLastEngagementTimeUtcMillis(System.currentTimeMillis())
Then you build

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PreviewChannelHelper(context).publishWatchNextProgram(program)

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val previewChannel = PreviewChannel.Builder()
        .setDisplayName(name)
        .setDescription(description)
        .setAppLinkIntentUri(Uri.parse(deeplinkUri))
        .setInternalProviderId(getPlaylistId())

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        .setLogo(bitmap)

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        .build()

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val helper = PreviewChannelHelper(context)

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val channelId = helper.publishChannel(previewChannel)

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val program = PreviewProgram.Builder()
        .setChannelId(channelId)
        // Matches the intent filter in the manifest for VIEW action
        .setIntentUri(Uri.parse("https://.../program/$id"))
        .build()
helper.publishPreviewProgram(program)