NullPointerException when setting mediaItem

[XilinJia]

NullPointerException when setting mediaItem

[MGaetan89]

I think that you forgot to set the media uri on your MediaItem, ie.:

val mediaItem = MediaItem.Builder()
    .setUri("https://my.media/".toUri())
    .setMediaMetadata(builder.build())
    .build()

[XilinJia]

I think that you forgot to set the media uri on your MediaItem, ie.:

val mediaItem = MediaItem.Builder()
    .setUri("https://my.media/".toUri())
    .setMediaMetadata(builder.build())
    .build()

Merci beaucoup @MGaetan89. That cut it.

Hope I somewhere in the doc state that setUri is necessary.

[tonihei]

Yes, you need a Uri to play the item with ExoPlayer.

I'm curious what you expected to happen without the Uri. Could you explain that in more detail? The documentation usually shows examples with Uri, but it doesn't point out that it is definitely needed assuming there is no way you can play this item without a Uri.

[XilinJia]

I migrated the project from exoplayer2 to media3. In the way, it's more convenient to do: exoPlayer?.setMediaSource(mediaSource!!, false) and then play the media. That works without setting mediaItem. But it appears (?) that I need to set the mediaItem in order to show the media info on the notification widget, so I started doing the above and got the exception.

So now since exoplayer requires setting of the uri, the separate setting of media source is redundant, or even overridden? What's the best approach?

[tonihei]

You just have to use one of them. Please see https://developer.android.com/media/media3/exoplayer/media-items and https://developer.android.com/media/media3/exoplayer/media-sources for more details