Exoplayer2 track switch MappedTrackInfo. GetTrackGroups (int) & # x27; On a null object reference-CodePudding

 
Private void initializePlayer () {
TrackSelector=new DefaultTrackSelector (); 
MappingTrackSelector. MappedTrackInfo trackInfo=trackSelector. GetCurrentMappedTrackInfo (); 
If (trackInfo==null) 
return; 

DefaultTrackSelector. The Parameters. The Parameters=trackSelector getParameters () buildUpon () 
SetSelectionOverride (1, trackInfo getTrackGroups (1), 
New DefaultTrackSelector. SelectionOverride (1, 1)) 
.build(); 
TrackSelector. SetParameters (parameters); 

Player=ExoPlayerFactory. NewSimpleInstance (this, trackSelector); 
PlayerView. SetPlayer (player); 
Player. SetPlayWhenReady (true); 
Player. SeekTo (currentWindow playbackPosition); 
The DataSource. Factory dataSourceFactory=new DefaultDataSourceFactory (this, 
Util. GetUserAgent (this, "ExoPlayer")); 
Uri Uri=Uri. Parse (Environment. External.getexternalstoragedirectory () + "/Movies/3 dall. Mp4"); 
MediaSource videoSource=new ExtractorMediaSource. Factory (dataSourceFactory) 
CreateMediaSource (uri); 
Player. Prepare (videoSource); 
}

For the first time to use ExoPlayer
Implementation of video language switch, trackInfo has always been a null
New DefaultTrackSelector. SelectionOverride (int groupIndex, int... The parameter hasn't been seen) figure out what
The first is the index of language? The second is what

CodePudding user response:

You don't need to set up here so much

 
TrackSelector=new DefaultTrackSelector (); 
Player=ExoPlayerFactory. NewSimpleInstance (this, trackSelector);

In this way