问存储在Firebase存储中的m3u8文件不会在网络播放器上播放

EN

"hosting": {
  "headers": [ {
    "source": "**/*.*",
    "headers": [ {
      "key": "Access-Control-Allow-Origin",
      "value": "*"
    } ]
  } ]
}

<com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="0sp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="20dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

 SimpleExoPlayer player;

//declare your PlayerView 

final PlayerView playerView = mview.findViewById(R.id.video_view);

//your database ref

        final StorageReference storageReference =
                FirebaseStorage.getInstance().getReference("/Post_Video/"+ video + ".mp4");


 player = ExoPlayerFactory.newSimpleInstance(MainActivity.this);
        playerView.setPlayer(player);

        playerView.setVisibility(View.VISIBLE);

        playerView.getLayoutParams().height=550;
        playerView.getLayoutParams().width=950;

        storageReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {


                BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter.Builder(MainActivity.this).build();
                TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
                ExoPlayer exoPlayer = (SimpleExoPlayer) ExoPlayerFactory.newSimpleInstance(MainActivity.this);
                Uri video = Uri.parse(uri.toString());
                DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("video");
                ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
                MediaSource mediaSource = new ExtractorMediaSource(video,dataSourceFactory,extractorsFactory,null,null);
                playerView.setPlayer(exoPlayer);
                exoPlayer.prepare(mediaSource);
                exoPlayer.setPlayWhenReady(false);

            }
        });