ExoPlayer:显示字幕

Question

我使用ExoPlayer来播放来自URL的音频。我有XML格式的字幕，如下所示：

    [
    {
        "id": 1,
        "startTime": "00:00:00",
        "endTime": "00:00:05",
        "textEn": "towns, in late 15th-century England.",
        "textRu": null
    },
    {
        "id": 2,
        "startTime": "00:00:05",
        "endTime": "00:00:10",
        "textEn": "the first thing to note is that in stark contrast to today, England was an overwhelmingly rural country.",
        "textRu": null
    }
]

我知道在使用ExoPlayer播放时有一种显示字幕的方法。但是，我扫描了开发人员指南中的所有内容：ExoPlayer开发人员指南，但没有找到如何做到这一点，因为文档非常糟糕。另外，是否XML格式的字幕适合于ExoPlayer，如果现在，我应该如何转换它们和格式。ExoPlayer忍者请帮我)

Answer 1

如果字幕XML来自HTTP：

Format subtitleFormat = Format.createTextSampleFormat(
                null, // An identifier for the track. May be null.
                MimeTypes.APPLICATION_SUBRIP, // The mime type. Must be set correctly.
                C.SELECTION_FLAG_DEFAULT, // Selection flags for the track.
                null); // The subtitle language. May be null.

MediaSource subtitleSource = new SingleSampleMediaSource.Factory(dataSourceFactory)
                        .createMediaSource(Uri.parse(subtitleUrl), subtitleFormat, C.TIME_UNSET);

        MergingMediaSource mergedSource =
                new MergingMediaSource(videoSource, subtitleSource);
player.prepare(mergedSource);

Answer 2

您可以将json格式转换为.str格式，并将其保存为文件。现在，ExoPlayer可以显示.str文件。下面是str格式的示例：

1
00:02:17,440 --> 00:02:20,375
Senator, we're making
our final approach into Coruscant.

2
00:02:20,476 --> 00:02:22,501
Very good, Lieutenant.