直播原始碼APP，基於google ExoPlayer 簡單自定義播放介面實現的相關程式碼
1.直播原始碼AP基於google ExoPlayer播放m3u8，mp4等檔案

簡單自定義播放介面，新建一個Layout
 
佈局檔案命名為exo_playback_control_view，控制元件的id不能隨便起，
 
要與exoPlayer原來PlaybackControlView的佈局控制元件id，名稱一致，
 
佈局名稱不一定是exo_playback_control_view，不過需要在SimpleExoPlayerView控制元件中新增一個：
 
app:controller_layout_id
 
="@layout/id" ，指定control的佈局；如：

2.如果需要詳細的自定義播放介面，需要直播原始碼AP重寫SimpleExoPlayerView，和PlaybackControlView。

3.重要的類

/**
 * 監聽播放狀態
 */
 
private final class ComponentListener implements ExoPlayer.EventListener {
 
    @Override
    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
    
        
 
switch (playbackState) {
            /**
             * The player is able to immediately 
             /*play from its current position. The player will be playing if
             * {@link #getPlayWhenReady()} is true, and paused otherwise.
             */
             
            case Player.STATE_READY://
 
                showLoading(false);
                play(playWhenReady);
                break;
            /**
             * The player has finished playing the media.
             */
            case Player.STATE_ENDED:
                showLoading(false);
                playDefault();
                break;
            /**
             * The player does not have any media to play.
             */
            case Player.STATE_IDLE:
                showLoading(true);
                break;
            /**
             * The player is not able to 
             /*immediately play from its current position. This state typically
             * occurs when more data needs to be loaded.
             */
            case Player.STATE_BUFFERING:
                showLoading(true);
                break;
        }
    }
 
 
    @Override
    public void onRepeatModeChanged(int repeatMode) {
        // Do nothing.
    }
 
    @Override
    public void onPositionDiscontinuity() {
        // Do nothing.
    }
 
    @Override
    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
        // Do nothing.
    }
 
    @Override
    public void onTimelineChanged(Timeline timeline, Object manifest) {
        // Do nothing.
    }
 
    @Override
    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
        // Do nothing.
    }
 
    @Override
    public void onLoadingChanged(boolean isLoading) {
        // Do nothing.
    }
 
    @Override
    public void onPlayerError(ExoPlaybackException error) {
        // Do nothing.
    }
 
 
}

4.重要的方法：

/**
 * 根據不同的Uri檔案，生成不同的MediaSource
 *
 * @param uri
 * @param overrideExtension
 * @return
 */
 
private MediaSource buildMediaSource(Uri uri, String overrideExtension) {
    int type = Util.inferContentType(!TextUtils.isEmpty(overrideExtension) ? 
    "." + overrideExtension
            : uri.getLastPathSegment());
    switch (type) {
        case C.TYPE_SS:
            return new SsMediaSource(uri, buildDataSourceFactory(false),
                    new DefaultSsChunkSource.Factory(mediaDataSourceFactory), null, null);
        case C.TYPE_DASH:
            return new DashMediaSource(uri, buildDataSourceFactory(false),
                    new DefaultDashChunkSource.Factory(mediaDataSourceFactory), null, null);
        case C.TYPE_HLS:
            return new HlsMediaSource(uri, mediaDataSourceFactory, null, null);
        case C.TYPE_OTHER:
            return new ExtractorMediaSource(uri, mediaDataSourceFactory, new DefaultExtractorsFactory(),
                    null, null);
        default: {
            throw new IllegalStateException("Unsupported type: " + type);
        }
    }
}

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