Question

我正在构建视频播放器android应用，我想向视频添加字幕，代码已成功运行并且字幕可以正确显示，但是当我通过将exoplayerView布局添加到我的项目中使用自定义视图时字幕消失了。所以应该添加什么以使字幕与自定义一起出现视图注意：我正在使用exoplayer2 这是我的代码：

public class MainActivity extends AppCompatActivity {

private boolean isShowingTrackSelectionDialog;
private SimpleExoPlayer player;
private SimpleExoPlayerView simpleExoPlayerView;
private ImageButton quality;
private TrackSelector trackSelector;
private Uri videoUri;
private Uri subtitleUri;



public void setVideoUri(String videoUri) {
    this.videoUri = Uri.parse(videoUri);
}


public void setSubtitleUri(String subtitleUri) {
    this.subtitleUri = Uri.parse(subtitleUri);
}




@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //set link
    setSubtitleUri("https://firebasestorage.googleapis.com/v0/b/findandfix-2f4a9.appspot.com/o/Despacito%20Remix%20Luis%20Fonsi%20ft.Daddy%20Yankee%20Justin%20Bieber%20Lyrics%20%5BSpanish%5D.srt?alt=media&token=63344d04-af1c-4e2c-9d15-381bf7159308");
    setVideoUri("http://halasat2.vodu.me:80/vod/playlist_2_77636562545130.json/master.m3u8");

    //find view by id
    simpleExoPlayerView = findViewById(R.id.exoplayer);
    PlaybackControlView controlView = simpleExoPlayerView.findViewById(R.id.exo_controller);
    quality = controlView.findViewById(R.id.q);


    ///???????????
    DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter(); //test
    TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
    LoadControl loadControl = new DefaultLoadControl();


    //  Create the player

    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);



    // Bind the player to the view.
    simpleExoPlayerView.setPlayer(player);

    // Produces DataSource instances through which media data is loaded.
    DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "exoplayer2example"), bandwidthMeter);


    //FOR LIVESTREAM LINK:
    // MediaSource videoSource =new HlsMediaSource(videoUri,dataSourceFactory,1,null,null);
    MediaSource videoSource = new HlsMediaSource.Factory(dataSourceFactory).createMediaSource(videoUri);

    // Build the subtitle MediaSource.
    Format subtitleFormat = Format.createTextSampleFormat(null, // An identifier for the track. May be null.
            MimeTypes.APPLICATION_SUBRIP, // The mime type. Must be set correctly.
            Format.NO_VALUE,
            "en",
            null); // The subtitle language. May be null.

    MediaSource subtitleSource = new SingleSampleMediaSource.Factory(dataSourceFactory).createMediaSource(subtitleUri, subtitleFormat, C.TIME_UNSET);
    //merging the video with subTitle
    MergingMediaSource mergedSource = new MergingMediaSource(videoSource, subtitleSource);
    //set the player to view
    simpleExoPlayerView.setPlayer(player);
    //prepare video with sub title
    player.prepare(mergedSource);


    //auto play
    player.setPlayWhenReady(false);
    changeQuality();
}

private void changeQuality() {
    quality.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!isShowingTrackSelectionDialog
                    && TrackSelectionDialog.willHaveContent((DefaultTrackSelector) trackSelector)) {
                isShowingTrackSelectionDialog = true;
                TrackSelectionDialog trackSelectionDialog =
                        TrackSelectionDialog.createForTrackSelector(
                                (DefaultTrackSelector) trackSelector,
                                /* onDismissListener= */ dismissedDialog -> isShowingTrackSelectionDialog = false);
                trackSelectionDialog.show(getSupportFragmentManager(), /* tag= */ null);

            }
        }
    });

    simpleExoPlayerView.requestFocus();
}


//if the user close the activity then the video should pause also
@Override
protected void onPause() {
    super.onPause();
    //If Exo is ready, passing false you will pause the player
    player.setPlayWhenReady(false);
}


}

这是布局

<?xml version="1.0" encoding="utf-8"?><!-- Copyright (C) 2016 The Android Open Source Project
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
          http://www.apache.org/licenses/LICENSE-2.0
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <com.google.android.exoplayer2.ui.AspectRatioFrameLayout
        android:id="@id/exo_content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center">

        <!-- Video surface will be inserted as the first child of the content frame. -->

        <View
            android:id="@id/exo_shutter"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@android:color/black" />

        <ImageView
            android:id="@id/exo_artwork"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY" />



    </com.google.android.exoplayer2.ui.AspectRatioFrameLayout>

    <View
        android:id="@id/exo_controller_placeholder"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <com.google.android.exoplayer2.ui.SubtitleView
        android:id="@id/exo_subtitles"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <com.google.android.exoplayer2.ui.PlaybackControlView
        android:id="@id/exo_controller"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <FrameLayout
        android:id="@id/exo_overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</merge>

Answer 1

首先检查您的视频是否包含字幕，以及是否有字幕，然后将此行添加到活动的onCreate（）方法中

public static DefaultTrackSelector trackSelector;

DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory = new 
AdaptiveTrackSelection.Factory(bandwidthMeter);
trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

trackSelector.setParameters(new DefaultTrackSelector.ParametersBuilder()
                        .setRendererDisabled(C.TRACK_TYPE_VIDEO, false)
                        .build()
                );

这将显示字幕。如果您在C.TRACK_TYPE_VIDEO之后使用“ true”，那么它将禁用字幕并使它不可见

Answer 2

我只是遇到了同样的问题；就我而言，字幕MediaSource实际上正在加载，但是因为我没有使用ExoPlayerView，所以我需要添加一个TextOutput回调侦听器以将字幕手动绑定到我的自定义视图。

类似的东西：

player.addTextOutputListener(cues -> {
 
    if (cues.size() > 1) {
        Logger.w(TAG, "There are more than one cues available.");
    }

    if (subtitleTextView != null && !cues.isEmpty()) {
        // Since an srt file will only ever have one cue we can afford to get only the first one.
        subtitleTextView.setText(cues.get(0).text);
    }
    else {
        subtitleTextView.setText("");
    }
});

Exoplayer不显示字幕

2 个答案: