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我在我的 android sender 应用程序中使用 cast SDK v3，它运行良好，但默认情况下音量控制按钮不控制投射设备的音量。我必须扩大音量控制弹出窗口并调整投射设备音量。当投射会话恢复时，它直接控制设备的音量。但是一旦播放状态改变，它就会失去焦点。

private class CastSessionManagerListener implements SessionManagerListener<CastSession> {

    @Override
    public void onSessionStarting(CastSession session) {
    }

    @Override
    public void onSessionStarted(CastSession session, String sessionId) {
        // In case we are casting, send the device name as an extra on MediaSession metadata.
        // Now we can switch to CastPlayback
        EventHelper.eventFeatureClicked(EventHelper.FEATURE_CHROME_CAST);
        Playback playback = new CastPlayback(MusicService.this);
        mMediaRouter.setMediaSessionCompat(mSession);
        mPlaybackManager.switchToPlayback(playback, true);
    }

    @Override
    public void onSessionStartFailed(CastSession session, int error) {

    }

    @Override
    public void onSessionEnding(CastSession session) {
        // This is our final chance to update the underlying stream position
        // In onSessionEnded(), the underlying CastPlayback#mRemoteMediaClient
        // is disconnected and hence we update our local value of stream position
        // to the latest position.
        mPlaybackManager.getPlayback().updateLastKnownStreamPosition();
    }

    @Override
    public void onSessionEnded(CastSession session, int error) {
        Playback playback = new LocalPlayback(MusicService.this);
        mMediaRouter.setMediaSessionCompat(null);
        mPlaybackManager.switchToPlayback(playback, true);
    }

    @Override
    public void onSessionResuming(CastSession session, String sessionId) {
    }

    @Override
    public void onSessionResumed(CastSession session, boolean wasSuspended) {
        EventHelper.eventFeatureClicked(EventHelper.FEATURE_CHROME_CAST);
        Playback playback = new CastPlayback(MusicService.this);
        mMediaRouter.setMediaSessionCompat(mSession);
        mPlaybackManager.switchToPlayback(playback, true);
    }

    @Override
    public void onSessionResumeFailed(CastSession session, int error) {
    }

    @Override
    public void onSessionSuspended(CastSession session, int reason) {
    }
}
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1 回答 1

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我相信如果您的MediaSession或MediaSessionCompat设置为活动状态，就会发生这种情况。投射或远程播放时，应使其处于非活动状态。

于 2019-07-08T15:08:03.807 回答