从Smarthpone扬声器而不是Android Auto扬声器播放声音 [英] Sound Plays from Smarthpone Speakers instead Android Auto Speakers

问题描述

我是Android Auto的新手，但仍在尝试找出答案. 我已经成功地通过自己的编程应用程序播放了音乐，但是音乐是从智能手机扬声器而不是汽车扬声器发出的.其他(示例)应用程序则以正确的方式进行操作.

I am new to Android Auto and still trying to figure it out. I have successfully played music from my own programmed app but the music is coming out from my smartphone speakers instead of car speakers. Other (sample) apps do it the right way.

媒体系统的哪个部分负责处理此行为? Android文档说声音被发送到车载扬声器.

Which part of of the Media System is responsible to handle this behaviour? Android documentation says the sound is sent to the car speakers.

   @Override
    public void onPlayFromMediaId(String mediaId, Bundle extras) {

        this.mPlayingQueue.add(item);
        session.setActive(true);
        session.setQueue(mPlayingQueue);
        session.setQueueTitle("My Queue");
        session.setPlaybackState(buildState(PlaybackState.ACTION_PLAY));
        session.setMetadata(createRammsteinMetaData());

        this.mediaPlayer = MediaPlayer.create(getBaseContext(), R.raw.rammstein_sonne);
        this.mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);


        if (tryToGetAudioFocus()) {
            this.mediaPlayer.start();
            Log.d("AUDIOTAG", "Playing");
        } else {
            Log.d("AUDIOTAG", "Playing not possible, no focus");
        }
    }

    private boolean tryToGetAudioFocus() {
        int result = audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
        return result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
    }

先谢谢了.奥林普(Orrimp)

Thanks in advance. Orrimp

推荐答案

似乎有一个很大的错误！使用MediaPlayer.create(...);

There seems to be a pretty big bug there! Local music from resources does not play properly using MediaPlayer.create(...);

Thx Reaz Murshed 我只是尝试将STREAM_MUSIC用作Internet音乐的真实流，并且它可以正常工作. 转换为将setDataSource与资源URI一起使用！ 使用以下代码段:

Thx Reaz Murshed I just tried to use the STREAM_MUSIC as a real stream with Internet Music and it works. Translate to use setDataSource with Resource URI! Use the following snippet:

    @Override
    public void onPlayFromMediaId(String mediaId, Bundle extras) {

        /* Set session stuff like queue, metadata and so on*/

        Uri myUri = resourceToUri(getBaseContext(), R.raw.rammstein_sonne);
        try {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setDataSource(getBaseContext(), myUri);
            mediaPlayer.prepareAsync();
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    if (tryToGetAudioFocus()) {
                        mediaPlayer.start();
                        Log.d("AUDIOTAG", "Playing");
                    } else {
                        Log.d("AUDIOTAG", "Playing not possible, no focus");
                    }
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
            Log.d("AUTO", "EERORROR");
        }
    }

    public Uri resourceToUri(Context context, int resID) {
        return Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" +
                context.getResources().getResourcePackageName(resID) + '/' +
                context.getResources().getResourceTypeName(resID) + '/' +
                context.getResources().getResourceEntryName(resID));
    }

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