上下文更改时，调用了3次Android Spotify远程SDK播放器状态订阅

Question

我一次连接到Spotify遥控器，但是好像我在调用remote.getPlayerApi().skipNext()，remote.getPlayerApi().skipPrevious()或remote.getPlayerApi.play(uri)时同时使用3-4个遥控器。做出上述远程命令后，remote.getPlayerApi().subscriptionToPlayerState()被快速连续调用3-4次。

但是，暂停和继续可以正常工作。请注意，所有这些都在前台服务上运行。

我尝试重新启动手机，但是发生了同样的事情。就像旧的遥控器没有正确断开连接，连接并执行订阅回调一样。

I basically did everything here供参考，以及代码的我的一面：

    // Set player state subscription to Spotify Remote SDK
    private void setupSpotifySubscriptions() {
        mSpotifyAppRemote.getPlayerApi().subscribeToPlayerState().setEventCallback(new Subscription.EventCallback<PlayerState>() {
            @Override
            public void onEvent(PlayerState playerState) {
                updatePlayerState(playerState);
            }
        });
    }


    // Update the player UI in Flutter
    private void updatePlayerState(PlayerState playerState) {
        HashMap<String, Object> payloadToServer = new HashMap<>();
        payloadToServer.put("position", playerState.playbackPosition);
        payloadToServer.put("duration", playerState.track.duration);
        payloadToServer.put("song_name", playerState.track.name);
        payloadToServer.put("song_artists", stringifyArtists(playerState.track.artists));
        payloadToServer.put("song_id", playerState.track.uri);
        payloadToServer.put("is_paused", playerState.isPaused);
        socket.emitToServer("player_state", payloadToServer);

    }

一旦我连接，就会出现来自Spotify远程的3-4条消息，这使我的假设看起来很合理：

D/RemoteServiceIo(32686): Connecting to Spotify service
D/RemoteServiceIo(32686): Message from Spotify: [2,4,{"authid":null,"authmethod":null,"authprovider":null,"authrole":null,"roles":{"broker":{},"caller":null,"dealer":{},"subscriber":null}}]
D/RemoteServiceIo(32686): Message from Spotify: [33,1,8]
D/RemoteServiceIo(32686): Message from Spotify: [36,8,28,{},[],{"long_text":"","short_text":"","code":0}]
D/MainActivity(32686): Connected! Yay!
D/RemoteServiceIo(32686): Message from Spotify: [33,2,9]
D/RemoteServiceIo(32686): Message from Spotify: [36,9,29,{},[],{"track":{"artist":{"name":"Jesper Ryom","type":"artist","uri":"spotify:artist:6QAXPFWafsrhltnhogrQ1P"},"artists":[{"name":"Jesper Ryom","type":"artist","uri":"spotify:artist:6QAXPFWafsrhltnhogrQ1P"}],"album":{"name":"Syvsover","type":"album","uri":"spotify:album:3Se55Em2mSqYwuQLqS7XDb"},"saved":false,"duration_ms":423586,"name":"Clock","uri":"spotify:track:6N6jCOPR4kEczFBMrgun5A","image_id":"content://com.spotify.music/image/Njc5YmIzMzYyYmM5YjhlODM3ZjU3NWQzODQ4Y2I0M2JkZTVjNmM5ZQ%3D%3D%0A","is_episode":false,"is_podcast":false},"is_paused":true,"playback_speed":0.0,"playback_position":67667,"playback_options":{"shuffle":false,"repeat":0},"playback_restrictions":{"can_skip_next":true,"can_skip_prev":false,"can_repeat_track":false,"can_repeat_context":false,"can_toggle_shuffle":false,"can_seek":true}}]

更新：

使用信号量的临时修复。但是，解决此问题仍然很高兴。

private void updatePlayerState(PlayerState playerState) throws InterruptedException {
    HashMap<String, Object> payloadToServer = new HashMap<>();
    payloadToServer.put("position", playerState.playbackPosition);
    payloadToServer.put("duration", playerState.track.duration);
    payloadToServer.put("song_name", playerState.track.name);
    payloadToServer.put("song_artists", stringifyArtists(playerState.track.artists));
    payloadToServer.put("song_id", playerState.track.uri);
    payloadToServer.put("is_paused", playerState.isPaused);
    if (available.tryAcquire()) {
        socket.emitToServer("player_state", payloadToServer);
    }
}

一旦收到套接字响应：

private Emitter.Listener onPlayerState = new Emitter.Listener() {
    @Override
    public void call(Object... args) {
        try {
            System.out.println("[onPlayerState] " + args[0].toString());
            HashMap<String, Object> playerState = new ObjectMapper().readValue(args[0].toString(), HashMap.class);
            methodChannel.invokeMethod(SPOTIFY + PLAYER_STATE, playerState);
            if(player_state.get("song_id") != playerState.get("song_id")){
                methodChannel.invokeMethod(POP_USER_QUEUE, playerState.get("song_id"));
                popUserQueue((String) playerState.get("song_id"));
            }
            player_state = playerState;
            releaseSemaphore();
        } catch (java.lang.Exception e) {
            System.out.println(e.toString());
        }
    }
};

private void releaseSemaphore(){
    new Thread(new Runnable() {
        public void run() {
            try {
                TimeUnit.MILLISECONDS.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            available.release();
        }
    }).start();
}