import com.spotify.sdk.android.player.ConnectionStateCallback; //导入依赖的package包/类
/***
 * @param context
 * @param token                      : Spotify token needed to use the api
 * @param observer                   : used to know when player is ready
 * @param playerNotificationCallback
 * @param connectionStateCallback
 */
public static void startPlayer(final Context context, String token, final Player.InitializationObserver observer, @Nullable final PlayerNotificationCallback playerNotificationCallback, @Nullable final ConnectionStateCallback connectionStateCallback) {
    SpotifyPlayerManager.context = context;
    Config playerConfig = new Config(context, token, SpotifyManager.API_KEY);
    setConnectionStateCallback(connectionStateCallback);
    setPlayerNotificationCallback(playerNotificationCallback);
    Spotify.getPlayer(playerConfig, context, new Player.InitializationObserver() {
        @Override
        public void onInitialized(Player pl) {
            player = pl;
            if (connectionStateCallback != null)
                player.addConnectionStateCallback(SpotifyManager.connectionStateCallback);
            if (playerNotificationCallback != null)
                player.addPlayerNotificationCallback(SpotifyManager.playerNotificationCallback);
            observer.onInitialized(player);
        }

        @Override
        public void onError(Throwable throwable) {
            Log.e(SpotifyManager.class.getSimpleName(), "Could not initialize player: " + throwable.getMessage());
            observer.onError(throwable);

        }
    });
}
 

import com.spotify.sdk.android.player.ConnectionStateCallback; //导入依赖的package包/类
/***
 * Set the callback on the connection player (will be used to have information about the playing status)
 *
 * @param connectionCallback
 */
private static void setConnectionStateCallback(ConnectionStateCallback connectionCallback) {
    SpotifyManager.connectionStateCallback = connectionCallback;
}