如何修改Media3自动生成的媒体通知（Java实现）

我使用Media3 1.0.0-rc01结合MediaSession Service构建了ExoPlayer，目前应用音频播放正常，系统自动生成的媒体通知也能正常显示，但我希望修改通知的文字颜色、背景色、图标及其他样式。

官方文档指出：要提供自定义通知，可通过DefaultMediaNotificationProvider.Builder创建MediaNotification.Provider，或自定义实现该Provider接口，再通过setMediaNotificationProvider将其添加到MediaSession中。

我已经创建了如下自定义Provider类：

package myapp;

import android.content.Context;
import android.os.Bundle;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.session.CommandButton;
import androidx.media3.session.DefaultMediaNotificationProvider;
import androidx.media3.session.MediaNotification;
import androidx.media3.session.MediaSession;
import com.google.common.collect.ImmutableList;

@UnstableApi
public class MyMediaNotificationProvider implements MediaNotification.Provider {

    private Context context;
    public MyMediaNotificationProvider(Context context) {
        this.context = context;
    }

    @Override
    public MediaNotification createNotification(
            MediaSession mediaSession,
            ImmutableList<CommandButton> customLayout,
            MediaNotification.ActionFactory actionFactory,
            Callback onNotificationChangedCallback) {

        // Create the notification
        return new DefaultMediaNotificationProvider(context).createNotification(
                mediaSession,
                customLayout,
                actionFactory,
                onNotificationChangedCallback);
    }

    @Override
    public boolean handleCustomCommand(
            MediaSession session,
            String action,
            Bundle extras) {
        return false;
    }

}

并在PlaybackService类中添加了setMediaNotificationProvider(new MyMediaNotificationProvider());来调用上述自定义类：

package myapp;

import android.net.Uri;
import androidx.media3.common.MediaItem;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.exoplayer.ExoPlayer;
import androidx.media3.session.MediaSession;
import androidx.media3.session.MediaSessionService;

@UnstableApi public class PlaybackService extends MediaSessionService {
    private MediaSession mediaSession = null;

    @Override
    public MediaSession onGetSession(MediaSession.ControllerInfo controllerInfo) {
        // If desired, validate the controller before returning the media session
        return mediaSession;
    }

    // Create your Player and MediaSession in the onCreate lifecycle event
    @Override
    public void onCreate() {
        super.onCreate();

        // Create the player and the mediasession
        ExoPlayer player = new ExoPlayer.Builder(this).build();
        mediaSession = new MediaSession.Builder(this, player).build();

        // Build the media item.
        Uri mp3 = Uri.parse("android.resource://myapp/raw/mysoundtoplay");
        MediaItem mediaItem = MediaItem.fromUri(mp3);
        // Set the media item to be played.
        player.setMediaItem(mediaItem);
        // loop mode
        player.setRepeatMode(player.REPEAT_MODE_ALL);
        // Prepare the player.
        player.prepare();
        // Play
        player.setPlayWhenReady(true);

        // CALL MY NEW CLASS TO CREATE NOTIFICATION
        Context context = getApplicationContext(); // context must be passed to class
        setMediaNotificationProvider(new MyMediaNotificationProvider(context));

    }

    // Remember to release the player and media session in onDestroy
    @Override
    public void onDestroy() {
        mediaSession.getPlayer().release();
        mediaSession.release();
        mediaSession = null;
        super.onDestroy();
    }
}

目前应用运行正常，但我还不清楚如何在现有代码基础上实现通知样式的定制（文字、颜色、图标等），希望能得到帮助。

内容的提问来源于stack exchange，提问作者Pepsi_34