如何在android中使用GCM推送通知展示图片

dependencies {
    implementation 'com.google.android.gms:play-services-gcm:17.0.0'
}

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    // 解析推送通知内容
    String title = remoteMessage.getNotification().getTitle();
    String message = remoteMessage.getNotification().getBody();
    String imageUrl = remoteMessage.getData().get("image_url");

    // 下载图片
    Bitmap bitmap = downloadImage(imageUrl);

    // 创建通知
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
            .setSmallIcon(R.drawable.ic_notification)
            .setContentTitle(title)
            .setContentText(message)
            .setLargeIcon(bitmap)
            .setStyle(new NotificationCompat.BigPictureStyle().bigPicture(bitmap))
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);

    // 显示通知
    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
    notificationManager.notify(notificationId, builder.build());
}

private Bitmap downloadImage(String imageUrl) {
    // 使用网络请求库下载图片并返回Bitmap对象
    // ...
}