消息弹框用AlertDialog不就行了

Notification.Builder builder = new Notification.Builder(this)
        .setAutoCancel(true)
        .setChannelId("test_channel_id")
        .setContentTitle("新消息来了")
        .setContentText("明天是周末，不用上班？你怕是在做梦！")
        .setOnlyAlertOnce(true)
        .setSmallIcon(R.mipmap.ic_launcher);

manager.notify(1, builder.build());

new Thread(new Runnable() {
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            try {
                Thread.sleep(1000);
                builder.setProgress(100, i, false);

                manager.notify(1, builder.build());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }
}).start();

设置builder.setDefaults(Notification.FLAG_ONLY_ALERT_ONCE);这个是没有效果的