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Notification.Builder?builder?=?new?Notification.Builder(this)
????????.setAutoCancel(true)
????????.setChannelId("test_channel_id")
????????.setContentTitle("新消息來了")
????????.setContentText("明天是周末...

//?加上這個方法
private?NotificationManager?getManager(){
????if?(manager?==?null){
????????manager?=?(NotificationManager)?getSystemService(Context.NOTIFICATION_SERVICE);
????}
????return?manager;
}