今天看Android書上關於Notification的程式碼

  <span style="white-space:pre">	</span>Intent i = new Intent(this,NotificationActivity.class);
        i.putExtra("notificationID",notificationID);

        PendingIntent pendingIntent = PendingIntent.getActivity(this,0,i,0);

        NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        Notification notif = new Notification(
                R.mipmap.ic_launcher,
                "Reminder:Meeting starts in 5 minutes",
                System.currentTimeMillis());

        CharSequence from = "System Alarm";
        CharSequence message = "Meeting with customer at 3pm...";
        notif.setLatestEventInfo(this,from,message,pendingIntent);
  <span style="white-space:pre">	</span>notif.vibrate = new long[]{100,250,100,500};
        nm.notify(notificationID,notif);
 

參照文件，我這樣寫了。

 Notification notif = new Notification.Builder(this)
                .setContentIntent(pendingIntent)
                .setTicker("Reminder:Meeting starts in 5 minutes")
                .setContentTitle("System Alarm")
                .setContentText("Meeting with customer at 3pm...")
                .build();
 

後來在 這裡 找到了這樣的話：

A Notification object must contain the following:

A small icon, set by setSmallIcon()
A title, set by setContentTitle()
Detail text, set by setContentText()

 Notification notif = new Notification.Builder(this)
                .setContentIntent(pendingIntent)
                .setTicker("Reminder:Meeting starts in 5 minutes")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("System Alarm")
                .setContentText("Meeting with customer at 3pm...")
                .build();
 

setContentTitle() 或 setContentText()

但是，不呼叫

setTicker("Reminder:Meeting starts in 5 minutes")

如果不呼叫 

<strong>setSmallIcon(R.mipmap.ic_launcher)</strong>

上圖：