blocks|key|945090|text|我认为使用相同的惟一ID和使用新信息的Notification再次调用startForeground()是可行的，尽管我还没有尝试过这种情况。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|945091|更新:根据评论，您应该使用NotifcationManager更新通知，您的服务将继续停留在前台模式。看看下面的答案。|945092|entityMap^0|J|C|Z|H|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I would think that calling <code>startForeground()</code> again with the same unique ID and a <code>Notification</code> with the new information would work, though I have not tried this scenario.

Update: Based on the comments, you should use NotifcationManager to update the notification and your service continues to stay in the foreground mode. Take a look at the answer below.

blocks|key|729038|text|改进了安卓8.0%2B中的Luca+Manzo+answer，当更新通知时，它将发出声音并显示为平视。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|729039|为了防止出现这种情况，您需要添加setOnlyAlertOnce(true)|offset|length|style|CODE|729040|所以代码是：|729041|private+static+final+int+NOTIF_ID=1;

@Override
public+void+onCreate(){
++++++++this.startForeground();
}

private+void+startForeground(){
++++++++startForeground(NOTIF_ID,getMyActivityNotification(""));
}

private+Notification+getMyActivityNotification(String+text){
++++++++if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){
++++++++((NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(
++++++++NotificationChannel("timer_notification","Timer+Notification",NotificationManager.IMPORTANCE_HIGH))
}

++++++++//+The+PendingIntent+to+launch+our+activity+if+the+user+selects
++++++++//+this+notification
++++++++PendingIntent+contentIntent=PendingIntent.getActivity(this,
++++++++0,new+Intent(this,MyActivity.class),0);

++++++++return+new+NotificationCompat.Builder(this,"my_channel_01")
++++++++.setContentTitle("some+title")
++++++++.setContentText(text)
++++++++.setOnlyAlertOnce(true)+//+so+when+data+is+updated+don't+make+sound+and+alert+in+android+8.0%2B
++++++++.setOngoing(true)
++++++++.setSmallIcon(R.drawable.ic_launcher_b3)
++++++++.setContentIntent(contentIntent)
++++++++.build();
}

/**
+*+This+is+the+method+that+can+be+called+to+update+the+Notification
+*/
private+void+updateNotification(){
++++++++String+text="Some+text+that+will+update+the+notification";

++++++++Notification+notification=getMyActivityNotification(text);

++++++++NotificationManager+mNotificationManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
++++++++mNotificationManager.notify(NOTIF_ID,notification);
}|code-block|syntax|javascript|729042|entityMap^0|0|G|M|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|V|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Improving on Luca Manzo answer in android 8.0+ when updating the notification it will make sound and show as Heads-up. 
to prevent that you need to add <code>setOnlyAlertOnce(true)</code>

so the code is:

<pre><code>private static final int NOTIF_ID=1;

@Override
public void onCreate(){
 this.startForeground();
}

private void startForeground(){
 startForeground(NOTIF_ID,getMyActivityNotification(""));
}

private Notification getMyActivityNotification(String text){
 if(Build.VERSION.SDK_INT&gt;=Build.VERSION_CODES.O){
 ((NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(
 NotificationChannel("timer_notification","Timer Notification",NotificationManager.IMPORTANCE_HIGH))
}

 // The PendingIntent to launch our activity if the user selects
 // this notification
 PendingIntent contentIntent=PendingIntent.getActivity(this,
 0,new Intent(this,MyActivity.class),0);

 return new NotificationCompat.Builder(this,"my_channel_01")
 .setContentTitle("some title")
 .setContentText(text)
 .setOnlyAlertOnce(true) // so when data is updated don't make sound and alert in android 8.0+
 .setOngoing(true)
 .setSmallIcon(R.drawable.ic_launcher_b3)
 .setContentIntent(contentIntent)
 .build();
}

/**
 * This is the method that can be called to update the Notification
 */
private void updateNotification(){
 String text="Some text that will update the notification";

 Notification notification=getMyActivityNotification(text);

 NotificationManager mNotificationManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
 mNotificationManager.notify(NOTIF_ID,notification);
}
</code></pre>

blocks|key|729092|text|似乎没有一个现有的答案显示了如何处理完整的情况-如果是第一次调用，则发送给startForeground，但会更新后续调用的通知。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|729093|您可以使用以下模式来检测正确的情况：|729094|private+void+notify(@NonNull+String+action)+{
++++boolean+isForegroundNotificationVisible+=+false;
++++NotificationManager+notificationManager+=+(NotificationManager)+getSystemService(NOTIFICATION_SERVICE);
++++StatusBarNotification[]+notifications+=+notificationManager.getActiveNotifications();
++++for+(StatusBarNotification+notification+:+notifications)+{
++++++++if+(notification.getId()+==+FOREGROUND_NOTE_ID)+{
++++++++++++isForegroundNotificationVisible+=+true;
++++++++++++break;
++++++++}
++++}
++++Log.v(getClass().getSimpleName(),+"Is+foreground+visible:+"+%2B+isForegroundNotificationVisible);
++++if+(isForegroundNotificationVisible){
++++++++notificationManager.notify(FOREGROUND_NOTE_ID,+buildForegroundNotification(action));
++++}+else+{
++++++++startForeground(FOREGROUND_NOTE_ID,+buildForegroundNotification(action));
++++}
}|code-block|syntax|javascript|729095|此外，您还需要像在其他答案中一样构建通知和通道：|729096|private+Notification+buildForegroundNotification(@NonNull+String+action)+{
++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.O)+{
++++++++createNotificationChannel();
++++}
++++//Do+any+customization+you+want+here
++++String+title;
++++if+(ACTION_STOP.equals(action))+{
++++++++title+=+getString(R.string.fg_notitifcation_title_stopping);
++++}+else+{
++++++++title+=+getString(R.string.fg_notitifcation_title_starting);
++++}
++++//then+build+the+notification
++++return+new+NotificationCompat.Builder(this,+CHANNEL_ID)
++++++++++++.setSmallIcon(R.mipmap.ic_launcher)
++++++++++++.setContentTitle(title)
++++++++++++.setOngoing(true)
++++++++++++.build();
}

@RequiresApi(Build.VERSION_CODES.O)
private+void+createNotificationChannel(){
++++NotificationChannel+chan+=+new+NotificationChannel(CHANNEL_ID,+getString(R.string.fg_notification_channel),+NotificationManager.IMPORTANCE_DEFAULT);
++++chan.setLightColor(Color.RED);
++++chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
++++NotificationManager+manager+=+(NotificationManager)+getSystemService(Context.NOTIFICATION_SERVICE);
++++assert+manager+!=+null;
++++manager.createNotificationChannel(chan);
}|729097|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It seems none of the existing answers show how to handle the full case - to startForeground if it's the first call but update the notification for subsequent calls.

You can use the following pattern to detect the right case:

<pre><code>private void notify(@NonNull String action) {
 boolean isForegroundNotificationVisible = false;
 NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 StatusBarNotification[] notifications = notificationManager.getActiveNotifications();
 for (StatusBarNotification notification : notifications) {
 if (notification.getId() == FOREGROUND_NOTE_ID) {
 isForegroundNotificationVisible = true;
 break;
 }
 }
 Log.v(getClass().getSimpleName(), "Is foreground visible: " + isForegroundNotificationVisible);
 if (isForegroundNotificationVisible){
 notificationManager.notify(FOREGROUND_NOTE_ID, buildForegroundNotification(action));
 } else {
 startForeground(FOREGROUND_NOTE_ID, buildForegroundNotification(action));
 }
}
</code></pre>

Additionally you need to build the notification and channel as in other answers:

<pre><code>private Notification buildForegroundNotification(@NonNull String action) {
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.O) {
 createNotificationChannel();
 }
 //Do any customization you want here
 String title;
 if (ACTION_STOP.equals(action)) {
 title = getString(R.string.fg_notitifcation_title_stopping);
 } else {
 title = getString(R.string.fg_notitifcation_title_starting);
 }
 //then build the notification
 return new NotificationCompat.Builder(this, CHANNEL_ID)
 .setSmallIcon(R.mipmap.ic_launcher)
 .setContentTitle(title)
 .setOngoing(true)
 .build();
}

@RequiresApi(Build.VERSION_CODES.O)
private void createNotificationChannel(){
 NotificationChannel chan = new NotificationChannel(CHANNEL_ID, getString(R.string.fg_notification_channel), NotificationManager.IMPORTANCE_DEFAULT);
 chan.setLightColor(Color.RED);
 chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
 NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 assert manager != null;
 manager.createNotificationChannel(chan);
}
</code></pre>

I have a foreground service setup in Android. I would like to update the notification text. I am creating the service as shown below.

How can I update the notification text that is setup within this foreground service? What is the best practise for updating the notification? Any sample code would be appreciated.

<pre><code>public class NotificationService extends Service {

 private static final int ONGOING_NOTIFICATION = 1;

 private Notification notification;

 @Override
 public void onCreate() {
 super.onCreate();

 this.notification = new Notification(R.drawable.statusbar, getText(R.string.app_name), System.currentTimeMillis());
 Intent notificationIntent = new Intent(this, AbList.class);
 PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
 this.notification.setLatestEventInfo(this, getText(R.string.app_name), "Update This Text", pendingIntent);

 startForeground(ONGOING_NOTIFICATION, this.notification);

 }
</code></pre>

I am creating the service in my main activity as shown below:

<pre><code> // Start Notification Service
 Intent serviceIntent = new Intent(this, NotificationService.class);
 startService(serviceIntent);
</code></pre>

How do I update the notification text for a foreground service in Android?

Android

我有一个Android的前台服务设置。我想要更新通知文本。我正在创建如下所示的服务。如何更新在此前台服务中设置的通知文本？更新通知的最佳实践是什么？任何示例代码都将不胜感激。public class NotificationService extends Service {    private static fina...

问如何更新Android前台服务的通知文本？
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