我在 Android 中有一个前台服务设置。我想更新通知文本。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？更新通知的最佳做法是什么？任何示例代码将不胜感激。

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);

    }

我正在我的主要 Activity 中创建服务，如下所示:

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

最佳答案

当您想更新由 startForeground() 设置的通知时，只需构建一个新的通知，然后使用 NotificationManager 通知它。

关键点是使用相同的通知ID。

我没有测试重复调用startForeground()更新Notification的场景，但我认为使用NotificationManager.notify会更好。

更新通知不会将服务从前台状态中移除(这只能通过调用 stopForground 来完成)；

例子:

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){
    // The PendingIntent to launch our activity if the user selects
    // this notification
    CharSequence title = getText(R.string.title_activity);
    PendingIntent contentIntent = PendingIntent.getActivity(this,
            0, new Intent(this, MyActivity.class), 0);

    return new Notification.Builder(this)
            .setContentTitle(title)
            .setContentText(text)
            .setSmallIcon(R.drawable.ic_launcher_b3)
            .setContentIntent(contentIntent).getNotification();     
}

/**
 * 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);
}

documentation状态

To set up a notification so it can be updated, issue it with a notification ID by calling NotificationManager.notify(). To update this notification after you've issued it, update or create a NotificationCompat.Builder object, build a Notification object from it, and issue the Notification with the same ID you used previously. If the previous notification is still visible, the system updates it from the contents of the Notification object. If the previous notification has been dismissed, a new notification is created instead.

关于android - 如何更新 Android 中前台服务的通知文本？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5528288/