Java 通过单击前台服务通知显示当前活动

如何通过单击通知显示前台服务活动？当我使用我的代码时，它会启动新的活动，但我需要活动，服务在哪里工作。以下是我的代码（Android Oreo）：

在OnCreate的主活动中：

 protected override void OnCreate(Bundle savedInstanceState)
        {
            if (!APSService.isRunning)
            {
                createNotificationChannel();
                startService();
            }
            else
            {
                NotificationChannel serviceChannel = new NotificationChannel
                       (
                           CHANNEL_ID,
                           "APS service Channel",
                           NotificationImportance.Default
                       );
                notificationManager = (NotificationManager)GetSystemService(Java.Lang.Class.FromType((typeof(NotificationManager))));
                notificationManager.CreateNotificationChannel(serviceChannel);
                UpdateNotification("Loading...");
                APSService.isRunning = true;

            }
}

---

我希望你能帮助解决这个问题。非常感谢。

我不清楚您想开展什么活动

如何显示前台服务活动

前台服务独立于应用程序运行

您正在此处启动Main活动：

Intent notificationIntent = new Intent(this,Java.Lang.Class.FromType((typeof(MainActivity))));

你能澄清一下你想在这里做什么吗

---

ps：我知道这不是一个答案，还不能评论

我写了一个演示，这是一个GIF

您可以实现如下代码所示的功能

 [Service]
class MyForegroundService : Service
{
    public const int SERVICE_RUNNING_NOTIFICATION_ID = 10000;

    [return: GeneratedEnum]
    public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
    {
        CreateNotificationChannel();
        string messageBody = "service starting";
       // / Create an Intent for the activity you want to start
       Intent resultIntent = new Intent(this,typeof(Activity1));
       // Create the TaskStackBuilder and add the intent, which inflates the back stack
       TaskStackBuilder stackBuilder = TaskStackBuilder.Create(this);
       stackBuilder.AddNextIntentWithParentStack(resultIntent);
       // Get the PendingIntent containing the entire back stack
       PendingIntent resultPendingIntent = stackBuilder.GetPendingIntent(0, PendingIntentFlags.UpdateCurrent);
       var notification = new Notification.Builder(this, "10111")
        .SetContentIntent(resultPendingIntent)
        .SetContentTitle("Foreground")
        .SetContentText(messageBody)
        .SetSmallIcon(Resource.Drawable.main)
        .SetOngoing(true)
        .Build();
        StartForeground(SERVICE_RUNNING_NOTIFICATION_ID, notification);
         //do you work
        return StartCommandResult.Sticky;


    }
    public override IBinder OnBind(Intent intent)
    {
        return null;
    }

    void CreateNotificationChannel()
    {
        if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {
            // Notification channels are new in API 26 (and not a part of the
            // support library). There is no need to create a notification
            // channel on older versions of Android.
            return;
        }

        var channelName = Resources.GetString(Resource.String.channel_name);
        var channelDescription = GetString(Resource.String.channel_description);
        var channel = new NotificationChannel("10111", channelName, NotificationImportance.Default)
        {
            Description = channelDescription
        };

        var notificationManager = (NotificationManager)GetSystemService(NotificationService);
        notificationManager.CreateNotificationChannel(channel);
    }

}

[服务]
类MyForegroundService:服务
{
public const int SERVICE_RUNNING_NOTIFICATION_ID=10000；
[返回：GeneratedEnum]
公共覆盖StartCommandResult OnStartCommand（意向意向，[GenerateDum]StartCommandFlags标志，int-startId）
{
CreateNotificationChannel（）；
字符串messageBody=“服务启动”；
///为要启动的活动创建意图
意向结果=新意向（此，类型为（活动1））；
//创建TaskStackBuilder并添加意图，这会使后堆栈膨胀
TaskStackBuilder stackBuilder=TaskStackBuilder.Create（此）；
stackBuilder.AddNextEntWithParentStack（ResultEnt）；
//获取包含整个后堆栈的Pending帐篷
PendingEvent ResultPendingEvent=stackBuilder.GetPendingEvent（0，PendingEventFlags.UpdateCurrent）；
var notification=new notification.Builder（这是“10111”）
.SetContentIntent（结果结束内容）
.SetContentTitle（“前景”）
.SetContentText（messageBody）
.SetSmallIcon（Resource.Drawable.main）
.正在进行（正确）
.Build（）；
StartForeground（服务运行通知ID，通知）；
//你工作吗
返回StartCommandResult.Sticky；
}
公共覆盖iBind OnBind（意图）
{
返回null；
}
void CreateNotificationChannel（）
{
if（Build.VERSION.SdkInt

这是我的演示。

 [Service]
class MyForegroundService : Service
{
    public const int SERVICE_RUNNING_NOTIFICATION_ID = 10000;

    [return: GeneratedEnum]
    public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
    {
        CreateNotificationChannel();
        string messageBody = "service starting";
       // / Create an Intent for the activity you want to start
       Intent resultIntent = new Intent(this,typeof(Activity1));
       // Create the TaskStackBuilder and add the intent, which inflates the back stack
       TaskStackBuilder stackBuilder = TaskStackBuilder.Create(this);
       stackBuilder.AddNextIntentWithParentStack(resultIntent);
       // Get the PendingIntent containing the entire back stack
       PendingIntent resultPendingIntent = stackBuilder.GetPendingIntent(0, PendingIntentFlags.UpdateCurrent);
       var notification = new Notification.Builder(this, "10111")
        .SetContentIntent(resultPendingIntent)
        .SetContentTitle("Foreground")
        .SetContentText(messageBody)
        .SetSmallIcon(Resource.Drawable.main)
        .SetOngoing(true)
        .Build();
        StartForeground(SERVICE_RUNNING_NOTIFICATION_ID, notification);
         //do you work
        return StartCommandResult.Sticky;


    }
    public override IBinder OnBind(Intent intent)
    {
        return null;
    }

    void CreateNotificationChannel()
    {
        if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {
            // Notification channels are new in API 26 (and not a part of the
            // support library). There is no need to create a notification
            // channel on older versions of Android.
            return;
        }

        var channelName = Resources.GetString(Resource.String.channel_name);
        var channelDescription = GetString(Resource.String.channel_description);
        var channel = new NotificationChannel("10111", channelName, NotificationImportance.Default)
        {
            Description = channelDescription
        };

        var notificationManager = (NotificationManager)GetSystemService(NotificationService);
        notificationManager.CreateNotificationChannel(channel);
    }

}