Question

我的应用创建了安排在不同时间安排的多个本地通知。这些通知都有不同的通知ID，当用户点击通知时，我的应用应该显示来自数据库的唯一记录。但是，我发现所有的水龙头都向我返回了相同的通知ID。该ID始终是我安排的最后一个通知的ID。有人知道为什么吗？

我创建了一个简化的sln来说明此问题。当用户单击单个按钮时，它将在4秒钟内创建4个唯一通知，但是当用户在4个通知中的每个选项卡上使用时，将重复显示相同的通知ID。下面是调试输出：

[0:] notificationId: 49617
[0:] notificationId: 49621
[0:] notificationId: 49622
[0:] notificationId: 49623
[0:] bundleContent: 49623
[0:] bundleContent: 49623
[0:] bundleContent: 49623
[0:] bundleContent: 49623

我的MainActivity：

////////////////////////////////// MainActivity.cs

using System;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Support.V4.App;
using Android.Support.V7.App;
using Android.Widget;

using Java.Lang;

using TaskStackBuilder = Android.Support.V4.App.TaskStackBuilder;

namespace Notifications
{
    [Activity(Label = "Notifications", MainLauncher = true, Icon = "@drawable/Icon")]
    public class MainActivity : AppCompatActivity
    {
        // Unique ID for our notification: 
        static readonly string CHANNEL_ID = "location_notification";
        internal static readonly string BUNDLE_DATA_KEY = "BUNDLE_DATA_KEY";

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);

            CreateNotificationChannel();

            // Display the "Hello World, Click Me!" button and register its event handler:
            var button = FindViewById<Button>(Resource.Id.MyButton);
            button.Click += ButtonOnClick;
        }

        // Handler for button click events.
        void ButtonOnClick(object sender, EventArgs eventArgs)
        {
            CreateNotification();
            CreateNotification();
            CreateNotification();
            CreateNotification();
        }

        // Create notification with a unique ID after sleeping for one second
        void CreateNotification()
        {
            // Sleep for a second
            System.Threading.Thread.Sleep(1000);

            double running;
            int notificationId;

            Intent resultIntent;
            Bundle valuesForActivity;
            TaskStackBuilder stackBuilder;
            NotificationManagerCompat notificationManager = NotificationManagerCompat.From(this);
            NotificationCompat.Builder builder;
            PendingIntent resultPendingIntent;

            // Generate a unique notificationId
            running = DateTime.Now.Subtract(new DateTime(2018, 12, 30, 0, 0, 0)).TotalSeconds;
            notificationId = (int)running;
            System.Diagnostics.Debug.Write(notificationId.ToString(), "notificationId");

            // Create the value bundle
            valuesForActivity = new Bundle();
            valuesForActivity.PutInt(BUNDLE_DATA_KEY, notificationId);

            // When the user clicks the notification, SecondActivity will start up.
            resultIntent = new Intent(this, typeof(SecondActivity));

            // Pass some values to SecondActivity:
            resultIntent.PutExtras(valuesForActivity);

            // Construct a back stack for cross-task navigation:
            stackBuilder = TaskStackBuilder.Create(this);
            stackBuilder.AddParentStack(Class.FromType(typeof(SecondActivity)));
            stackBuilder.AddNextIntent(resultIntent);

            // Create the PendingIntent with the back stack:            
            resultPendingIntent = stackBuilder.GetPendingIntent(0, (int)PendingIntentFlags.UpdateCurrent);

            // Build the notification:
            builder = new NotificationCompat.Builder(this, CHANNEL_ID)
                          .SetAutoCancel(true) // Dismiss the notification from the notification area when the user clicks on it
                          .SetContentIntent(resultPendingIntent) // Start up this activity when the user clicks the intent.
                          .SetContentTitle("Button Clicked") // Set the title
                          .SetNumber(1) // Display the count in the Content Info
                          .SetSmallIcon(Resource.Drawable.ic_stat_button_click) // This is the icon to display
                          .SetContentText($"The number is {notificationId}."); // the message to display.

            // Finally, publish the notification:
            notificationManager.Notify(notificationId, builder.Build());
        }

        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 name = Resources.GetString(Resource.String.channel_name);
            var description = GetString(Resource.String.channel_description);
            var channel = new NotificationChannel(CHANNEL_ID, name, NotificationImportance.Default)
                          {
                              Description = description
                          };

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

我的SecondActivity：

////////////////////////////////// SecondActivity.cs

using System;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Support.V7.App;
using Android.Widget;

namespace Notifications
{
    [Activity(Label = "Second Activity")]
    public class SecondActivity : AppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Get the count value passed to us from MainActivity:
            int contentInsideBundle = Intent.Extras.GetInt(MainActivity.BUNDLE_DATA_KEY, -1);

            // Display the count sent from the first activity:
            SetContentView(Resource.Layout.Second);
            var txtView = FindViewById<TextView>(Resource.Id.textView1);
            txtView.Text = $"The number was {contentInsideBundle}.";

            // Write Debug
            System.Diagnostics.Debug.Write(contentInsideBundle.ToString(), "bundleContent");
        }
    }
}

Answer 1

resultPendingIntent = stackBuilder.GetPendingIntent（0，（int）PendingIntentFlags.UpdateCurrent）;

Extra将被更新为最后一个传入Intent的Extra，因此您将获得相同的NotificationId。如果需要为每个通知获取正确的ID，则在定义意图时，还需要区分意图！您可以在意图下添加代码，如下所示：

    public function showajax($id){
       $modules= modules::where('project_id',$id)->get();

    foreach($modules as $row)
    {
        $html[]=
              '<td>' . $row->id . '</td>' .
                 '<td>' . $row->title . '</td>' .
                 '<td>' . $row->status. '</td>'.
                 '<br/>';
    }  

     return Response::json($html);

}

单击多个本地通知时，Xamarin.Android始终返回相同的通知ID

1 个答案: