Bad notification for startForeground error: invalid service notification

Question

启动前台服务时出现此错误：

Java.Lang.RuntimeException: Bad notification for startForeground: java.lang.RuntimeException: invalid service notification: Notification(channel=channelSocketIOService pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x42 color=0x00000000 vis=PRIVATE)
  --- End of managed Java.Lang.RuntimeException stack trace ---
android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid service notification: Notification(channel=channelSocketIOService pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x42 color=0x00000000 vis=PRIVATE)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1945)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:214)
    at android.app.ActivityThread.main(ActivityThread.java:7356)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
 /end;

服役中class:

private void RegisterForegroundService()
{
    Notification notification = new NotificationCompat.Builder(this, $"ServiceNotifications")
        .SetOngoing(true)
        .Build();

    StartForeground(462, notification);
}

感谢您的帮助

Answer 1

您需要在 Android 8 及更高版本中创建默认通知渠道。否则你会得到这个错误。更多详细信息，请访问

Answer 2

从文献Create and Manage Notification Channels，我们会知道：

Starting in Android 8.0 (API level 26), all notifications must be assigned to a channel. For each channel, you can set the visual and auditory behavior that is applied to all notifications in that channel. Then, users can change these settings and decide which notification channels from your app should be intrusive or visible at all.

在xamarin android平台，可以查看文档Notifications in Xamarin.Android.

上面的代码中包含一个示例。您可以在这里查看：https://github.com/xamarin/monodroid-samples/tree/master/LocalNotifications .

主要代码为：

public class MainActivity : AppCompatActivity
{
    // Unique ID for our notification: 
    static readonly int NOTIFICATION_ID = 1000;
    static readonly string CHANNEL_ID = "location_notification";
    internal static readonly string COUNT_KEY = "count";

    // Number of times the button is tapped (starts with first tap):
    int count = 1;

    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)
    {
        // Pass the current button press count value to the next activity:
        var valuesForActivity = new Bundle();
        valuesForActivity.PutInt(COUNT_KEY, count);

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

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

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

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

        // Build the notification:
        var 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(count) // Display the count in the Content Info
                      .SetSmallIcon(Resource.Drawable.ic_stat_button_click) // This is the icon to display
                      .SetContentText($"The button has been clicked {count} times."); // the message to display.

        // Finally, publish the notification:
        var notificationManager = NotificationManagerCompat.From(this);
        notificationManager.Notify(NOTIFICATION_ID, builder.Build());

        // Increment the button press count:
        count++;
    }

    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);
    }
}

Answer 3

解法：

转到 Android-设置 > 构建
关闭代码优化
构建解决方案
重新开启代码优化

为我工作但不知道为什么

Bad notification for startForeground error: invalid service notification

Bad notification for startForeground error: invalid service notification

xamarin.android

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