当点击通知应用程序在 Android [Xamarin.Forms] 中不运行 MainActivity

Question

我一直在尝试在我的 android 应用程序中实现重复的本地通知，并且我已经很好地实现了这一点（我相信）但是当我想单击我的通知并在其中执行逻辑时 1. 不启动 MainActivity（不启动我到应用程序） 2. 不执行任何逻辑

在我的 MainActivity.cs 文件中，我也将 LaunchMode 设置为 SingleTop 我有方法 OnNewIntent() 的相应覆盖，当我点击它时会收到我的通知，但它只是根本不执行该方法，即使

由于我实现了与我的共享代码项目通信的接口，我使用 BroadcastReceiver 发送我的通知，我在其他类中调用它而不是 MainActivity.cs（因为我看到很多人这样做）。

调用通知的方法：

public void ScheduleNotification(string title, string message, long seconds)
    {
        if (!channelInitialized)
            CreateNotificationChannel();

        NotificationReciever.title = title;
        NotificationReciever.message = message;
        AlarmManager alarmManager = (AlarmManager)AndroidApp.Context.GetSystemService(Context.AlarmService);
        Intent intent = new Intent(AndroidApp.Context, typeof(NotificationReciever));
        intent.PutExtra(TitleKey, title);
        intent.PutExtra(MessageKey, message);
        intent.AddFlags(ActivityFlags.ClearTop);

        PendingIntent pendingIntent = PendingIntent.GetBroadcast(AndroidApp.Context, 0, intent, PendingIntentFlags.UpdateCurrent);

        alarmManager.SetRepeating(AlarmType.ElapsedRealtimeWakeup, SystemClock.ElapsedRealtime() + seconds * 1000, 2000, pendingIntent);
    }

我的广播接收器：

[BroadcastReceiver(Enabled =true)]
    public class NotificationReciever : BroadcastReceiver
    {
        const string channelId = "default";
        public static string title = "";
        public static string message = "";
        const string channelName = "Default";
        const string channelDescription = "The default channel for notifications.";
        const int pendingIntentId = 0;

        public const string TitleKey = "title";
        public const string MessageKey = "message";

        int messageId = -1;
        NotificationManager manager;
        public override void OnReceive(Context context, Intent intent)
        {
            PendingIntent pendingIntent = PendingIntent.GetActivity(AndroidApp.Context, pendingIntentId, intent, PendingIntentFlags.OneShot);

            NotificationCompat.Builder builder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
               .SetContentIntent(pendingIntent)
               .SetContentTitle(title)
               .SetContentText(message)
               .SetLargeIcon(BitmapFactory.DecodeResource(AndroidApp.Context.Resources, Resource.Drawable.OlympiaLogo))
               .SetSmallIcon(Resource.Drawable.OlympiaLogo)
               .SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate);

            manager = (NotificationManager)context.GetSystemService(AndroidApp.NotificationService);
            var notification = builder.Build();
            manager.Notify(messageId, notification);
        }
    }

最后是我的 MainActivity.cs（当我点击通知时不会被执行的那个）：

[Activity(Label = "LocalNotificationsApp", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, LaunchMode = LaunchMode.SingleTop)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {

    protected override void OnCreate(Bundle savedInstanceState)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        CrossCurrentActivity.Current.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        CreateNotificationFromIntent(Intent);

        LoadApplication(new App());
        //
        //AndroidNotificationManager.alarmManager = (AlarmManager)GetSystemService(Context.AlarmService);
    }
    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    protected override void OnNewIntent(Intent intent)
    {
        CreateNotificationFromIntent(intent);
    }

    void CreateNotificationFromIntent(Intent intent)
    {
        if (intent?.Extras != null)
        {
            string title = intent.Extras.GetString(AndroidNotificationManager.TitleKey);
            string message = intent.Extras.GetString(AndroidNotificationManager.MessageKey);
            if(title != null && message != null)
                DependencyService.Get<INotificationManager>().ReceiveNotification(title, message);
        }
    }
}

Answer 1

尝试创建一个全新的意图并使用主活动，而不是重用传递给OnReceived的活动

[BroadcastReceiver(Enabled =true)]
public class NotificationReciever : BroadcastReceiver
{
    const string channelId = "default";
    public static string title = "";
    public static string message = "";
    const string channelName = "Default";
    const string channelDescription = "The default channel for notifications.";
    const int pendingIntentId = 0;

    public const string TitleKey = "title";
    public const string MessageKey = "message";

    int messageId = -1;
    NotificationManager manager;
    public override void OnReceive(Context context, Intent intent)
    {
        // pull stuff from old intent.
        string title = intent.Extras.GetString(TitleKey);
        string message = intent.Extras.GetString(MessageKey);

        // Instead of using intent that is passed in. Create a new one.
        Intent mainIntent = new Intent(AndroidApp.Context, typeof(MainActivity));
        var bundle = new Bundle();
        bundle.PutString(TitleKey, title);
        bundle.PutString(MessageKey, message);
        mainIntent.PutExtras(bundle);
        mainIntent.AddFlags(ActivityFlags.ClearTop);

        PendingIntent pendingIntent = PendingIntent.GetActivity(AndroidApp.Context, pendingIntentId, intent, PendingIntentFlags.UpdateCurrent);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
            .SetContentIntent(pendingIntent)
            .SetContentTitle(title)
            .SetContentText(message)
            .SetLargeIcon(BitmapFactory.DecodeResource(AndroidApp.Context.Resources, Resource.Drawable.OlympiaLogo))
            .SetSmallIcon(Resource.Drawable.OlympiaLogo)
            .SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate);

        manager = (NotificationManager)context.GetSystemService(AndroidApp.NotificationService);
        var notification = builder.Build();
        manager.Notify(messageId, notification);
    }
}