我有一個(gè)方法，可以在每個(gè) TimeSpan 間隔向用戶發(fā)送一次本地通知：public async void GetVehiclePositionRepeatAsync(TimeSpan interval, CancellationToken cancellationToken) { while (true) { var task = new Task(() => { cancellationToken.ThrowIfCancellationRequested(); var not = new PushNotificationGenerator(this, "Hooray!", "yay", "STOP_NOTIFICATIONS"); not.Push(); }); task.Start(); await Task.Delay(interval, cancellationToken); } }我的目標(biāo)是在通知上有兩個(gè)選項(xiàng)；將消除當(dāng)前通知，但允許此任務(wù)繼續(xù)運(yùn)行。對(duì)方會(huì)取消這個(gè)任務(wù)。這是 PushNotificationGenerator 類：public class PushNotificationGenerator{ public MapActivity Activity { get; set; } public string Title { get; set; } public string Text { get; set; } public string ChannelId { get; set; } public PushNotificationGenerator(MapActivity act, string title, string txt, string channelId) { Activity = act; Title = title; Text = txt; ChannelId = channelId; } public void Push() { var resultIntent = new Intent(); resultIntent.SetAction("Dismiss"); var stackBuilder = TaskStackBuilder.Create(Activity); stackBuilder.AddParentStack(Class.FromType(typeof(MapActivity))); stackBuilder.AddNextIntent(resultIntent); var resultPendingIntent = stackBuilder.GetPendingIntent(0, (int)PendingIntentFlags.UpdateCurrent); var builder = new NotificationCompat.Builder(Activity, ChannelId) .SetAutoCancel(true) .SetContentTitle(Title) .SetSmallIcon(Resource.Drawable.stop_bus) .SetContentText(Text) .AddAction(0, "Dont Dismiss", resultPendingIntent) .AddAction(0, "Dismiss", resultPendingIntent); var notificationManager = NotificationManagerCompat.From(Activity); notificationManager.Notify(41144, builder.Build()); }}我不知道如何使用通知中的 CancellationToken 。
1 回答
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TA貢獻(xiàn)1805條經(jīng)驗(yàn) 獲得超9個(gè)贊
首先在你的Push方法中：
public void Push()
{
...
Intent intentDismiss = new Intent(this, typeof(NotivicationBroadCast));
intentDismiss.SetAction("notification_dismiss");
PendingIntent pendingIntentDismiss = PendingIntent.GetBroadcast(this, 0,
intentDismiss, PendingIntentFlags.UpdateCurrent);
Intent intentCancel = new Intent(this, typeof(NotivicationBroadCast));
intentCancel.SetAction("notification_cancel");
PendingIntent pendingIntentCancel = PendingIntent.GetBroadcast(this, 0,
intentCancel, PendingIntentFlags.UpdateCurrent);
var builder = new NotificationCompat.Builder(Activity, ChannelId)
.SetAutoCancel(true)
.SetContentTitle(Title)
.SetSmallIcon(Resource.Drawable.stop_bus)
.SetContentText(Text)
.AddAction(0, "Dont Dismiss", pendingIntentDismiss)
.AddAction(0, "Dismiss", pendingIntentCancel );
var notificationManager = NotificationManagerCompat.From(Activity);
notificationManager.Notify(41144, builder.Build());
}
在GetVehiclePositionRepeatAsync方法中：
public async void GetVehiclePositionRepeatAsync(TimeSpan interval, CancellationToken cancellationToken)
{
while (!cancellationToken.IsCancellationRequested) {
var task = new Task(() =>
{
cancellationToken.Token.ThrowIfCancellationRequested();
var not = new PushNotificationGenerator(this, "Hooray!", "yay", "STOP_NOTIFICATIONS");
not.Push();
},cancellationToken.Token);
task.Start();
await Task.Delay(interval);
}
}
}
然后自定義NotivicationBroadCast：
[BroadcastReceiver]
class NotivicationBroadCast : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
string action = intent.Action;
if (action.Equals("notification_dismiss"))
{
NotificationManager notificationManager = (NotificationManager)context.GetSystemService(Context.NotificationService);
notificationManager.Cancel(notificationId);
}
if (action.Equals("notification_cancel"))
{
cancellationToken.Cancel();
}
}
}
不要忘記在活動(dòng)中注冊(cè)接收器：
protected override void OnResume()
{
base.OnResume();
NotivicationBroadCast recieve = new NotivicationBroadCast();
IntentFilter intentFilter = new IntentFilter();
intentFilter.AddAction("notification_dismiss");
intentFilter.AddAction("notification_cancel");
RegisterReceiver(recieve, intentFilter);
begin();
}
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