Question

我希望在Xamarin Forms中使用C＃创建一个基于文本的Android游戏。

在故事中，我想设置角色任务，这将花费他们一些时间，例如“我会挖掘这个洞，当我完成时，我会给你一个嗡嗡声。”

如何设置在设定时间后显示的通知？例如，上述声明可能需要10分钟，然后用户会收到继续游戏的通知吗？

我一周前才开始使用C＃，所以如果这是noobish，或者已经被问过，我会道歉。我到处都看，但有几种类型的通知，当我试图理解它时，似乎我正在读法语。

Answer 1

我首先要在PCL项目中创建2个接口：

$txt = $str.PHP_EOL;

然后，在Android Project中，创建实现：

警报助手

public interface IAlarm {
    void SetAlarm();
}

public interface INotification {
    void Notify(LocalNotification notification);
}

通知助手

[assembly: Dependency(typeof(AlarmHelper))]
namespace Test.Droid
{
    class AlarmHelper: IAlarm
    {
        public void SetAlarm(int minutes)
        {
            var alarmTime = Calendar.Instance;
            alarmTime.Add(CalendarField.Minute, minutes);

            var intent = new Intent(Android.App.Application.Context, typeof(ScheduledAlarmHandler));
            var pendingIntent = PendingIntent.GetBroadcast(Android.App.Application.Context, 0, intent, PendingIntentFlags.CancelCurrent);
            var alarmManager = Android.App.Application.Context.GetSystemService(Context.AlarmService) as AlarmManager;

            alarmManager.Set(AlarmType.RtcWakeup, alarmTime.TimeInMillis, pendingIntent); 
        }
    }
}

等待时间结束后，将调用[assembly: Dependency(typeof(NotificationHelper))] namespace Test.Droid { class NotificationHelper : INotification { public void Notify (string title, string text) { NotificationManager notificationManager = (NotificationManager) Android.App.Application.Context.GetSystemService(Context.NotificationService); Intent intent = new Intent(Android.App.Application.Context, typeof(MainActivity)); PendingIntent pIntent = PendingIntent.GetActivity(Android.App.Application.Context, 0, intent, PendingIntentFlags.OneShot); Notification nativeNotification = new Notification(); var builder = new NotificationCompat.Builder(Android.App.Application.Context) .SetContentTitle(title) .SetContentText(text) .SetSmallIcon(Resource.Drawable.ic_notif) // 24x24 dp .SetLargeIcon(BitmapFactory.DecodeResource(Android.App.Application.Context.Resources, Android.App.Application.Context.ApplicationInfo.Icon)) .SetPriority((int)NotificationPriority.Default) .SetAutoCancel(true) .SetContentIntent(pIntent); notificationManager.Notify(0, builder.Build()); // Id 0 can be random } } }：

BroadCastReceiver

在PCL项目游戏逻辑中，您可以按如下方式设置新警报：

[BroadcastReceiver]
class ScheduledAlarmHandler : WakefulBroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        // Implement quick checking logic here if notification is still required, plus its tittle and text
        // you have 10 seconds max in this method and cannot use 'await'

        var notificationHelper = new NotificationHelper();
        notificationHelper.Notify("Title","Text");
    }
}

我故意将闹钟和闹钟分开。通知逻辑，使您能够在10分钟后检查是否仍应显示通知并设置其标题和文本。另一种方法是在使用alarmHelper = DependencyService.Get<IAlarm>(); alarmSetter.SetAlarm(10); // 10 minutes from now设置闹钟时传递标题和文字。

Answer 2

将此行添加到您的AndroidManifest.xml

<uses-permission android:name="android.permission.WAKE_LOCK" />

在您的android项目中实现BroadcastReceiver

[BroadcastReceiver]
public class NotificationBroadcastReceiver : BroadcastReceiver
{
  private ApprovalDataStore _approvalDataStore => DependencyService.Get<ApprovalDataStore>();

  public override async void OnReceive(Context context, Intent intent)
  {
     var pm = PowerManager.FromContext(context);
     var wakeLock = pm.NewWakeLock(WakeLockFlags.Partial, "GCM Broadcast Reciever Tag");
     wakeLock.Acquire();

     //Write your code here

     // When you are finished
     wakeLock.Release();
  }
}

关闭应用时推送通知

2 个答案: