应用程序启动与否时发出通知铃声（Xamarin.Forms）
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【中文标题】应用程序启动与否时发出通知铃声（Xamarin.Forms）【英文标题】：Make a notification ring when App launched or not (Xamarin.Forms) 【发布时间】：2017-10-28 09:28:42 【问题描述】：我正在使用 依赖服务 DependencyService.Get<ISetAlarm>().SetAlarm(hour,min,"Diabetics App","Hello i remind you to take medicine");，它连接到我的 AlarmReceiver 和 AlarmImplementation 类，
问题是：
当我以任何形式放置 依赖服务 代码时，通知 只有当我启动该表单时，当我输入
onStart,onSleep时才会出现 通知仅在这种状态下出现的方法，我该怎么做 发出通知的应用程序就像一个真正的警报，当它是 启动与否？
另外：
AlarmReceiver 类
using System;
using android.App;
using Android.Content;
using Android.Media;
using Android.Support.V4.App;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using Android.Widget;
using Diabetes.localDB;
using Xamarin.Forms;
namespace Diabetes.Droid
[BroadcastReceiver]
[IntentFilter(new string[] "android.intent.action.BOOT_COMPLETED" , Priority = (int)IntentFilterPriority.LowPriority)]
public class AlarmReceiver : BroadcastReceiver
public override void OnReceive(Context context, Intent intent)
if (intent.Action.Equals("android.intent.action.BOOT_COMPLETED"))
var message = intent.GetStringExtra("message");
var title = intent.GetStringExtra("title");
//Show toast here
//Toast.MakeText(context, "Hello it's me ", ToastLength.Short).Show();
var extras = intent.Extras;
if (extras != null && !extras.IsEmpty)
NotificationManager manager_ = context.GetSystemService(Context.NotificationService) as NotificationManager;
var notificationId = extras.GetInt("NotificationIdKey", -1);
if (notificationId != -1)
manager_.Cancel(notificationId);
//Create intent for action 1 (TAKE)
var actionIntent1 = new Intent();
actionIntent1.SetAction("ARCHIVE");
var pIntent1 = PendingIntent.GetBroadcast(context, 0, actionIntent1, PendingIntentFlags.CancelCurrent);
//Create intent for action 2 (REPLY)
var actionIntent2 = new Intent();
actionIntent2.SetAction("REPLY");
var pIntent2 = PendingIntent.GetBroadcast(context, 0, actionIntent2, PendingIntentFlags.CancelCurrent);
Intent resultIntent = context.PackageManager.GetLaunchIntentForPackage(context.PackageName);
var contentIntent = PendingIntent.GetActivity(context, 0, resultIntent, PendingIntentFlags.CancelCurrent);
var pending = PendingIntent.GetActivity(context, 0,
resultIntent,
PendingIntentFlags.CancelCurrent);
//seting an alarm
MedicationDatabase db = new MedicationDatabase();
var alarm_list = db.GetAlarmList();
//Debug.WriteLine(" Time -- : "+ m.ToString());
// Instantiate the Big Text style:
Notification.BigTextStyle textStyle = new Notification.BigTextStyle();
var builder =
new Notification.Builder(context)
.AddAction(Resource.Drawable.tick_notify, "ARCHIVE", pIntent1)
.AddAction(Resource.Drawable.cancel_notify, "REPLY", pIntent2)
.SetSmallIcon(Resource.Drawable.ic_launcher)
.SetContentTitle("Diabetics Reminder")
.SetDefaults(NotificationDefaults.Sound)
.SetStyle(new Notification
.BigTextStyle()
.SetSummaryText("")
.SetBigContentTitle(title)
.BigText(message)
).SetDefaults(NotificationDefaults.All);
builder.SetContentIntent(pending);
var notification = builder.Build();
var manager = NotificationManager.FromContext(context);
manager.Notify(10010, notification);
[BroadcastReceiver]
[IntentFilter(new string[] "ARCHIVE", "REPLY" )]
public class CustomActionReceiver : BroadcastReceiver
public override void OnReceive(Context context, Intent intent)
switch (intent.Action)
case "ARCHIVE":
try
MedicationDatabase db = new MedicationDatabase();
db.addtracktaken("true");
Toast.MakeText(context, "DOSAGE TAKEN", ToastLength.Short).Show();
catch (Exception e)
Debug.WriteLine(e.StackTrace);
break;
case "REPLY":
try
Toast.MakeText(context, "ARCHIVE", ToastLength.Short).Show();
MedicationDatabase db = new MedicationDatabase();
db.addtrackmissed("true");
Toast.MakeText(context, "DOSAGE MISSED", ToastLength.Short).Show();
catch (Exception e)
Debug.WriteLine(e.StackTrace);
break;
var extras = intent.Extras;
if (extras != null && !extras.IsEmpty)
NotificationManager manager = context.GetSystemService(Context.NotificationService) as NotificationManager;
var notificationId = extras.GetInt("NotificationIdKey", -1);
if (notificationId != -1)
manager.Cancel(notificationId);
AlarmImplementation 类
[assembly: Xamarin.Forms.Dependency(typeof(SetAlarmImplementation))]
namespace Diabetes.Droid
public class SetAlarmImplementation : ISetAlarm
public void SetAlarm(int hour, int minute, string title, string message, string)
MedicationDatabase db = new MedicationDatabase();
var alarm_list = db.GetAlarmList();
//Debug.WriteLine(" Time -- : "+ m.ToString());
Intent myintent = new Intent(Xamarin.Forms.Forms.Context, typeof(AlarmReceiver));
myintent.PutExtra("message", message);
myintent.PutExtra("title", title);
PendingIntent pendingintent = PendingIntent.GetBroadcast(Xamarin.Forms.Forms.Context, 0, myintent, PendingIntentFlags.UpdateCurrent);
Java.Util.Date date = new Java.Util.Date();
Java.Util.Calendar cal = Java.Util.Calendar.Instance;
cal.TimeInMillis = Java.Lang.JavaSystem.CurrentTimeMillis();
cal.Set(Java.Util.CalendarField.HourOfDay, hour);
cal.Set(Java.Util.CalendarField.Minute, minute);
cal.Set(Java.Util.CalendarField.Second, 0);
// PendingIntent pendingIntent = PendingIntent.GetBroadcast(this, 0, alarmIntent, PendingIntentFlags.UpdateCurrent);
AlarmManager alarmManager = Xamarin.Forms.Forms.Context.GetSystemService(Android.Content.Context.AlarmService) as AlarmManager;
alarmManager.Set(AlarmType.RtcWakeup, cal.TimeInMillis, pendingintent);
编辑：
这是我的新更新
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Diabetes.localDB;
using Diabetes.Main;
namespace Diabetes.Droid
[Activity(Label = "MainApplication")]
public class MainApplication : Activity
ISetAlarm alarmService;
MedicationDatabase db = new MedicationDatabase();
public MainApplication()
public MainApplication(IntPtr handle, JniHandleOwnership transer) : base(handle, transer)
protected override void OnCreate(Bundle savedInstanceState)
base.OnCreate(savedInstanceState);
alarmService = new SetAlarmImplementation();
//Get list of stored time from Sqlite
var alarm_list = db.GetAlarmList();
//Debug.WriteLine(" Time -- : "+ m.ToString());
var message = "Hello Its I remind you to take insulin";
var title = "Diabetics App";
foreach (var list in alarm_list)
var hour = Int32.Parse(list.Substring(0, 2));
var minute = Int32.Parse(list.Substring(3, 2));
alarmService.SetAlarm(hour, minute, title,message);
// Create your application here
这就是我所做的，但是现在当我设置没有通知的时间时，就好像我必须以某种方式触发它。
我想已经接近答案了，我需要更多指导谢谢。
编辑 2：
查看 My Sqlite DB 类：
using System;
using System.Collections.Generic;
using System.Linq;
using SQLite.Net;
using Xamarin.Forms;
namespace Diabetes.localDB
public class MedicationDatabase
private SQLiteConnection _connection;
public MedicationDatabase()
_connection = DependencyService.Get<ISQLite>().GetConnection();
_connection.CreateTable<Medication>();
_connection.CreateTable<SetReminder>();
// _connection.CreateTable<Track>();
_connection.CreateTable<TrackMissed>();
_connection.CreateTable<TrackTaken>();
_connection.CreateTable<LoginModel>();
public void AddDetails(string username, string alarm_time, string units, string insulin_type, string unique_id, string status)
_connection.Query<Medication>("Insert into [Medication] (username, alarm_time, units,insulin_type,unique_id,status) values" +
"('" + username + "','" + alarm_time + "','" + units + "','" + insulin_type + "','" + unique_id + "','" + status + "')");
public void AddReminder(string username, string alarm_time,
string units, string insulin_type, string count_times)
_connection.Query<SetReminder>("Insert into [SetReminder] (username, alarm_time, units,insulin_type,count_times) values" +
"('" + username + "','" + alarm_time + "','" + units
+ "','" + insulin_type + "','" + count_times + "')");
public IEnumerable<Medication> AllMedicationResults()
return (from t in _connection.Table<Medication>()
select t).ToList();
public IEnumerable<SetReminder> AllReminders()
return (from t in _connection.Table<SetReminder>()
select t).ToList();
public IEnumerable<string> GetAlarmList()
return (from t in _connection.Table<Medication>()
select t.alarm_time).ToList();
/* public string AlarmSample()
return (_connection.Table<SetReminder>().Select(r => r.)
.AsEnumerable()
.Select(r => r.Substring(1, r.Length - 2).Split(','))).ToList().ToString()
; */
public IEnumerable<string> GetUnitsList()
return (from t in _connection.Table<Medication>()
select t.units).ToList();
public void DeleteAlarm()
_connection.DeleteAll<SetReminder>();
public void DeleteTime(int id)
_connection.Delete<Medication>(id);
public void DeleteAllTime()
_connection.DeleteAll<Medication>();
// Tracking table
public void addtracktaken(string taken)
_connection.Query<TrackTaken>("Insert into [TrackTaken] (taken) values" +
"('" + taken + "')");
public void addtrackmissed(string missed)
_connection.Query<TrackMissed>("Insert into [TrackMissed] (missed) values" +
"('" + missed + "')");
public int GetTracksTakenNos()
return (from t in _connection.Table<TrackTaken>()
select t.taken).Count();
public int GetTracksMissedNo()
return (from t in _connection.Table<TrackMissed>()
select t.missed).Count();
//Loging in
public void addUser(string username, string logged)
_connection.Query<LoginModel>("Insert into [LoginModel] (username,LoggedIn) values" +
"('" + username + "', '" + logged + "')");
public void DeleteUsers()
_connection.DeleteAll<LoginModel>();
public string LoggedInStatus()
List<LoginModel> list = _connection.Query<LoginModel>("Select LoggedIn From [LoginModel] where ID=1");
return list[0].LoggedIn;
public string GetUserName()
List<LoginModel> list = _connection.Query<LoginModel>("Select username From [LoginModel] where ID=1");
return list[0].username;
还有界面：
namespace Diabetes.localDB
public interface ISQLite
SQLiteConnection GetConnection();
【问题讨论】：
你试过这个插件：nuget.org/packages/Xam.Plugins.Notifier 吗？它已经为您处理了 AlarmManager 并提供了 PCL 实现。 是的@RodrigoE.，我试过了，但它错过了很多功能，这就是我最终使用依赖服务的原因 @IdrisStack 你是说当你打电话给.SetAlarm时通知会立即触发吗？
是的，我喜欢让 App 像真正的警报一样做出反应，我应该使用 onSleep、onpause 等特殊方法来实现这一点，因为我试图将它放在 App 中.cs，但是当我启动应用程序时会弹出通知，当到达预定时间时它不能弹出
它也会出现在我调用.SetAlarm的页面上
【参考方案1】：
首先，不要使用 DependencyService，因为它依赖于 Xamarin Forms 初始化，因此它只会在打开应用程序时工作。当应用程序关闭时，您不能执行任何与 Xamarin Forms 相关的调用，因为此时 MainActivity 不可用并且 Xamarin Forms 会在其上中继。
建议改为执行以下操作：
1.创建一个Android应用类
2.在那里创建警报服务的实例。
3.设置闹钟
[Application]
public class MainApplication : Application
ISetAlarm alarmService;
public MainApplication(IntPtr handle, JniHandleOwnership transer) :base(handle, transer)
public override void OnCreate()
base.OnCreate();
alarmService = new SetAlarmImplementation();
alarmService.SetAlarm(hour,min,"Diabetics App","Hello i remind you to take medicine");
【讨论】：
非常感谢@Rendy 的回复，我编辑了我的帖子，但现在我没有收到任何通知 应用程序关闭或打开时没有收到？ 顺便说一句，您修改的代码是错误的，您一直使用 Activity 来初始化警报，您刚刚将其重命名为 MainApppication。 仔细查看我的代码和你的代码，你会发现你使用 [Activity] 属性的差异我使用的是 [Application] 属性。您从 Activity 类继承，我的继承自 Application 类。 我现在对其进行了编辑，但仍在与 TargetInvocation Exception 斗争，它需要global::Xamarin.Forms.Forms.Init(this);，我正在尝试输入它，但有一些错误【参考方案2】：
在您的应用程序类的 OnCreate 方法上启动一个粘性服务，这样即使应用程序关闭，该服务也会使应用程序保持活动状态并且您仍然可以获得通知。
[Application]
public class MainApplication : Application
public static Context AppContext;
public MainApplication(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
public override void OnCreate()
base.OnCreate();
AppContext = this.ApplicationContext;
StartService();
public static void StartService()
AppContext.StartService(new Intent(AppContext, typeof(AppStickyService)));
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(AppStickyService)), 0);
AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(Context.AlarmService);
alarm.Cancel(pintent);
public static void StopService()
AppContext.StopService(new Intent(AppContext, typeof(AppStickyService)));
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(AppStickyService)), 0);
AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(Context.AlarmService);
alarm.Cancel(pintent);
创建一个粘性服务类：
[Service]
public class AppStickyService : Service
public override void OnCreate()
base.OnCreate();
System.Diagnostics.Debug.WriteLine("Sticky Service - Created");
public override StartCommandResult OnStartCommand(Android.Content.Intent intent, StartCommandFlags flags, int startId)
System.Diagnostics.Debug.WriteLine("Sticky Service - Started");
return StartCommandResult.Sticky;
public override Android.OS.IBinder OnBind(Android.Content.Intent intent)
System.Diagnostics.Debug.WriteLine("Sticky Service - Binded");
return null;
public override void OnDestroy()
System.Diagnostics.Debug.WriteLine("Sticky Service - Destroyed");
base.OnDestroy();
【讨论】：
请注意，调试时不应关闭应用程序。您可以停止应用程序，然后重新打开并再次关闭。但在调试过程中永远不要关闭它，因为 Android 不能很好地处理这种情况。 我已经试过这个代码，我首先放置alarmService.SetAlarm(hour,min,"Diabetics App","Hello i remind you to take medicine"); 然后StartService()它在设定的时间到达时崩溃了，我也以相反的方式进行，没有任何结果，我应该把所有的警报StartService()方法中的实现代码？
请接受我在 Facebook 上的好友请求 我的名字是 Lutaaya Huzaifah Idris
我不知道我会如何感谢你，但是，你的回答对我帮助很大@Rendy，你应该喝一杯 capucino以上是关于应用程序启动与否时发出通知铃声（Xamarin.Forms）的主要内容，如果未能解决你的问题，请参考以下文章