我正在尝试启动服务，以便我可以接收预定的通知，但是当预定的时间到达应用程序崩溃时（不幸的是应用程序已经停止），为什么会发生这种情况。
我遇到的挑战之一，不幸的是，我不知道如何看待例外 日志中服务。
我的舱单如下：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.diabetics.Diabetes">
<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.REBOOT" />
<application android:label="Diabetes">
<!-- Will not be called unless the application explicitly enables it -->
<service android:name="com.diabetics.Diabetes.AppStickyService">
<intent-filter>
<action android:name="com.diabetics.Diabetes.AppStickyService" />
</intent-filter>
</service>
<receiver android:name="com.diabetics.Diabetes.AlarmReceiver" android:enabled="false" android:exported="true" android:process=":remote" android:label="AlarmReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>
然后我的服务类
[Service(Exported = true, Name = "com.diabetics.Diabetes.AppStickyService")]
public class AppStickyService : Service
{
public override void OnCreate()
{
base.OnCreate();
Toast.MakeText(this, "Service started", ToastLength.Long).Show();
System.Diagnostics.Debug.WriteLine("Sticky Service - Created");
}
public override StartCommandResult OnStartCommand(Android.Content.Intent intent, StartCommandFlags flags, int startId)
{
return StartCommandResult.Sticky;
}
public override Android.OS.IBinder OnBind(Android.Content.Intent intent)
{
System.Diagnostics.Debug.WriteLine("Sticky Service - Binded");
Toast.MakeText(this, "Service started", ToastLength.Long).Show();
return null;
}
public override void OnDestroy()
{
try
{
base.OnDestroy();
}
catch (Java.Lang.IllegalStateException ex)
{
//Log.Debug("MainActivity.OnDestroy", ex, "The activity was destroyed twice");
}
cancelnotification(0);
}
}
然后如何调用StartService()中的MainApplication.cs。
[Application]
public class MainApplication : Application
{
ISetAlarm alarmService;
public static Context AppContext;
public MainApplication()
{
}
public MainApplication(IntPtr handle, JniHandleOwnership transer) : base(handle, transer)
{
}
public override void OnCreate()
{
base.OnCreate();
AppContext = this.ApplicationContext;
try
{
StartService();
alarmService = new SetAlarmImplementation();
alarmService.SetAlarm(12, 14, "hello", "great work ");
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Error " + e);
}
}
public void SetAlarm(int hour, int minute, string title, string message)
{
AppContext.StartService(new Intent(AppContext, typeof(AppStickyService)));
Intent myintent = new Intent(Android.App.Application.Context, typeof(AppStickyService));
myintent.PutExtra("message", message);
myintent.PutExtra("title", title);
//PendingIntent pendingintent = PendingIntent.GetBroadcast(Android.App.Application.Context, 0, myintent, PendingIntentFlags.UpdateCurrent);
PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(AppStickyService)), 0);
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);
AlarmManager alarmManager = Android.App.Application.Context.GetSystemService(Android.Content.Context.AlarmService) as AlarmManager;
alarmManager.Set(AlarmType.RtcWakeup, cal.TimeInMillis, pintent);
// alarmManager.Cancel(pintent);
}
public void StartService()
{
AppContext.StartService(new Intent(AppContext, typeof(AppStickyService)));
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
{
StartService(new Intent(this, typeof(AppStickyService)));
}
}
public static void StopService()
{
AppContext.StopService(new Intent(AppContext, typeof(AppStickyService)));
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
{
// Toast.MakeText(this,"Service started", ToastLength.Long).Show();
//PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(AppStickyService)), 0);
// AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(Context.AlarmService);
//alarm.Cancel(pintent);
}
}
应用程序崩溃，我不知道确切的异常，怎么可能 我完美了，请。
我的UPDATED堆栈跟踪：
11-03 18:45:03.314 27931 27931 E AndroidRuntime: FATAL EXCEPTION: main
11-03 18:45:03.314 27931 27931 E AndroidRuntime: Process: com.diabetics.Diabetes, PID: 27931
11-03 18:45:03.314 27931 27931 E AndroidRuntime: android.runtime.JavaProxyThrowable: System.InvalidOperationException: You MUST call Xamarin.Forms.Init(); prior to using it.
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Xamarin.Forms.Device.get_PlatformServices () [0x00007] in <1982f4f36e0b4e118327ea411be26e7b>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Xamarin.Forms.Device.GetAssemblies () [0x00000] in <1982f4f36e0b4e118327ea411be26e7b>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Xamarin.Forms.DependencyService.Initialize () [0x00008] in <1982f4f36e0b4e118327ea411be26e7b>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Xamarin.Forms.DependencyService.Get[T] (Xamarin.Forms.DependencyFetchTarget fetchTarget) [0x00000] in <1982f4f36e0b4e118327ea411be26e7b>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Diabetes.localDB.MedicationDatabase..ctor () [0x00008] in <1d32457e60b941eda588a8ccf582a78e>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Diabetes.Droid.AlarmReceiver.OnReceive (Android.Content.Context context, Android.Content.Intent intent) [0x000e9] in <a946f75a1e344852a2da6cb15bcf50b1>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at Android.Content.BroadcastReceiver.n_OnReceive_Landroid_content_Context_Landroid_content_Intent_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_context, System.IntPtr native_intent) [0x00017] in <d278c06ad5684d6882c743a94a93ebc2>:0
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at (wrapper dynamic-method) System.Object:6ad989d4-d363-48db-abae-68048f2d711b (intptr,intptr,intptr,intptr)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at md5d7f88582010464bb2d25fa2f1bb63590.AlarmReceiver.n_onReceive(Native Method)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at md5d7f88582010464bb2d25fa2f1bb63590.AlarmReceiver.onReceive(AlarmReceiver.java:29)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.app.ActivityThread.handleReceiver(ActivityThread.java:2910)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.app.ActivityThread.access$1800(ActivityThread.java:175)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1565)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:111)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.os.Looper.loop(Looper.java:207)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5728)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
11-03 18:45:03.314 27931 27931 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)