Android Question Android System Alarm

[kpmais]

Hello folks. I need your help. I want to set up an alarm service using the Android clock/alarm.
Setting up an alarm is no problem.
But how do I clear the alarm back in code?
I did some reading in Java/Android and found a method using the AlarmManager.Cancel with the PendingIntet.
As can be seen in the code, I tried to implement this with the Reflection Library and JavaObject.
But no alarm is deleted. What am I doing wrong or what have I not understood?
And further ....
In the test code, I access the currently created intent to create a pending intent.
But how can I access an intent when accessing an already set up alarm?
Here I would have to set up the Uri or the deep link and access them.
That's my idea, but how to realize it?
I've been stuck with this problem for a week and can't get any further.
I am thankful for every help.
And if the answer comes "learn Java", then please say what exactly.
I need your help.

In the manifest i have addet the permissions:
AddPermission(com.android.alarm.permission.SET_ALARM)
AddPermission(android.permission.SCHEDULE_EXACT_ALARM)
Here my Code from a testproject

(sorry for my bad english, i'm german)

#Region  Project Attributes
    #ApplicationLabel: B4A Example
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
#End Region

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
#End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.

   
End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    Private BasePanel As Panel
    Private STCmd, StartCmd, DismissCmd,CancelCmd As Button
    Private TLabel As Label
    Private AI As Intent
End Sub

Sub Activity_Create(FirstTime As Boolean)
    CreateScreen
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Private Sub CreateScreen
    BasePanel.Initialize("basepanel")
    Activity.AddView(BasePanel,0,0,Activity.Width,Activity.Height)
    '++++++++
    STCmd.Initialize("stcmd")
    BasePanel.AddView(STCmd,5dip,5dip,100dip,40dip)
    STCmd.Text="Set Time"
    '++++++++
    TLabel.Initialize("tlabel")
    BasePanel.AddView(TLabel,5dip,50dip,100dip,40dip)
    TLabel.Color=Colors.LightGray
    TLabel.TextColor=Colors.Black
    '++++++++
    StartCmd.Initialize("startcmd")
    BasePanel.AddView(StartCmd,5dip,100dip,100dip,40dip)
    StartCmd.Text="Set Alarm"
    '++++++++
    DismissCmd.Initialize("dismisscmd")
    BasePanel.AddView(DismissCmd,StartCmd.left+StartCmd.Width+5dip,StartCmd.top,100dip,40dip)
    DismissCmd.SingleLine=True
    DismissCmd.Text="Dismiss Alarm"
    '++++++++
    CancelCmd.Initialize("cancelcmd")
    BasePanel.AddView(CancelCmd,DismissCmd.left+DismissCmd.Width+5dip,DismissCmd.top,100dip,40dip)
    CancelCmd.SingleLine=True
    CancelCmd.Text="Cancel Alarm"


End Sub

private Sub StartAlarm(hour As Int, minutes As Int,text As String)

    Dim AlarmIntent As Intent
    Dim arDays() As Int = Array As Int(1,2,3,4,5,6,7)
   
    AlarmIntent.Initialize("android.intent.action.SET_ALARM","")
'Here I would have to set the Uri/Deeplink to select a specific alarm. But I have no idea how to do that.
    AI=AlarmIntent ' Current alarm Is noted And can Then be used For testing in "CancelAlarm".
    AlarmIntent.PutExtra("android.intent.extra.alarm.HOUR", hour)
    AlarmIntent.PutExtra("android.intent.extra.alarm.MINUTES", minutes)
    AlarmIntent.PutExtra("android.intent.extra.alarm.MESSAGE",text)
    AlarmIntent.PutExtra("android.intent.extra.alarm.SKIP_UI", True)
    AlarmIntent.PutExtra("android.intent.extra.alarm.DAYS", arDays)
    AlarmIntent.PutExtra("android.intent.extra.alarm.RINGTONE","sound.wav")

    StartActivity(AlarmIntent)

End Sub

Private Sub DismissAlarm
    Dim AlarmIntent As Intent
    AlarmIntent.Initialize("android.intent.action.DISMISS_ALARM","")
    StartActivity(AlarmIntent)
End Sub

Private Sub CancelAlarm
    Dim rf As Reflector
    Dim AlarmManager,PendingIntent,Context As JavaObject
   
    Context=rf.GetContext
    AlarmManager.InitializeStatic("android.app.AlarmManager") ' = New AlarmManager
    AlarmManager=Context.RunMethod("getSystemService",Array As Object("alarm")) ' Calling AlarmServie
    Log(AlarmManager)
   
    PendingIntent.InitializeStatic("android.app.PendingIntent") ' = New PendingIntent
    Log(PendingIntent) ' PendingIntent-Class create
    Dim Args(4) As Object = Array As Object(Context,0,AI,134217728) ' Number => PendingIntent-Parameter/FLAG_UPDATE_CURRENT
'    Dim Types(4) As String = Array As String("android.content.Context","java.lang.Integer","android.content.Intent","java.lang.Integer")
    PendingIntent=PendingIntent.RunMethod("getBroadcast",Args) ' Casting PendingIntent Class to PendingIntent Object
    Log(PendingIntent) ' PendingIntent-Object Create
    AlarmManager.RunMethod("cancel",Array As Object(PendingIntent))
   
End Sub

Sub startcmd_Click
    Dim Time() As String=Regex.Split(":",TLabel.Text)
    StartAlarm(Time(0),Time(1),"TestAlarm")
End Sub

Sub cancelcmd_click
    CancelAlarm
End Sub

Sub dismisscmd_click
    DismissAlarm
End Sub

Sub stcmd_click
    Dim td As TimeDialog
    Dim Time As String
    Dim Hour, Minutes As String
    td.Is24Hours=True
    td.Show("Select Alarm Time", "", "Ok", "Cancel", "", Null)
    If td.Hour < 10 Then Hour="0" & td.Hour Else  Hour=td.Hour
    If td.Minute < 10 Then Minutes = "0" & td.Minute Else Minutes=td.Minute
    Time=Hour & ":" & Minutes
    TLabel.Text=Time
End Sub

Here a Java Code Example for cancel a alarm.

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class Main {

  public static void cancel(Context context, Intent intent) {
    AlarmManager alarme = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    PendingIntent p = PendingIntent.getBroadcast(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    alarme.cancel(p);//ww  w .j  a  va 2s  .  c  o m
  }

}

 

[Computersmith64]

You have to create an Intent that matches the intent you originally used to create the alarm. I use the type field of the Intent to create a reference that I can use when I need to cancel it. Technically the type field is supposed to be used to specify the MIME data type of the Intent, but using it the way I do works for my purposes. Here's some Kotlin code I use in one of my apps to cancel alarms:

private fun cancelAlarm(alertRef: Int, alertType: String, context: Context) {
    val flags = if (Build.VERSION.SDK_INT > 23) {
        PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
    } else {
        PendingIntent.FLAG_UPDATE_CURRENT
    }
    val intent = Intent(context.applicationContext, AlarmReceiver::class.java).apply {
        action = context.getString(R.string.action_mypets_reminder)
        type = "$alertRef-$alertType"
    }
    val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as? AlarmManager
    val alarmIntent = PendingIntent.getBroadcast(context, 0, intent, flags)
    alarmManager?.cancel(alarmIntent)

}

- Colin.