Android Code Snippet Version safe notification

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Update: If you are using B4A v8.0+ then the standard notifications will work.
Make sure to call Notification.SetInfo as the last step before using the notification.

New class for more powerful notifications: NB6 - Notifications Builder class (2018)

<code deleted as it is no longer relevant>
 
Last edited:

NJDude

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I'm testing the code on a device running Android Oreo (8.0.0 - SDK 26) and I get this error:
B4X:
** Activity (main) Create, isFirst = true **
main_createnotification (java line: 409)
java.lang.RuntimeException: Method: setChannelId not found in: android.support.v4.app.NotificationCompat$Builder
	at anywheresoftware.b4j.object.JavaObject$MethodCache.getMethod(JavaObject.java:366)
	at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:119)
	at njdude.generic.sample.main._createnotification(main.java:409)
	at njdude.generic.sample.main._activity_create(main.java:333)
	at java.lang.reflect.Method.invoke(Native Method)
	at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
	at njdude.generic.sample.main.afterFirstLayout(main.java:102)
	at njdude.generic.sample.main.access$000(main.java:17)
	at njdude.generic.sample.main$WaitForLayout.run(main.java:80)
	at android.os.Handler.handleCallback(Handler.java:789)
	at android.os.Handler.dispatchMessage(Handler.java:98)
	at android.os.Looper.loop(Looper.java:164)
	at android.app.ActivityThread.main(ActivityThread.java:6541)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
java.lang.RuntimeException: Method: setChannelId not found in: android.support.v4.app.NotificationCompat$Builder
Am I missing something?
 

Peter Simpson

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@NJDude I'm using the following code which I believe works perfect for me, please give it a go and let me know your results.
B4X:
    Dim NotificationInfo As NotificationBuilder
           NotificationInfo.Initialize
           NotificationInfo.SmallIcon = "icon"
           NotificationInfo.setActivity(Main)
           NotificationInfo.ContentTitle = "App Info"
           NotificationInfo.ContentText = "NotificationMessage"
           NotificationInfo.DefaultSound = True
           NotificationInfo.DefaultLight = True
           NotificationInfo.DefaultVibrate = True
           'NotificationInfo.setProgress(100, 75, False)
 
    Dim P As Phone
    If P.SdkVersion >= 26 Then
        Dim Ctxt As JavaObject
            Ctxt.InitializeContext
 
        Dim Manager As JavaObject
            Manager.InitializeStatic("android.app.NotificationManager")
        Dim Channel As JavaObject
 
        Dim ChannelVisibleName As String = "My Channel"
        Channel.InitializeNewInstance("android.app.NotificationChannel", Array("MyChannelId1", ChannelVisibleName, Manager.GetField("IMPORTANCE_DEFAULT")))
        Manager = Ctxt.RunMethod("getSystemService", Array("notification"))
        Manager.RunMethod("createNotificationChannel", Array(Channel))
 
        Dim Jo As JavaObject = NotificationInfo
            Jo.RunMethod("setChannelId", Array("MyChannelId1"))
    End If

    NotificationInfo.Notify(1)
 
Last edited:

martin24

Member
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The "Sound" parameter doesn't work correctly with your code.

Seems that you cannot change the importance once a channel is created. See also https://stackoverflow.com/questions/45919392/disable-sound-from-notificationchannel

I tried the following work around which seems to work (not tested with Vibrate):

B4X:
Dim sChannelName As String
If Sound Then
    sChannelName = "MyChannelId1"
Else
    sChannelName = "MyChannelId2"
End If

Dim ctxt As JavaObject
ctxt.InitializeContext
Dim manager As JavaObject
manager.InitializeStatic("android.app.NotificationManager")
Dim Channel As JavaObject
Dim importance As String
If Sound Then importance = "IMPORTANCE_DEFAULT" Else importance = "IMPORTANCE_LOW"
Dim ChannelVisibleName As String = Application.LabelName
Channel.InitializeNewInstance("android.app.NotificationChannel", Array(sChannelName, ChannelVisibleName, manager.GetField(importance)))
manager = ctxt.RunMethod("getSystemService", Array("notification"))
manager.RunMethod("createNotificationChannel", Array(Channel))
Dim jo As JavaObject = nb
jo.RunMethod("setChannelId", Array(sChannelName))
 

Johan Hormaza

Well-Known Member
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My notification icon goes like this. What would be the problem
 

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Semen Matusovskiy

Well-Known Member
Licensed User
I got java.lang.RuntimeException: Method: setChannelId not found in: android.support.v4.app.NotificationCompat$Builder

Android Oreo 8.0.0
... \platforms\android-27\android.jar
I installed all in B4A and Android Studio SDK manager

What can be wrong ? BTW, I don't understand how setChannelId (API 26.0.1) is able to work in Oreo 8.0.0
 
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