Android Question Killing previous instance (main) with GCM

[Luiz Fernando Orlandini]

Hi All.

I getting the error killing previous instance (main), and I don't have any idea about how to solve it.

My scenario is below:

I have my app implemented in the Main class and I have a second class called NewOrder, that is used to receive and process the notifications.

My App receives many notifications directly from GCM implementations.

When the message arrived, I create a new instance of NewOrder using, StartActivity(NewOrder).

Everythings works fine until here. But when I decide to do another tasks in the mobile phone, call somebody and even turn off the device, when I got back to the application, when it starts I receive a white screen, like if the application has lost the flow and in the log I can see the message Killing previous instance (main).

I have an option to pull the back button also, and when I do that, I came back to the correct NewOrder screen, and when I finalize the process, the application just closes.

Maybe an alternative, is put all the code of NewOrder, in the Main class, but I believe, that I can correct something in my code that will correct the behavior of my APP.

Regards.

 

[Erel]

This is not an error. It is an information message.

Can you post the code in Activity_Create?

 

[Luiz Fernando Orlandini]

Hi Erel.

Follow the code of Main class.

Sub Activity_Create(FirstTime As Boolean)
    If (FirstTime = True) Then
        Frame = 0
        TimerGif.load(File.DirAssets, "waiting.gif")
        TimerForGif.Interval = TimerGif.Delay(Frame)
        TimerForGif.Initialize("TimerForGif", TimerForGif.Interval)
        TimerForGif.Enabled = False
               
        Dim PhoneInfo As PhoneId
        If PhoneInfo.GetSimSerialNumber.Trim.Length > 0 Then
            SimCardNumber = PhoneInfo.GetSimSerialNumber
        Else If PhoneInfo.GetSubscriberId.Trim.Length > 0 Then
            SimCardNumber = PhoneInfo.GetSubscriberId
        Else If PhoneInfo.GetLine1Number.Trim.Length > 0 Then
            SimCardNumber = PhoneInfo.GetLine1Number
        Else
            SimCardNumber = PhoneInfo.GetDeviceId
        End If
       
        If (File.Exists(File.DirInternal, "PrefTaxiSP.txt") = True) Then
            ScreenToLoadWhenBack = "FirstMenu"
            Activity.LoadLayout("Login")
            loadEditLogin
           
            chkAutomaticLogin.Checked = True
            Dim Login As LoginPreferences
            Login.Initialize("", "")
            Dim m As Map = Login.GetPreferences
            edtPhoneNumber.Text = m.GetKeyAt(0)
            edtPassword.Text = m.GetValueAt(0)
        Else
            Activity.LoadLayout("FirstMenu")           
        End If

        UserLogged = False
        UserAvailable = False
               
        MyFade.Initialize(Activity, Me, "powered-splash.png", Gravity.CENTER_VERTICAL, 5000, 1000, "Fade", False)
    Else
        If StateManager.RestoreState(Activity, "Main", 60) = False Then
            'set the default values
            If (UserLogged = False AND ScreenToLoadWhenBack <> "FirstMenu") Then
                ScreenToLoadWhenBack = "FirstMenu"
                Activity.Invalidate
                Activity.RemoveAllViews
                Activity.LoadLayout("Login")
                loadEditLogin

                If (File.Exists(File.DirInternal, "PrefTaxiSP.txt") = True) Then
                    chkAutomaticLogin.Checked = True
                    Dim Login As LoginPreferences
                    Login.Initialize("", "")
                    Dim m As Map = Login.GetPreferences
                    edtPhoneNumber.Text = m.GetKeyAt(0)
                    edtPassword.Text = m.GetValueAt(0)
                End If
            Else
                If (ScreenToLoadWhenBack <> "NewOrder" OR _
                    ScreenToLoadWhenBack <> "OrderAccepted" OR _
                    ScreenToLoadWhenBack <> "FinalizeOrder" OR _
                    ScreenToLoadWhenBack <> "WaitingCustomer") Then
                   
                    Activity.Invalidate
                    Activity.RemoveAllViews
                End If
               
                If (Activity.RequestFocus = False) Then
                    Activity.LoadLayout(ScreenToLoadWhenBack)
                End If
            End If
        End If   
    End If
End Sub

From NewOrder class.

Sub Activity_Create(FirstTime As Boolean)   
    If (FirstTime = True) Then
        Frame = 0
        TimerGif.Load(File.DirAssets, "waiting.gif")
        TimerForGif.Interval = TimerGif.Delay(Frame)
   
        If (TimerForGif.IsInitialized = False) Then
            TimerForGif.Initialize("TimerForGif", TimerForGif.Interval)
        End If
    End If
End Sub

 

[Luiz Fernando Orlandini]

One more relevant information.

When I receive the GCM message in the Service Module it is executed...

Sub MessageArrived (Intent As Intent)
    Log("New notification arrived")

    If (Main.UserAvailable = True) Then    
        StartActivity(NewOrder)
            
        CallSubDelayed2(NewOrder, "NewNotificationArrived", Intent)
    Else
        Log("Inactive user in system")
    End If
End Sub

 

[Erel]

I don't completely understand the code above. However you should make sure that the layout is always loaded in Activity_Create. Even if FirstTime is False.

 

[Luiz Fernando Orlandini]

I don't completely understand the code above. However you should make sure that the layout is always loaded in Activity_Create. Even if FirstTime is False.

Well, maybe the problem could be in the StateManager... I will look if any improvement could be done.

Thanks.

 

[Luiz Fernando Orlandini]

I don't completely understand the code above. However you should make sure that the layout is always loaded in Activity_Create. Even if FirstTime is False.

Erel, but why the Main class has be killed? Once the class was killed, any code of Main Activity_Create will be executed, Am I rigth?

 

[Erel]

This is how Android works. The OS can kill the activity and recreate it. In some cases a second instance of the activity is created. In these cases B4A kills the first instance.

 

[Luiz Fernando Orlandini]

I resolved this behavior using Service.StartForegroud
It was necessary to join my two activities in just one, cause the notification was direction to the wrong one.