Android Question Bluetooth-connection-problem "java.io.IOException"

Deleted member 103 · Oct 22, 2018

Hello,

with the first Bluetooth connection I store the MAC address in the settings, so that with the next connection, the connection goes faster.
In the Google Report but always this error comes, and I do not understand why, or I find in my code no errors.

Here is my code:

B4X:

Sub Admin_DiscoveryFinished
    CallSub3(Main,"ShowProgressDialog","",False)
    If foundDevices.Size = 0 Then
        ToastMessageShow(Starter.language.value("strBluetoothNoFound"), True)
    Else
        Dim Macfound As NameAndMac
        Macfound.Initialize
        Macfound.Name = "" 'Sicherstellen das der Name Leer ist.
        
        Dim lst As List
        lst.Initialize
        For i = 0 To foundDevices.Size - 1
            Dim nm As NameAndMac
            nm = foundDevices.Get(i)
            lst.Add(nm.Name)
            
            If Starter.manager.GetString("BtMacAddress") = nm.Mac Then
                Macfound = nm
                Exit
            End If
        Next
        If Macfound.Name <> "" Then
            ConnectToKnownDevice(Macfound)
        Else
            'If lst.Size > 0 Then CallSub2(Main,"ChooseDevice", lst)
            CallSub2(Main,"ChooseDevice", lst)
        End If
    End If
End Sub

Sub ConnectToKnownDevice(BtMac As NameAndMac)
    connectedDevice = BtMac
    CallSub3(Main,"ShowProgressDialog",Starter.language.value("strBluetoothConnect") & " " & BtMac.Name & " (" & BtMac.Mac & ")",True)
    serial1.Connect(BtMac.Mac)
End Sub

and here the crash report:

20. Okt. 17:59 in der App-Version 97
Samsung Galaxy S5 Neo (s5neolte), Android 6.0
Bericht 1 von 1
java.io.IOException:
at android.bluetooth.BluetoothDevice.createRfcommSocketToServiceRecord (BluetoothDevice.java:1886)
at anywheresoftware.b4a.objects.Serial.Connect2 (Serial.java:147)
at anywheresoftware.b4a.objects.Serial.Connect (Serial.java:117)
at fg.cronomillemiglia.clsbluetooth._vvvvvvvvvvvvvvvvvvvvvvvvvvv5 (clsbluetooth.java:436)
at fg.cronomillemiglia.clsbluetooth._admin_discoveryfinished (clsbluetooth.java:149)
at java.lang.reflect.Method.invoke (Native Method)
at anywheresoftware.b4a.BA.raiseEvent2 (BA.java:191)
at anywheresoftware.b4a.BA.raiseEvent (BA.java:171)
at anywheresoftware.b4a.objects.Serial$BluetoothAdmin$1$1.run (Serial.java:341)
at android.os.Handler.handleCallback (Handler.java:739)
at android.os.Handler.dispatchMessage (Handler.java:95)
at android.os.Looper.loop (Looper.java:158)
at android.app.ActivityThread.main (ActivityThread.java:7230)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1120)

It would be nice if someone might find the mistake.

Erel · Oct 22, 2018

Worth adding a Try / Catch block around this call.

I know that it doesn't sound too reasonable, however are you checking that Bluetooth is enabled?

Deleted member 103 · Oct 22, 2018

Worth adding a Try / Catch block around this call.

I will try it

however are you checking that Bluetooth is enabled?

No, that did not check

Erel · Oct 23, 2018

Check that Bluetooth is enabled before you start the discovery process.

Deleted member 103 · Oct 23, 2018

Erel said:
Check that Bluetooth is enabled before you start the discovery process.

That's my code, it should work, right?

B4X:

Main:
Private Sub mnuBtButton_Click  
    bluetooth.ConnectBtButton
End Sub

BT-Class:
Public Sub ConnectBtButton
    If HasFeature("android.hardware.bluetooth") Then
        Try
            If admin.IsEnabled = False Then
                If admin.Enable = False Then
                    ToastMessageShow(Starter.language.value("strBluetoothErrorEnabling"), True)
                Else
                    ToastMessageShow(Starter.language.value("strBluetoothEnabling"), False)
                    'the StateChanged event will be soon raised
                End If
            Else           
                Admin_StateChanged(admin.STATE_ON, 0)
            End If
        Catch
            Log("ConnectBtButton-ERROR:" & LastException)
        End Try
    Else
        ToastMessageShow(Starter.language.value("strBluetoothNotPresent"), True)
    End If
End Sub

Sub Admin_StateChanged (NewState As Int, OldState As Int)
    If NewState = admin.STATE_ON Then
        ToastMessageShow(Starter.language.value("strBluetoothIsEnabled"), False)
        Searchdevice
    End If
End Sub

Sub Searchdevice
    tmpList.Clear
    foundDevices.Clear
    If admin.StartDiscovery    = False Then
        ToastMessageShow(Starter.language.value("strBluetoothErrorProcess"), True)
    Else
        CallSub3(Main,"ShowProgressDialog",Starter.language.value("strBluetoothSearch"),True)
    End If
End Sub

Erel · Oct 23, 2018

I don't see any error.

Deleted member 103 · Oct 23, 2018

Erel said:
I don't see any error.

me too.
The problem is that the customers see what.
I myself can not reproduce the mistake.

Deleted member 103 · Oct 26, 2018

After the implementation of crashlytics now these errors come.

I also changed the previous sub "ConnectToKnownDevice", unfortunately without success.

B4X:

Sub ConnectToKnownDevice(BtMac As NameAndMac)
    Try
        connectedDevice = BtMac
        CallSub3(Main,"ShowProgressDialog",Starter.language.value("strBluetoothConnect") & " " & BtMac.Name & " (" & BtMac.Mac & ")",True)
        serial1.Connect(BtMac.Mac)       
    Catch
        Log("ConnectToKnownDevice: " & LastException.Message)
    End Try
End Sub

Fatal Exception: java.io.IOException
at android.bluetooth.BluetoothDevice.createRfcommSocketToServiceRecord(BluetoothDevice.java:2294)
at anywheresoftware.b4a.objects.Serial.Connect2(Serial.java:147)
at anywheresoftware.b4a.objects.Serial.Connect(Serial.java:117)
at fg.MasterOfRegolarity.clsbluetooth._connecttoknowndevice(clsbluetooth.java:425)
at fg.MasterOfRegolarity.clsbluetooth._admin_discoveryfinished(clsbluetooth.java:146)
at java.lang.reflect.Method.invoke(Method.java)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:191)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.objects.Serial$BluetoothAdmin$1$1.run(Serial.java:341)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

Erel · Oct 26, 2018

Are you sure that this error happened after you added the Try / Catch block? It should catch IOException errors.

Deleted member 103 · Oct 26, 2018

Erel said:
Are you sure that this error happened after you added the Try / Catch block? It should catch IOException errors.

If you ask, I'm not so sure anymore, I'll wait a few more days.

Android Question Bluetooth-connection-problem "java.io.IOException"

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Similar Threads

Android Question Bluetooth-connection-problem "java.io.IOException"

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Deleted member 103

Guest

Erel

B4X founder

Deleted member 103

Guest

Similar Threads

Privacy & Transparency

Privacy & Transparency