Android Code Snippet InterApp communication to "Easy Barcode Scanner"


I recently found an barcode scanner app which can easily be "communicated" with any custom app.
Since I am developing warehouse apps in which it must process products' barcodes, I thus make use of this barcode scanner app to get the barcode string.

libraries used: JavaObject, Phone and Audio

The code snippet is quite straight-forward:
interapp with barcode scanner:
#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.
    'These variables can only be accessed from this module.
    Private Button1 As Button
    Private label1 As Label
    Private ion As Object
    Private lst As List
    Private beep As Beeper
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    beep.Initialize(300, 1000)
    If Button1.IsInitialized = False Then
        Activity.AddView(Button1, 10dip,10dip,100dip,100dip)
        Button1.Text = "Click"
    End If
    If label1.IsInitialized = False Then
        Activity.AddView(label1, 10dip,120dip, 90%x, 90%y - 120dip)
        label1.SingleLine = False
        label1.TextSize = 20
        label1.TextColor = Colors.Black
        label1.Text = ""      
    End If
    If lst.IsInitialized = False Then
    End If
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub Button1_Click  
    Dim isappfound As Boolean = isPackageInstalled("org.magiclen.barcodescanner")
    If isappfound = False Then
        MsgboxAsync("please install Easy Barcode Scanner first!", "No barcode app found")
    End If  
End Sub

Sub ShowPicker
    Dim i As Intent
    i.Initialize("org.magiclen.barcodescanner.SCAN", "")
    i.PutExtra("SCAN_MODE", "SCAN_MODE")
End Sub

Sub ion_Event (MethodName As String, Args() As Object) As Object
    If -1 = Args(0) Then 'resultCode = RESULT_OK
        Dim i As Intent = Args(1)
        Dim resulttext As String = i.GetExtra("SCAN_RESULT")
        Dim resulttype As String = i.GetExtra("code_type")
'        Dim jo As JavaObject = i
'        Dim uri As String = jo.RunMethod("getParcelableExtra", _
'               Array As Object("android.intent.extra.ringtone.PICKED_URI"))
        LogColor("scanned text: "&resulttext, Colors.Blue)      
        LogColor("scanned type: " &resulttype, Colors.Magenta)
        lst.Add(resulttext & " : " & resulttype)
        If label1.Text = "" Then          
            label1.Text = $"${lst.Size}. ${resulttext}:${resulttype}"$
            label1.Text = label1.Text & CRLF & $"${lst.Size}. ${resulttext}:${resulttype}"$
        End If      
    End If
    Return Null
End Sub

Sub StartActivityForResult(i As Intent)
    Dim jo As JavaObject = GetBA
    ion = jo.CreateEvent("anywheresoftware.b4a.IOnActivityResult", "ion", Null)
    jo.RunMethod("startActivityForResult", Array As Object(ion, i))
End Sub

Sub GetBA As Object
    'Dim jo As JavaObject = Me
    'Return jo.RunMethod("getBA", Null)
    Dim jo As JavaObject
    Dim cls As String = Me
    cls = cls.SubString("class ".Length)
    Return jo.GetField("processBA")
End Sub

Public Sub isPackageInstalled(packagename As String) As Boolean
    Dim isFound As Boolean = False
    Dim pm As PackageManager
    Dim packages As List
    packages = pm.GetInstalledPackages
    For i = 0 To packages.Size - 1
        If packages.Get(i) = packagename Then
            Log("Good! Package: " & packages.Get(i) & " is found!")
            isFound = True
        End If
    Return isFound
End Sub

App download link:
App source code: