[VB开发安卓]B4A 二维码,条形码,PDF417码识别和创建,界面仿微信早期版本扫一扫

#Region  Project Attributes 
  #ApplicationLabel: OhhZxing扫码示例
  #VersionCode: 1
  #VersionName: 一线编程
  #SupportedOrientations: portrait
  #CanInstallToExternalStorage: False
#End Region
#Region  Activity Attributes 
  #FullScreen: False
  #IncludeTitle: True
#End Region

Sub Process_Globals
  Private rp As RuntimePermissions ''权限控制
End Sub

Sub Globals
  Private Button1 As Button
  Private Button2 As Button
  Private Button3 As Button
  Private Button4 As Button
  Private EditText1 As EditText
  Private ImageView1 As ImageView
End Sub

Sub Activity_Create(FirstTime As Boolean)
  Activity.LoadLayout("Layout")
  rp.CheckAndRequest(rp.PERMISSION_CAMERA) ''获取i相机权限
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub Activity_PermissionResult (Permission As String, Result As Boolean)
  Log(Permission)
End Sub

''扫码(双击扫码框可以开启灯光)
''扫码目前支持市面上90%的条码,二维码,PDF417码
Private Sub Button1_Click
  Dim ohhzxing As OhhZXing
  ohhzxing.BeginScanCode("QrEvent")
  Wait For QrEvent_result(atype As String,Values As String) ''扫码事件
  EditText1.Text=Values ''扫码结果
End Sub


''创建二维码
Private Sub Button2_Click
  If EditText1.Text="" Then
    ToastMessageShow("内容不能为空",False)
    Return
  End If
  Dim ohhzxing As OhhZXing
  Dim barimg As Bitmap=ohhzxing.CreateQRcode(EditText1.Text,300,300)
  If barimg.IsInitialized Then
    FitCenterBitmap(ImageView1,barimg)
  Else
    ToastMessageShow("创建失败,含有不支持的字符串",False)
  End If
  
End Sub

''创建PDF417二维码
Private Sub Button3_Click
  If EditText1.Text="" Then
    ToastMessageShow("内容不能为空",False)
    Return
  End If
  Dim ohhzxing As OhhZXing
  Dim barimg As Bitmap=ohhzxing.CreatePDF417code(EditText1.Text,300,300)
  If barimg.IsInitialized Then
    FitCenterBitmap(ImageView1,barimg)
  Else
    ToastMessageShow("创建失败,含有不支持的字符串",False)
  End If
End Sub

''创建条形码
Private Sub Button4_Click
  If EditText1.Text="" Then
    ToastMessageShow("内容不能为空",False)
    Return
  End If
  Dim ohhzxing As OhhZXing
  Dim barimg As Bitmap=ohhzxing.CreateBarcode(EditText1.Text,300,150,"CODE_128")
  If barimg.IsInitialized Then
    FitCenterBitmap(ImageView1,barimg)
  Else
    ToastMessageShow("创建失败,含有不支持的字符串",False)
  End If
End Sub

''填充图片
Public Sub FitCenterBitmap(Imv As ImageView, bmp As Bitmap)
  Imv.Bitmap=Null
  Dim cvs As Canvas
  cvs.Initialize(Imv)
  Dim rectDest As Rect
  Dim delta As Int
  If bmp.Width / bmp.Height > Imv.Width / Imv.Height Then
    delta = (Imv.Height - bmp.Height / bmp.Width * Imv.Width) / 2
    rectDest.Initialize(0, delta,Imv.Width, Imv.Height - delta)
  Else
    delta = (Imv.Width - bmp.Width / bmp.Height * Imv.Height) / 2
    rectDest.Initialize(delta, 0, Imv.Width - delta, Imv.Height)
  End If
  cvs.DrawBitmap(bmp, Null, rectDest)
  Imv.Invalidate
End Sub