B4A Library [class] Google Code Scanner - no permission, very simple to use, barcode scanning

This solution is based on ML Kit (https://developers.google.com/ml-kit/vision/barcode-scanning/code-scanner).

Instructions:
1. Add to main module:

#AdditionalJar: com.google.android.gms:play-services-code-scanner
#MultiDex: True

2. Add to manifest editor:

CreateResourceFromFile(Macro, FirebaseAnalytics.GooglePlayBase) 'add if not already there

'******* google code scanner
AddApplicationText(
<meta-data
      android:name="com.google.mlkit.vision.DEPENDENCIES"
      android:value="barcode_ui"/>
 <activity
            android:name="com.google.mlkit.vision.codescanner.internal.GmsBarcodeScanningDelegateActivity"
            android:exported="false"
            android:screenOrientation="portrait"
           >
  </activity>
)
'*****************

'*********  ML kit **********
AddApplicationText(
 <activity
            android:name="com.google.mlkit.vision.documentscanner.internal.GmsDocumentScanningDelegateActivity"
            android:exported="false"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
             >
        </activity>
         <provider
            android:name="com.google.mlkit.common.internal.MlKitInitProvider"
            android:authorities="${applicationId}.mlkitinitprovider"
            android:exported="false"
            android:initOrder="99" />

        <service
            android:name="com.google.mlkit.common.internal.MlKitComponentDiscoveryService"
            android:directBootAware="true"
            android:exported="false"
             >
            <meta-data
                android:name="com.google.firebase.components:com.google.mlkit.common.internal.CommonComponentRegistrar"
                android:value="com.google.firebase.components.ComponentRegistrar" />
        </service>
)
'******************************

Usage:

Private Sub Button1_Click
    Dim formats As List = Array(Scanner.FORMAT_ALL_FORMATS) 'For better performance pass the specific formats needed.
    Wait For (Scanner.Scan(formats)) Complete (Result As ScannerResult)
    If Result.Success Then
        Log(Result.Value)
    End If
End Sub

See attached project.

 

[Erel]

It is better to start a new thread if you are posting a modified library. Otherwise it will cause confusion later on when I update the library and your code is based on an older version.

 

[drgottjr]

mea culpa

 

[Erel]

Project updated with targetSdkVersion=34 and some cleaning.
Depends on B4A v13.0+.

 

[AnandGupta]

Depends on B4A v13.0+.

Thanks. Waiting anxiously for it. ?

 

[Erel]

Beta is available: https://www.b4x.com/android/forum/threads/b4a-v13-0-beta-is-available-for-download.162136/#content
You can try it.

 

[Ryan Pigeon]

This solution is based on ML Kit (https://developers.google.com/ml-kit/vision/barcode-scanning/code-scanner).

Instructions:
1. Add to main module:

#AdditionalJar: com.google.android.gms:play-services-code-scanner
#MultiDex: True

2. Add to manifest editor:

CreateResourceFromFile(Macro, FirebaseAnalytics.GooglePlayBase) 'add if not already there

'******* google code scanner
AddApplicationText(
<meta-data
      android:name="com.google.mlkit.vision.DEPENDENCIES"
      android:value="barcode_ui"/>
 <activity
            android:name="com.google.mlkit.vision.codescanner.internal.GmsBarcodeScanningDelegateActivity"
            android:exported="false"
            android:screenOrientation="portrait"
           >
  </activity>
)
'*****************

'*********  ML kit **********
AddApplicationText(
 <activity
            android:name="com.google.mlkit.vision.documentscanner.internal.GmsDocumentScanningDelegateActivity"
            android:exported="false"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
             >
        </activity>
         <provider
            android:name="com.google.mlkit.common.internal.MlKitInitProvider"
            android:authorities="${applicationId}.mlkitinitprovider"
            android:exported="false"
            android:initOrder="99" />

        <service
            android:name="com.google.mlkit.common.internal.MlKitComponentDiscoveryService"
            android:directBootAware="true"
            android:exported="false"
             >
            <meta-data
                android:name="com.google.firebase.components:com.google.mlkit.common.internal.CommonComponentRegistrar"
                android:value="com.google.firebase.components.ComponentRegistrar" />
        </service>
)
'******************************

Usage:

Private Sub Button1_Click
    Dim formats As List = Array(Scanner.FORMAT_ALL_FORMATS) 'For better performance pass the specific formats needed.
    Wait For (Scanner.Scan(formats)) Complete (Result As ScannerResult)
    If Result.Success Then
        Log(Result.Value)
    End If
End Sub

See attached project.

Error:

** Activity (main) Pause event (activity is not paused). **
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/arch/core/executor/ArchTaskExecutor;
at androidx.lifecycle.LifecycleRegistry.enforceMainThreadIfNeeded(LifecycleRegistry.java:322)
at androidx.lifecycle.LifecycleRegistry.addObserver(LifecycleRegistry.java:178)
at androidx.activity.ComponentActivity.<init>(ComponentActivity.java:277)
at com.google.mlkit.vision.codescanner.internal.GmsBarcodeScanningDelegateActivity.<init>(com.google.android.gmslay-services-code-scanner@@16.1.0:1)
at java.lang.Class.newInstance(Native Method)
at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
at android.app.Instrumentation.newActivity(Instrumentation.java:1378)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4042)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4330)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:139)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:96)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2693)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:230)
at android.os.Looper.loop(Looper.java:319)
at android.app.ActivityThread.main(ActivityThread.java:9063)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:588)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
Caused by: java.lang.ClassNotFoundException: androidx.arch.core.executor.ArchTaskExecutor
... 20 more

 

[Erel]

Download latest version of B4A with an updated SDK: https://www.b4x.com/b4a.html

 

[Ryan Pigeon]

Hi Erel, Got same result. I used the openjdk 19.0.2

 

[Erel]

The Java version isn't relevant. Carefully follow the installation instructions and it will work. Please start a new thread for further discussion.

 

[Ryan Pigeon]

The Java version isn't relevant. Carefully follow the installation instructions and it will work. Please start a new thread for further discussion.

My bad! Set to v34

 

[Erel]

Change the scan code to:

Public Sub Scan (Formats As List) As ResumableSub
    Dim builder As JavaObject
    builder.InitializeNewInstance("com/google/mlkit/vision/codescanner/GmsBarcodeScannerOptions.Builder".Replace("/", "."), Null)
    Dim f(Formats.Size - 1) As Int
    For i = 1 To Formats.Size - 1
        f(i - 1) = Formats.Get(i)
    Next
    builder.RunMethod("setBarcodeFormats", Array(Formats.Get(0), f))
'    builder.RunMethod("enableAutoZoom", Null)
    Dim options As JavaObject = builder.RunMethod("build", Null)
    Dim scanning As JavaObject
    Dim ctxt As JavaObject
    ctxt.InitializeContext
    Dim scanner As JavaObject = scanning.InitializeStatic("com/google/mlkit/vision/codescanner/GmsBarcodeScanning".Replace("/", ".")).RunMethod("getClient", Array(ctxt, options))
    Dim o As JavaObject = scanner.RunMethod("startScan", Null)
    Do While o.RunMethod("isComplete", Null).As(Boolean) = False
        Sleep(50)
    Loop
    Dim res As ScannerResult
    res.Initialize
    If o.RunMethod("isSuccessful", Null) Then
        res.Success = True
        res.Barcode = o.RunMethod("getResult", Null)
        res.Value = res.Barcode.RunMethod("getRawValue", Null)
    Else
        Log("task failed")
        Log(o.RunMethod("getException", Null))
    End If
    Return res
End Sub

What do you see in the logs?

 

[personalapps]

HI, I have to ask for your help. Your code runs perfectly fine on my side without any errors. However, I don't know why, after triggering Private Sub Button1_Click, the o.RunMethod("isSuccessful", Null) in Scan() always returns False, and the camera does not pop up to scan. Did I do something wrong? Please help me. Thank you very much.

check out modified code by @Johan Schoeman in post #13 in the following thread https://www.b4x.com/android/forum/t...e-scanner-based-on-ml-kit-not-working.161137/

 

[Erel]

Code scanner module is not supported on current Google Play Services version, please upgrade.

This is the answer. You need to update the OS or Google Play Services.