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:
B4X: 
#AdditionalJar: com.google.android.gms:play-services-code-scanner
#MultiDex: True
2. Add to manifest editor:
B4X: 
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:
B4X: 
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.
 

Attachments

  • GoogleCodeScanner.zip
    15.4 KB · Views: 366
Last edited:
Click to expand...
drgottjr

drgottjr

Expert
Licensed User
Longtime User
mea culpa
 
Ryan Pigeon

Ryan Pigeon

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

Instructions:
1. Add to main module:
B4X: 
#AdditionalJar: com.google.android.gms:play-services-code-scanner
#MultiDex: True
2. Add to manifest editor:
B4X: 
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:
B4X: 
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.
Click to expand...
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.gms:play-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

Erel

B4X founder
Staff member
Licensed User
Longtime User
Change the scan code to:
B4X: 
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?
 
P

personalapps

Member
小小伍伍 said:
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.
Click to expand...
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/
 
Beja

Beja

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

Instructions:
1. Add to main module:
B4X: 
#AdditionalJar: com.google.android.gms:play-services-code-scanner
#MultiDex: True
2. Add to manifest editor:
B4X: 
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:
B4X: 
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.
Click to expand...

Hi Erel,
Tried to run the example and got this error msg:

GoogleCodeScanner - 1: Attribute not supported: additionaljar

Any meaning appreciated
 
Beja

Beja

Expert
Licensed User
Longtime User
Erel said:
The example should work as-is. Are you using B4A v13.2?
Click to expand...

Working like charm.. both Barcode and QR Code. Thanks Erel so much -Always!
Updated to v.13.10
 
Last edited:
Beja

Beja

Expert
Licensed User
Longtime User
I tried to scan a QR code that should return wikipedia.org, but the app exited immediately. I tried again, and it exited again after reading the QR code.

On subsequent attempts, it read the code without any problem. I deleted the cookies and restarted the phone. When I tried to scan it again, the app exited immediately the first time but read it successfully on subsequent attempts.
1742851556247.png
 
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