Android Question BroadCastReceiver: can't catch data from device

L

Luca Rinaldoni

Member
Licensed User
Hi!
I try to use BroadCastReceiver for a new project because I must "capture" some data that arrives from a scanner of barcode. On device's SDK, I found sample for register a broadcast receiver.

In B4A's site I had download BroadcastReceiver 2.0, but I could not make.

The SDK's sample is:

Code: 
private void registerBarcodeScannerBroadcastReceiver() { 
//Enable the Output via API mode; do not add a line feed; turn Good Read LED on 
Intent intent = new Intent ("ACTION_BAR_SCANCFG"); 
intent.putExtra("EXTRA_SCAN_MODE", 3); i
ntent.putExtra("EXTRA_SCAN_AUTOENT", 0); 
intent.putExtra("EXTRA_SCAN_NOTY_LED", 1); 

sendBroadcast(intent); registerReceiver(barcodeScannerBroadcastReceiver, new IntentFilter("nlscan.action.SCANNER_RESULT")); 
}

private void unregisterBarcodeScannerBroadcastReceiver() { unregisterReceiver(barcodeScannerBroadcastReceiver); 
}

private BroadcastReceiver barcodeScannerBroadcastReceiver = new BroadcastReceiver() { 
@Override 
public void onReceive(Context context, Intent intent) { 
             final String scanResult_1=intent.getStringExtra("SCAN_BARCODE1"); 
             final String scanStatus = intent.getStringExtra("SCAN_STATE"); 
             if (null==scanResult_1 || null==scanStatus || scanResult_1.isEmpty() 
                             || scanStatus.isEmpty())   { 
                 return; } 
             if ("ok".equals(scanStatus)) { 
                   tvBarcode.setText(scanResult_1); 
                   int codeId = intent.getIntExtra("SCAN_BARCODE_TYPE", -1); 
                   tvCodeId.setText(""+codeId); 
              } 
      } 
};


I try to translate (like tutorial explain) in a service:

Code: 
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim Broadcast As BroadCastReceiver
   
End Sub

Sub Service_Create
    Broadcast.Initialize("BroadcastReceiver")
End Sub

Sub Service_Start (StartingIntent As Intent)
   
'Sample from B4A   
'    Broadcast.addAction("android.provider.Telephony.SMS_RECEIVED")
'    Broadcast.addAction(Broadcast.SMS_RECEIVED)
'    Broadcast.SetPriority(2147483647)
'    Broadcast.registerReceiver("")
   
   
    Broadcast.addAction("ACTION_BAR_SCANCFG")
    Broadcast.addAction("EXTRA_SCAN_MODE=3")
    Broadcast.addAction("EXTRA_SCAN_AUTOENT=0")
    Broadcast.addAction("EXTRA_SCAN_NOTY_LED=1")
    Broadcast.registerReceiver("nlscan.action.SCANNER_RESULT")
   
   
End Sub

'Sample from B4A
'Sub BroadcastReceiver_OnReceive (Action As String)
'    ToastMessageShow(Action, False)
'    'can only abort when sendOrderedbroadcast is called.
'    Broadcast.AbortBroadcast
'   
'End Sub

Sub BroadcastReceiver_OnReceive(context As Object, intent1 As Intent)

    If (intent1.HasExtra("SCAN_BARCODE1")) Then
        Log("Found BARCODE1")
    End If
   
    Broadcast.AbortBroadcast
End Sub

Sub Service_Destroy

End Sub


I don't understand how use a "putExtra" method and how read data, using "getStringExtra" or similar.
The OnReceive event raised.

Have any idea?


Best regards!
 
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Hi Erel,

Code: 
Sub BroadcastReceiver_OnReceive(context As Object, intent1 As Intent)

    Log(intent1)
    Log(intent1.ExtrasToString)
   
    Broadcast.AbortBroadcast
End Sub

On log's tab, I can see this.

Code: 
Intent1:Intent { act=nlscan.action.SCANNER_RESULT flg=0x10 (has extras) }
-------------------
Error occurred on line: 47 (BroadcastService)
java.lang.RuntimeException: Method: ExtrasToString not found in: android.content.Intent
    at anywheresoftware.b4a.shell.Shell$MethodCache.getMethod(Shell.java:970)
    at anywheresoftware.b4a.shell.Shell.getMethod(Shell.java:623)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:709)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:249)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:163)
    at com.rootsoft.broadcastreceiver.BroadCastReceiver$1.onReceive(BroadCastReceiver.java:110)
    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:768)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5017)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Pause, UserClosed = true **
** Service (broadcastservice) Destroy **
** Service (starter) Destroy **


OnReceive event is implemented on service.

Thanks, in advance...

Matteo
 
Upvote 0
Erel,
In adding, I'm not be able to translate the SDK's sample where used "putExtra"; this method on library not exist and I using "addAction": I think that is not the same thing.

Thanks about your time...

Matteo
 
Upvote 0
Hi Erel,
I've same error.

The code:
Code: 
    Dim in As Intent = intent1
    Try
        Log(in)
    Catch
        Log(LastException)
    End Try
       
    Try
        Log(in.ExtrasToString)
    Catch
        Log(LastException)
    End Try

produce this log:

Intent { act=nlscan.action.SCANNER_RESULT flg=0x10 (has extras) }

java.lang.RuntimeException: Method: ExtrasToString not found in: android.content.Intent

I think this: until I manage the putExtra, I will not have populated ExtrasToStrings.
I seen this post: https://www.b4x.com/android/forum/threads/intent-putextra-does-not-add-object-to-extras.57980/
but in BroadCastReceiver isn't implemented a similar method of "putExtra".

What's do you think?

Matteo
 
Upvote 0
In Main activity:

Code: 
StartService(BroadcastService)


On Service_Start there is problem: I used "addAction" and not "putExtra".
The original code, from device's SDK, is:
Code: 
Intent intent = new Intent ("ACTION_BAR_SCANCFG");
intent.putExtra("EXTRA_SCAN_MODE", 3); i
ntent.putExtra("EXTRA_SCAN_AUTOENT", 0);
intent.putExtra("EXTRA_SCAN_NOTY_LED", 1);

but BroadCastReceiver library don't implemented a similar method of "putExtra".


Service code:

Code: 
#Region  Service Attributes
    #StartAtBoot: False
  
#End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim Broadcast As BroadCastReceiver
  
End Sub

Sub Service_Create
    Broadcast.Initialize("BroadcastReceiver")
End Sub

Sub Service_Start (StartingIntent As Intent)
  
'Sample from B4A  
'    Broadcast.addAction("android.provider.Telephony.SMS_RECEIVED")
'    Broadcast.addAction(Broadcast.SMS_RECEIVED)
'    Broadcast.SetPriority(2147483647)
'    Broadcast.registerReceiver("")
  
  
    Broadcast.addAction("ACTION_BAR_SCANCFG")
    Broadcast.addAction("EXTRA_SCAN_MODE=3")
    Broadcast.addAction("EXTRA_SCAN_AUTOENT=0")
    Broadcast.addAction("EXTRA_SCAN_NOTY_LED=1")
    Broadcast.registerReceiver("nlscan.action.SCANNER_RESULT")
     
End Sub

'Sample from B4A
'Sub BroadcastReceiver_OnReceive (Action As String)
'    ToastMessageShow(Action, False)
'    'can only abort when sendOrderedbroadcast is called.
'    Broadcast.AbortBroadcast
'  
'End Sub

Sub BroadcastReceiver_OnReceive(context As Object, intent1 As Intent)

    Dim in As Intent = intent1
    Try
        Log(in)
    Catch
        Log(LastException)
    End Try
      
    Try
        Log(in.ExtrasToString)
    Catch
        Log(LastException)
    End Try
      
  
    Broadcast.AbortBroadcast
End Sub

Sub Service_Destroy
    Broadcast.unregisterReceiver
End Sub



Thanks for your time.

Matteo
 
Last edited by a moderator:
Upvote 0
Peter Simpson said:
Which barcode scanner is it?
Last week thanks to a hint from DonManfred I was able to capture all the information that I needed from one of the latest Android 7.0 powered 1D/2D/NFC on the market.

So the intent to listen for is nlscan.action.SCANNER_RESULT
Click to expand...


Hi Peter!
Thanks for you reply.
I try to capture data from a scans of EAN8 and EAN13. Device has installed Android 4.4.2.
If I configure it as "Simuate keystroke" data has capture, but is a workaround: with "intent" and broadcast receiver, returns other information, like type of barcode.

Matteo
 
Upvote 0
Erel said:
Pay attention to my previous post (#5). The parameter type should be object.
Click to expand...

My mistake, sorry! Now it's ok! I tested solution.
Many thanks!

Last thing: about "putExtra", do you have any idea for implementation?

This code (from device's SDK):
Code: 
Intent intent = new Intent ("ACTION_BAR_SCANCFG"); 
intent.putExtra("EXTRA_SCAN_MODE", 3); i
ntent.putExtra("EXTRA_SCAN_AUTOENT", 0); 
intent.putExtra("EXTRA_SCAN_NOTY_LED", 1);

I don't think that best translation, in B4A, is:

Code: 
    Broadcast.addAction("ACTION_BAR_SCANCFG")
    Broadcast.addAction("EXTRA_SCAN_MODE=3")
    Broadcast.addAction("EXTRA_SCAN_AUTOENT=0")
    Broadcast.addAction("EXTRA_SCAN_NOTY_LED=1")
    Broadcast.registerReceiver("nlscan.action.SCANNER_RESULT")


Thanks!

Matteo
 
Upvote 0
So SCAN_BARCODE_TYPE returns the type of barcode you have scanned, EAN8, EAN13, QR etc but as a number, SCAN_STATE returns the current state of the scanner (I presume open/closed), so I'm going to presume that SCAN_BARCODE1 brings back the scanned barcode information?

1. Is that the entire SDK demo code in MainActivity
2. What exactly are SCAN_BARCODE1, SCAN_BARCODE_TYPE and SCAN_STATE returning for you in the B4A logs???

You should start with just registering the receiver "nlscan.action.SCANNER_RESULT" and in the _OnReceive sub just reading the basics responses.
 
Upvote 0
Peter Simpson said:
So SCAN_BARCODE_TYPE returns the type of barcode you have scanned, EAN8, EAN13, QR etc but as a number, SCAN_STATE returns the current state of the scanner (I presume open/closed), so I'm going to presume that SCAN_BARCODE1 brings back the scanned barcode information?

1. Is that the entire SDK demo code in MainActivity
2. What exactly are SCAN_BARCODE1, SCAN_BARCODE_TYPE and SCAN_STATE returning for you in the B4A logs???

You should start with just registering the receiver "nlscan.action.SCANNER_RESULT" and in the _OnReceive sub just reading the basics responses.
Click to expand...

Yes! Thanks! Now working fine. Thanks for you time.
 
Upvote 0
Erel said:
Luca you are confusing two different things.
There are two things here:

1. The broadcast receiver.
2. A broadcasted intent.

The intent should be created with the Intent object and should be broadcasted with Phone.SendBroadcast.
Click to expand...

Ok, I will modify code for test your suggest.
Many thanks for you time.
 
Upvote 0
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