B4A Library ZXingLib(integration version)by icefairy333

icefairy333 · Dec 13, 2012

integration version
zxing 2.1 inside
no need to install zx scaner or other apk,just a jar and xml file copy it to b4a library dir,and then use it well.

demo:

B4X:

'Activity module
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.
Dim zx As Zxing_B4A
End Sub

Sub Activity_Create(FirstTime As Boolean)
   'Do not forget to load the layout file created with the visual designer. For example:
   'Activity.LoadLayout("Layout1")
zx.BeginScan("myzx")
End Sub
Sub myzx_result(atype As String,Values As String)
   Log("type:"&atype&"values:"&Values)
   Msgbox("type:"&atype&"values:"&Values,"result")
End Sub
Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

and you must add last text to manifest editor:

B4X:

AddApplicationText(<activity android:name="ice.zxing.CaptureActivity"
         android:screenOrientation="landscape" android:configChanges="orientation|keyboardHidden"
         android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
         android:windowSoftInputMode="stateAlwaysHidden">
      </activity>)

lib doc:
b4aZXing
Author: IceFairy333
Version: 1.5

Zxing_B4A
Events:
- result (atype as String As , Values as String As )
Fields:
- isportrait As Boolean
- useFrontCam As Boolean
Methods:
- BeginScan (EventName As String)
  please handle the event
  add this to manifest:<activity android:name="ice.zxing.CaptureActivity"
  android:screenOrientation="landscape" android:configChanges="orientation|keyboardHidden"
  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
  android:windowSoftInputMode="stateAlwaysHidden"></activity>
Permissions:
- android.hardware.camera
- android.hardware.camera.autofocus
- android.permission.CAMERA
- android.permission.FLASHLIGHT
- android.permission.VIBRATE
- android.permission.WRITE_EXTERNAL_STORAGE

lib doc:
b4aZXing
Author: IceFairy333
Version: 1.2

Zxing_B4A
Events:
- result (atype as String As , Values as String As )
Methods:
- BeginScan (EventName As String)
  please handle the event
  add this to manifest:<activity android:name="ice.zxing.CaptureActivity"
  android:screenOrientation="landscape" android:configChanges="orientation|keyboardHidden"
  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
  android:windowSoftInputMode="stateAlwaysHidden"></activity>
Permissions:
- android.hardware.camera
- android.hardware.camera.autofocus
- android.permission.CAMERA
- android.permission.FLASHLIGHT
- android.permission.VIBRATE
- android.permission.WRITE_EXTERNAL_STORAGE

anyone who has the scan twice,can download the library src to check it on your device,in my phone it works fine:signOops:

notice by Erel:The second scan happens because zx.BeginScan is called from Activity_Create. The activity is recreated when you change the orientation during the scanning.

The solution is simple. Move this call to a different sub (Button_Click for example).

icefairy333 · Dec 18, 2012

bluedude said:
I'm using a Galaxy Nexus and what happens when I use your sample is this:

Scanning code and image is captured but no event is generated
Scanning again and image is captured again and event is generated.

So conclusion is that I have to keep the QR code in the box so that it recognizes the code twice, only the second time an event is generated.

You must be seeing this, cannot imagine you don't have this on your phone. Will try another phone and see what happens.

Cheers,

but the code there is not error:sign0013: I will upload the code,you can see it yourself

icefairy333 · Dec 18, 2012

the library source is upload in #1

bluedude · Dec 18, 2012

Sorry, library development is not my thing. So I conclude you don't have the same problem on your phone. I see some other people having the same problem.

Anyway, thanks for the response! Would love to use it but in my case it won't solve my problem.

Cheers,

bluedude · Dec 18, 2012

Tested it on another old Nexus one and same problem.

joneden · Dec 18, 2012

Hi All,

I've just tested on a Galaxy S2 running CM 10 - Android 4.1.2 and that is fine - I reworked so that a button press triggered the scan and then did a toastmessage to show the barcode.

I also tested on an Acer Liquid Glow - android 4.0.4 and again that worked fine.

Finally I did it on a Nexus and just got the blank screen even with the suggested manifest changes.

My list of improvements if ever possible would be as follows:
Portrait scanning (my app is portrait not landscape)
Embedding of the scan window in a panel (would a question to the developer of the Camera lib help - seeing as it's been done in that?)
Ability to get the bitmap that was seen at the time of the scan.

I'm going to see if I can help you add to the java....

Cheers,

J

Ohanian · Dec 26, 2012

Hi,
i've tried the sample on Asus TF101, but got nothing, when i run the sample i only got a blinking red line, but the camera is not activated.
Any help?

javiers · Dec 27, 2012

The camera can be displayed on a panel...

Hello,
The camera can be displayed on a panel, all in the same layout and activity?

thanks

Erel · Jan 15, 2013

The second scan happens because zx.BeginScan is called from Activity_Create. The activity is recreated when you change the orientation during the scanning.

The solution is simple. Move this call to a different sub (Button_Click for example).

susu · Jan 15, 2013

Hi Erel,

Could you please upgrade this wrapper library? I need turn flash on and capture scanned barcode option but this wrapper didn't support. I tried to use your CameraClass to turn on flash but the camera will be occupied so it can not scan barcode.

Thank you so much.

icefairy333 · Jan 16, 2013

I see.But in my demo I run it without scan twice(device:moto me860 with miui ics).and I have a application using this,I put it in a custom sub,it running well.
to #29 Will do it!

Erel said:
The second scan happens because zx.BeginScan is called from Activity_Create. The activity is recreated when you change the orientation during the scanning.

The solution is simple. Move this call to a different sub (Button_Click for example).

icefairy333 · Jan 16, 2013

:signOopsidn't say to me，I looked it and found that I can't using flash light well，so let the other friends to do it.:sign0013:

susu said:
Hi Erel,

Could you please upgrade this wrapper library? I need turn flash on and capture scanned barcode option but this wrapper didn't support. I tried to use your CameraClass to turn on flash but the camera will be occupied so it can not scan barcode.

Thank you so much.

JTmartins · Feb 13, 2013

Front camera.

Hi,

I've tried the sample, and the app does not run in the tablet. It compiles and as soon as the app goes to the tablet it immediately says " we are sorry B4A Example has been interrupted. "

However if I remove the Manifest lines, I don't get the error, but I get a black screen, and nothing else happens.

Help !!

Tablet OS ICS 4.03
B4A 2.50

icefairy333 · Feb 14, 2013

I don't know what's wrong with you.:sign0013:

JTmartins said:
Hi,

I've tried the sample, and the app does not run in the tablet. It compiles and as soon as the app goes to the tablet it immediately says " we are sorry B4A Example has been interrupted. "

However if I remove the Manifest lines, I don't get the error, but I get a black screen, and nothing else happens.

Help !!

Tablet OS ICS 4.03
B4A 2.50

JTmartins · Feb 14, 2013

Well there is nothing wrong with me personally...

If I use the provided sample "as is"...It throws the mentioned error.

So I was trying to understand why the error was appearing, as it's the first time I compile an app, send it to the device, and get an immediate error before anything else happens. (same on emulator)

As in B4A 2.5 some of the manifest stuff has moved to the code modules, screen orientation, full screen, etc...I tried to take those away from the Manifest editor, and set them in the proper region in Activity.

The error disappeared, but I just get a black screen.

And I really would like to test this to see if it fits my purposes...(currently using ABZxing, works ok, but depends on an external app...I would prefer not to depend on external apps.

Any help so that I could test this, would be welcomed.

Thanks

José

icefairy333 · Feb 15, 2013

used zxing2.1
zxing - Multi-format 1D/2D barcode image processing library with clients for Android, Java - Google Project Hosting

Rick Harris said:
I like your solution and would like to implement it, but is this legal?
Haven't you used elements from the Zxing sourcecode to create your library? How else would this be possible....

thedesolatesoul · Mar 9, 2013

hello icefairy333,
Nice work with the library and thanks for the source.
I am trying to import the source into eclipse but I get weird errors as if some reference is missing.
I was wondering to solve the Nexus 7 front camera problem. In your CameraManager class, in the openDriver method, I think we need to do the following:

B4X:

      cameraId = findFrontFacingCamera();
      if (cameraId < 0) {
        Toast.makeText(this, "No front facing camera found.",
            Toast.LENGTH_LONG).show();
      } else {
        camera = Camera.open(cameraId);
      }

 private int findFrontFacingCamera() {
    int cameraId = -1;
    // Search for the front facing camera
    int numberOfCameras = Camera.getNumberOfCameras();
    for (int i = 0; i < numberOfCameras; i++) {
      CameraInfo info = new CameraInfo();
      Camera.getCameraInfo(i, info);
      if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
        Log.d(DEBUG_TAG, "Camera found");
        cameraId = i;
        break;
      }
    }
    return cameraId;
  }

Can you build a lib version with this?
Thanks

icefairy333 · Mar 9, 2013

to #37 update it on the #0

NJDude · Mar 9, 2013

Ok, close but not cigar.

On the Nexus 7 now I see a blinking red line but no camera, also, the orientation, changing the scanner orientation on the Manifest from landscape to portrait works but the scanning doesn't work, this is not only on the Nexus 7.

B4X:

AddApplicationText(<activity android:name="ice.zxing.CaptureActivity"
android:screenOrientation="landscape"
android:configChanges="orientation|keyboardHidden"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
android:windowSoftInputMode="stateAlwaysHidden">
</activity>)

Also, to get it on landscape or portrait the manifest and the line below must be updated:

B4X:

zx.isportrait = False

Question, would be possible to determine if the device has a front and back cameras? that will be great.

Thanks

icefairy333 · Mar 9, 2013

no idea.
:sign0161:

NJDude said:
Ok, close but not cigar.

On the Nexus 7 now I see a blinking red line but no camera, also, the orientation, changing the scanner orientation on the Manifest from landscape to portrait works but the scanning doesn't work, this is not only on the Nexus 7.

B4X:

AddApplicationText(<activity android:name="ice.zxing.CaptureActivity" android:screenOrientation="landscape" android:configChanges="orientation|keyboardHidden" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:windowSoftInputMode="stateAlwaysHidden"> </activity>)

Also, to get it on landscape or portrait the manifest and the line below must be updated:

B4X:

zx.isportrait = False

Question, would be possible to determine if the device has a front and back cameras? that will be great.

Thanks

icefairy333 · Mar 9, 2013

Rick Harris said:
I like your solution and would like to implement it, but is this legal?
Haven't you used elements from the Zxing sourcecode to create your library? How else would this be possible....

zxing source licences:

B4X:

  "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

B4A Library ZXingLib(integration version)by icefairy333

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