Barcode Scanner (ZXing)


Source link: https://github.com/dm77/barcodescanner

Introduction

Android library projects that provides easy to use and extensible Barcode Scanner views based on ZXing and ZBar.

Screenshots

Minor BREAKING CHANGE in 1.8.4

Version 1.8.4 introduces a couple of new changes:

  • Open Camera and handle preview frames in a separate HandlerThread (#1, #99): Though this has worked fine in my testing on 3 devices, I would advise you to test on your own devices before blindly releasing apps with this version. If you run into any issues please file a bug report.
  • Do not automatically stopCamera after a result is found #115: This means that upon a successful scan only the cameraPreview is stopped but the camera is not released. So previously if your code was calling mScannerView.startCamera() in the handleResult() method, please replace that with a call to mScannerView.resumeCameraPreview(this);

ZXing

Installation

Add the following dependency to your build.gradle file.

compile 'me.dm7.barcodescanner:zxing:1.9.8'

Simple Usage

1.) Add camera permission to your AndroidManifest.xml file:

<uses-permission android:name="android.permission.CAMERA" />

2.) A very basic activity would look like this:

public class SimpleScannerActivity extends Activity implements ZXingScannerView.ResultHandler {

  private ZXingScannerView mScannerView;

@Override
  public void onCreate(Bundle state) {

super.onCreate(state);

mScannerView = new ZXingScannerView(this);

// Programmatically initialize the scanner view

setContentView(mScannerView);

 // Set the scanner view as the content view
  
}

@Override
  public void onResume() {

super.onResume();

mScannerView.setResultHandler(this);
 // Register ourselves as a handler for scan results.

mScannerView.startCamera();

 // Start camera on resume
  
}

@Override
  public void onPause() {

super.onPause();

mScannerView.stopCamera();

  // Stop camera on pause
  
}

@Override
  public void handleResult(Result rawResult) {

// Do something with the result here

Log.v(TAG, rawResult.getText());
 // Prints scan results

Log.v(TAG, rawResult.getBarcodeFormat().toString());
 // Prints the scan format (qrcode, pdf417 etc.)

 // If you would like to resume scanning, call this method below:

mScannerView.resumeCameraPreview(this);

  
}
 
}
 

Please take a look at the zxing-sample project for a full working example.

Advanced Usage

Take a look at the FullScannerActivity.java or FullScannerFragment.java classes to get an idea on advanced usage.

Interesting methods on the ZXingScannerView include:

// Toggle flash: void setFlash(boolean);
  // Toogle autofocus: void setAutoFocus(boolean);
  // Specify interested barcode formats: void setFormats(List<BarcodeFormat> formats);
  // Specify the cameraId to start with: void startCamera(int cameraId);

Specify front-facing or rear-facing cameras by using the void startCamera(int cameraId); method.

For HUAWEI mobile phone like P9, P10, when scanning using the default settings, it won't work due to the "preview size", please adjust the parameter as below:

mScannerView = (ZXingScannerView) findViewById(R.id.zx_view);
  // this paramter will make your HUAWEI phone works great! mScannerView.setAspectTolerance(0.5f);

Supported Formats:

BarcodeFormat.UPC_A BarcodeFormat.UPC_E BarcodeFormat.EAN_13 BarcodeFormat.EAN_8 BarcodeFormat.RSS_14 BarcodeFormat.CODE_39 BarcodeFormat.CODE_93 BarcodeFormat.CODE_128 BarcodeFormat.ITF BarcodeFormat.CODABAR BarcodeFormat.QR_CODE BarcodeFormat.DATA_MATRIX BarcodeFormat.PDF_417

ZBar

Installation

Add the following dependency to your build.gradle file.

compile 'me.dm7.barcodescanner:zbar:1.9.8'

Simple Usage

1.) Add camera permission to your AndroidManifest.xml file:

<uses-permission android:name="android.permission.CAMERA" />

2.) A very basic activity would look like this:

public class SimpleScannerActivity extends Activity implements ZBarScannerView.ResultHandler {

  private ZBarScannerView mScannerView;

@Override
  public void onCreate(Bundle state) {

super.onCreate(state);

mScannerView = new ZBarScannerView(this);

 // Programmatically initialize the scanner view

setContentView(mScannerView);

 // Set the scanner view as the content view
  
}

@Override
  public void onResume() {

super.onResume();

mScannerView.setResultHandler(this);
 // Register ourselves as a handler for scan results.

mScannerView.startCamera();

 // Start camera on resume
  
}

@Override
  public void onPause() {

super.onPause();

mScannerView.stopCamera();

  // Stop camera on pause
  
}

@Override
  public void handleResult(Result rawResult) {

// Do something with the result here

Log.v(TAG, rawResult.getContents());
 // Prints scan results

Log.v(TAG, rawResult.getBarcodeFormat().getName());
 // Prints the scan format (qrcode, pdf417 etc.)

 // If you would like to resume scanning, call this method below:

mScannerView.resumeCameraPreview(this);

  
}
 
}
 

Please take a look at the zbar-sample project for a full working example.

Advanced Usage

Take a look at the FullScannerActivity.java or FullScannerFragment.java classes to get an idea on advanced usage.

Interesting methods on the ZBarScannerView include:

// Toggle flash: void setFlash(boolean);
  // Toogle autofocus: void setAutoFocus(boolean);
  // Specify interested barcode formats: void setFormats(List<BarcodeFormat> formats);

Specify front-facing or rear-facing cameras by using the void startCamera(int cameraId); method.

Supported Formats:

BarcodeFormat.PARTIAL BarcodeFormat.EAN8 BarcodeFormat.UPCE BarcodeFormat.ISBN10 BarcodeFormat.UPCA BarcodeFormat.EAN13 BarcodeFormat.ISBN13 BarcodeFormat.I25 BarcodeFormat.DATABAR BarcodeFormat.DATABAR_EXP BarcodeFormat.CODABAR BarcodeFormat.CODE39 BarcodeFormat.PDF417 BarcodeFormat.QR_CODE BarcodeFormat.CODE93 BarcodeFormat.CODE128 

Rebuilding ZBar Libraries

mkdir some_work_dir cd work_dir wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz tar zxvf libiconv-1.14.tar.gz 

Patch the localcharset.c file: vim libiconv-1.14/libcharset/lib/localcharset.c

On line 48, add the following line of code:

#undef HAVE_LANGINFO_CODESET 

Save the file and continue with steps below:

cd libiconv-1.14 ./configure cd .. hg clone http://hg.code.sf.net/p/zbar/code zbar-code cd zbar-code/android android update project -p . -t 'android-19' 

Open jni/Android.mk file and add fPIC flag to LOCAL_C_FLAGS. Open jni/Application.mk file and specify APP_ABI targets as needed.

ant -Dndk.dir=$NDK_HOME  -Diconv.src=some_work_dir/libiconv-1.14 zbar-clean zbar-all 

Upon completion you can grab the .so and .jar files from the libs folder.

Credits

Almost all of the code for these library projects is based on:

  1. CameraPreview app from Android SDK APIDemos
  2. The ZXing project: https://github.com/zxing/zxing
  3. The ZBar Android SDK: http://sourceforge.net/projects/zbar/files/AndroidSDK/

Contributors

https://github.com/dm77/barcodescanner/graphs/contributors

License

Apache License, Version 2.0

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