Android下利用zbar类库实现扫一扫

程序源代码及可执行文件下载地址:http://files.cnblogs.com/rainboy2010/zbardemo.zip

Android下常用的条码扫描类库有zxing和zbaro,比较了一下,发现zbar扫描速度更快,能够识别的条码类型更多,下面就讲解一下如何利用zbar实现扫一扫,先放上一张效果图:

主要代码如下:

 1.在onPreviewFrame方法里获取预览图像，然后传递给DecodeHandler去解析

 @Override

  public void onPreviewFrame(byte[] data, Camera camera) 

  {

	 if (!useOneShotPreviewCallback) 

	 {

	   camera.setPreviewCallback(null);

	 }

	 if(previewHandler != null) 

	 {

		Camera.Parameters parameters = camera.getParameters();

	    Size size = parameters.getPreviewSize();

	    Message message = previewHandler.obtainMessage(previewMessage, size.width,size.height, data);

	    message.sendToTarget();

	    previewHandler = null;

	 } 

	 else 

	 {

	    Log.d(TAG, "Got preview callback, but no handler for it"); 

	 }

	 

   }

2. 在decode方法里调用zbar类库对图像进行解析

 private void decode(byte[] data, int width, int height) {



    Image barcode = new Image(width, height, "Y800");

	Rect scanImageRect = activity.getViewfinderView().getScanImageRect(height,width);

    barcode.setCrop(scanImageRect.top, scanImageRect.left, scanImageRect.bottom, scanImageRect.right);

    barcode.setData(data);



    int result = scanner.scanImage(barcode);

    String strResult="";

    if (result != 0) 

    {

       SymbolSet syms = scanner.getResults();

       for (Symbol sym : syms)

       {

    	   strResult=sym.getData().trim();

    	   if(!strResult.isEmpty())

    	   {

             break;

    	   }

       }

    }

    

    if(!strResult.isEmpty())

    {

       Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, strResult);//Message信息传来传去,有点绕

       Log.d(TAG, "Sending decode succeeded message...");

       message.sendToTarget();

    } 

    else 

    {

        Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);

        message.sendToTarget();

    }

  }