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zbar,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();
    }
  }