Android下利用zbar類庫實現掃一掃

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程式原始碼及可執行檔:http://files.cnblogs.com/rainboy2010/zbardemo.zip

Android下常用的條碼掃描類庫有zxing和zbaro,比較了一下,發現zbar掃描速度更快,能夠識別的條碼類型更多,下面就講解一下如何利用zbar實現掃一掃,先放上一張:

主要代碼如下:

 1.在onPreviewFrame方法裡擷取預覽映像，然後傳遞給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方法裡調用zbar類庫對映像進行解析

 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資訊傳來傳去,有點繞       Log.d(TAG, "Sending decode succeeded message...");       message.sendToTarget();    }     else     {        Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);        message.sendToTarget();    }  }

　　

 

Android下利用zbar類庫實現掃一掃