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
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@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");
}
}
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2. 在decode方法里调用zbar类库对图像进行解析
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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();
}
}
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