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android zbarsdk使用环境,ZBar Android scan local QR or bar code image

I am trying to scan a local image through ZBar, but as ZBar don't give any documentation for Android but only give detailed documentation for iPhone I had customized camera test activity too much. But I didn't get any success.

In ZBar cameratest activity

PreviewCallback previewCb = new PreviewCallback() {

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

Camera.Parameters parameters = camera.getParameters();

Size size = parameters.getPreviewSize();

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

barcode.setData(data);

int result = scanner.scanImage(barcode);

if (result != 0) {

previewing = false;

mCamera.setPreviewCallback(null);

mCamera.stopPreview();

SymbolSet syms = scanner.getResults();

for (Symbol sym : syms) {

scanText.setText("barcode result " + sym.getData());

barcodeScanned = true;

}

}

}

};

I want to customize this code so that it uses a local image from the gallery and gives me the result. How do I customize this code for giving a local image from the gallery and scan that image?