Android生成和扫描二维码之ZXing-优快云博客

本文介绍如何使用ZXing库生成二维码图片，并提供了一个简单的示例应用。此外，还介绍了如何利用ZXing进行二维码扫描的功能。

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ZXing是一个开源的条码生成和扫描库。它不但支持众多的条码格式，而且有各种语言的实现版本，它支持的语言包括：Java、 C++、 C#、 Objective-C、ActionScript以及Ruby。

[url=http://code.google.com/p/zxing/downloads/list]http://code.google.com/p/zxing/downloads/list[/url]
版本：ZXing-2.3.0

[b]（1）把ZXing的以下两个jar包放入android工程的libs下[/b]
[quote]core/core.jar
javase/javase.jar[/quote]

[b]（2）生成二维码[/b]


public class QRCodeGenerateActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_qrcode_generate);

        Button button = (Button) findViewById(R.id.generate_button);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText editText = (EditText) findViewById(R.id.code_content);
                Bitmap qrcode = generateQRCode(editText.getText().toString());
                ImageView imageView = (ImageView) findViewById(R.id.code_image);
                imageView.setImageBitmap(qrcode);
            }
        });

    }

    private Bitmap bitMatrix2Bitmap(BitMatrix matrix) {
        int w = matrix.getWidth();
        int h = matrix.getHeight();
        int[] rawData = new int[w * h];
        for (int i = 0; i < w; i++) {
            for (int j = 0; j < h; j++) {
                int color = Color.WHITE;
                if (matrix.get(i, j)) {
                    color = Color.BLACK;
                }
                rawData[i + (j * w)] = color;
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(w, h, Config.RGB_565);
        bitmap.setPixels(rawData, 0, w, 0, 0, w, h);
        return bitmap;
    }

    private Bitmap generateQRCode(String content) {
        try {
        	QRCodeWriter writer = new QRCodeWriter();
            // MultiFormatWriter writer = new MultiFormatWriter();
            BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, 500, 500);
            return bitMatrix2Bitmap(matrix);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }
}

[img]http://dl2.iteye.com/upload/attachment/0093/1949/7d321bcc-4304-3136-a1e8-64514a95ccc6.png[/img]

[b]（3）扫描二维码[/b]


private PreviewCallback mPreviewCallback = new PreviewCallback() {
    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        int previewWidth = camera.getParameters().getPreviewSize().width;
        int previewHeight = camera.getParameters().getPreviewSize().height;

        PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
                data, previewWidth, previewHeight, 0, 0, previewWidth,
                previewHeight, false);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Reader reader = new QRCodeReader();
        // Reader reader = new MultiFormatReader();
        try {

            Result result = reader.decode(bitmap);
            String text = result.getText();

            Intent intent = new Intent();
            intent.setData(Uri.parse(text));
            setResult(RESULT_OK, intent);
            finish();
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Not Found", Toast.LENGTH_SHORT).show();
        }
    }
};