【ZXing】Android使用zxing生成二维码图片

GitHub开源地址：https://github.com/zxing/zxing

ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。 其提供了多种平台下的客户端包括：J2ME、J2SE和Android。

Android平台二维码生成并添加Logo图像的方法如下：

注：本例中使用的是core-2.3-SNAPSHOT.jar和javase-2.3-SNAPSHOT.jar两个Jar包，下载地址：

http://download.csdn.net/detail/wenbitianxiafeng/9073437

package com.feng.androidtest;

import java.util.Hashtable;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.ImageView;

import com.feng.test.R;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class MainActivity extends Activity {

private ImageView mTestIv;

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

        mTestIv = (ImageView) findViewById(R.id.iv_test);
        mTestIv.setImageBitmap(generateQRCode("测试内容！"));
    }

    /**
     * 图像数据转换
     * @param matrix
     * @return
     */
    private Bitmap bitMatrix2Bitmap(BitMatrix matrix) {
        int w = matrix.getWidth();
        int h = matrix.getHeight();
        int[] rawData = new int[w * h];
        //按照二维码的算法，采用矩阵转换，逐个生成二维码的图片
        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;
    }

    /**
     * 生成二维码
     * @param content
     * @return Bitmap对象
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
private Bitmap generateQRCode(String content) {
        try {
        //配置参数
        Hashtable hints = new Hashtable();
        //设置编码格式，防止汉字乱码
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            //设置容错级别
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); 
            //设置空白边距的宽度，默认为4
            hints.put(EncodeHintType.MARGIN, 2);

        QRCodeWriter writer = new QRCodeWriter();
            BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, 500, 500, hints);
            return addLogo(bitMatrix2Bitmap(matrix), BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 在二维码图片中添加Logo图片
     * @param src
     * @param logo
     * @return
     */
    private static Bitmap addLogo(Bitmap src, Bitmap logo) { 
        if (src == null) { 
            return null; 
        } 

        if (logo == null) { 
            return src; 
        } 

        //获取图片的宽高 
        int srcWidth = src.getWidth(); 
        int srcHeight = src.getHeight(); 
        int logoWidth = logo.getWidth(); 
        int logoHeight = logo.getHeight(); 

        if (srcWidth == 0 || srcHeight == 0) { 
            return null; 
        } 

        if (logoWidth == 0 || logoHeight == 0) { 
            return src; 
        } 

        //logo大小为二维码整体大小的1/5 
        float scaleFactor = srcWidth * 1.0f / 5 / logoWidth; 
        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888); 
        try { 
            Canvas canvas = new Canvas(bitmap); 
            canvas.drawBitmap(src, 0, 0, null); 
            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2); 
            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null); 

            canvas.save(Canvas.ALL_SAVE_FLAG); 
            canvas.restore(); 
        } catch (Exception e) { 
            bitmap = null; 
            e.getStackTrace(); 
        } 

        return bitmap; 
    } 

}

拓展：

Zxing条形码扫描：http://blog.csdn.net/xiaanming/article/details/10163203