利用ZXing生成二维码

这里需要用到zxing的core.jar包

// 生成QR图private Bitmap createImage(String text) {try {if (TextUtils.isEmpty(text)) {return null;}QRCodeWriter writer = new QRCodeWriter();BitMatrix martix = writer.encode(text, BarcodeFormat.QR_CODE,QR_WIDTH, QR_HEIGHT);Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");BitMatrix bitMatrix = new QRCodeWriter().encode(text,BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);int[] pixels = new int[QR_WIDTH * QR_HEIGHT];for (int y = 0; y < QR_HEIGHT; y++) {for (int x = 0; x < QR_WIDTH; x++) {if (bitMatrix.get(x, y)) {pixels[y * QR_WIDTH + x] = 0xff000000;} else {pixels[y * QR_WIDTH + x] = 0xffffffff;}}}Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);return bitmap;} catch (WriterException e) {e.printStackTrace();return null;}

core.jar下载地址：点击打开链接

对QRcode图片进行解码：

首先需要用到RGBLuminanceSource这个类；

/* * Copyright 2009 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.google.zxing;/** * This class is used to help decode images from files which arrive as RGB data from * an ARGB pixel array. It does not support rotation. * * @author [e-mail] (Daniel Switkin) * @author Betaminos */public final class RGBLuminanceSource extends LuminanceSource {  private final byte[] luminances;  private final int dataWidth;  private final int dataHeight;  private final int left;  private final int top;  public RGBLuminanceSource(int width, int height, int[] pixels) {    super(width, height);    dataWidth = width;    dataHeight = height;    left = 0;    top = 0;    // In order to measure pure decoding speed, we convert the entire image to a greyscale array    // up front, which is the same as the Y channel of the YUVLuminanceSource in the real app.    luminances = new byte[width * height];    for (int y = 0; y < height; y++) {      int offset = y * width;      for (int x = 0; x < width; x++) {        int pixel = pixels[offset + x];        int r = (pixel >> 16) & 0xff;        int g = (pixel >> 8) & 0xff;        int b = pixel & 0xff;        if (r == g && g == b) {          // Image is already greyscale, so pick any channel.          luminances[offset + x] = (byte) r;        } else {          // Calculate luminance cheaply, favoring green.          luminances[offset + x] = (byte) ((r + g + g + b) >> 2);        }      }    }  }    private RGBLuminanceSource(byte[] pixels,                             int dataWidth,                             int dataHeight,                             int left,                             int top,                             int width,                             int height) {    super(width, height);    if (left + width > dataWidth || top + height > dataHeight) {      throw new IllegalArgumentException("Crop rectangle does not fit within image data.");    }    this.luminances = pixels;    this.dataWidth = dataWidth;    this.dataHeight = dataHeight;    this.left = left;    this.top = top;  }  @Override  public byte[] getRow(int y, byte[] row) {    if (y < 0 || y >= getHeight()) {      throw new IllegalArgumentException("Requested row is outside the image: " + y);    }    int width = getWidth();    if (row == null || row.length < width) {      row = new byte[width];    }    int offset = (y + top) * dataWidth + left;    System.arraycopy(luminances, offset, row, 0, width);    return row;  }  @Override  public byte[] getMatrix() {    int width = getWidth();    int height = getHeight();    // If the caller asks for the entire underlying image, save the copy and give them the    // original data. The docs specifically warn that result.length must be ignored.    if (width == dataWidth && height == dataHeight) {      return luminances;    }    int area = width * height;    byte[] matrix = new byte[area];    int inputOffset = top * dataWidth + left;    // If the width matches the full width of the underlying data, perform a single copy.    if (width == dataWidth) {      System.arraycopy(luminances, inputOffset, matrix, 0, area);      return matrix;    }    // Otherwise copy one cropped row at a time.    byte[] rgb = luminances;    for (int y = 0; y < height; y++) {      int outputOffset = y * width;      System.arraycopy(rgb, inputOffset, matrix, outputOffset, width);      inputOffset += dataWidth;    }    return matrix;  }    @Override  public boolean isCropSupported() {    return true;  }  @Override  public LuminanceSource crop(int left, int top, int width, int height) {    return new RGBLuminanceSource(luminances,                                  dataWidth,                                  dataHeight,                                  this.left + left,                                  this.top + top,                                  width,                                  height);  }}

解码的方法：

/** * 对QRcode图片进行解码 *  * @param bitmap *            QRcode图片 * @return 解码后的内容 */public String decodeQRImage(Bitmap bitmap) {String value = null;Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");RGBLuminanceSource source = new RGBLuminanceSource(bitmap);BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));QRCodeReader reader2 = new QRCodeReader();Result result;try {result = reader2.decode(bitmap1, hints);value = result.getText();} catch (NotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ChecksumException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FormatException e) {// TODO Auto-generated catch blocke.printStackTrace();}return value;}