用字符串生成二维码

需要导入Zxing.jar包

import android.graphics.Bitmap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public class ZxingCode {

   /**
     * 用字符串生成二维码
     * @param str
     */
    public static Bitmap Create2DCode(String str){
        //生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
        BitMatrix matrix = null;
      try {
         matrix = new MultiFormatWriter().encode(str,BarcodeFormat.QR_CODE, 500, 500);
      } catch (WriterException e) {
         e.printStackTrace();
         return null;
      }
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        //二维矩阵转为一维像素数组,也就是一直横着排了
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if(matrix.get(x, y)){
                    pixels[y * width + x] = 0xff000000;
                }  

            }
        }  

        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        //通过像素数组生成bitmap,具体参考api
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }  

}

需要导入Zxing.jar包

import android.graphics.Bitmap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public class ZxingCode {
      
   /** 
     * 用字符串生成二维码 
     * @param str
     */  
    public static Bitmap Create2DCode(String str){  
        //生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败  
        BitMatrix matrix = null;
      try {
         matrix = new MultiFormatWriter().encode(str,BarcodeFormat.QR_CODE, 500, 500);
      } catch (WriterException e) {
         e.printStackTrace();
         return null;
      }  
        int width = matrix.getWidth();  
        int height = matrix.getHeight();  
        //二维矩阵转为一维像素数组,也就是一直横着排了  
        int[] pixels = new int[width * height];  
        for (int y = 0; y < height; y++) {  
            for (int x = 0; x < width; x++) {  
                if(matrix.get(x, y)){  
                    pixels[y * width + x] = 0xff000000;  
                }  
                  
            }  
        }  
          
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);  
        //通过像素数组生成bitmap,具体参考api  
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);  
        return bitmap;  
    }  
   
}