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;  

    }  

   

}

用字符串生成二维码