MyQrActivity.java

package com.fanxin.huangfangyi.main.activity;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.ImageView;

import com.alibaba.fastjson.JSONObject;
import com.fanxin.huangfangyi.DemoApplication;
import com.fanxin.huangfangyi.R;
import com.fanxin.huangfangyi.ui.BaseActivity;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;


public class MyQrActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fx_activity_qrcode_generate);
        String key = "userInfo:";
        JSONObject jsonObject=DemoApplication.getInstance().getUserJson();
        jsonObject.remove("friends");
        String value = jsonObject.toJSONString();
        Bitmap qrcode = generateQRCode(key+value);
        ImageView imageView = (ImageView) findViewById(R.id.code_image);

       imageView.setImageBitmap(qrcode);


    }


    private Bitmap generateQRCode(String qrCodeString){
        Bitmap bmp = null;    //二维码图片
        QRCodeWriter writer = new QRCodeWriter();
        try {
            BitMatrix bitMatrix = writer.encode(qrCodeString, BarcodeFormat.QR_CODE, 512, 512); //参数分别表示为: 条码文本内容，条码格式，宽，高
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

            //绘制每个像素
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    bmp.setPixel(x, y, bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE);
                }
            }

        } catch (WriterException e) {
            e.printStackTrace();
        }

        return bmp;
    }



}