<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.erweima.MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="生成" />

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/button1"

        android:layout_alignBottom="@+id/button1"

        android:layout_alignParentRight="true"

        android:layout_marginRight="19dp"

        android:ems="10" />

    <ImageView

        android:id="@+id/imageView1"

        android:layout_width="435dp"

        android:layout_height="435dp"

        android:layout_alignParentBottom="true"

        android:layout_alignParentRight="true" />

</RelativeLayout>

package com.example.erweima;

import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.WriterException;

import com.google.zxing.common.BitMatrix;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Matrix;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

public class MainActivity extends Activity {

    private EditText et1;

    private Button btn1;

    private ImageView iv1;

    private static final int IMAGE_HALFWIDTH = 50;//图片宽度值大小

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et1 = (EditText)findViewById(R.id.editText1);//输入框

        btn1 = (Button)findViewById(R.id.button1);//按钮

        iv1 = (ImageView)findViewById(R.id.imageView1);//生成图片的位置

        btn1.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                //取出字符串

                String toMakePic_string = et1.getText().toString().trim();

                Bitmap logo= BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);//二维码中间的图片

                try {

                    Bitmap bm=createCode(toMakePic_string,logo,BarcodeFormat.QR_CODE);

                    iv1.setImageBitmap(bm);

                } catch (WriterException e) {

                    e.printStackTrace();

                }

            }

        });

    }

    public Bitmap createCode(String string,Bitmap mBitmap, BarcodeFormat format)throws WriterException {

        //Matrix，中文里叫矩阵，在图像处理方面，主要是用于平面的缩放、平移、旋转等操作。

        Matrix m = new Matrix();

        float sx = (float) 2 * IMAGE_HALFWIDTH / mBitmap.getWidth();

        float sy = (float) 2 * IMAGE_HALFWIDTH / mBitmap.getHeight();

        m.setScale(sx, sy);//设置缩放信息

        //将logo图片按martix设置的信息缩放

        mBitmap = Bitmap.createBitmap(mBitmap, 0, 0,mBitmap.getWidth(), mBitmap.getHeight(), m, false);

        MultiFormatWriter writer = new MultiFormatWriter();

        Hashtable hst = new Hashtable();

        hst.put(EncodeHintType.CHARACTER_SET, "UTF-8");//设置字符编码

        //生成二维码矩阵信息

        BitMatrix matrix = writer.encode(string, format, 800, 800, hst);

        int width = matrix.getWidth();//矩阵高度

        int height = matrix.getHeight();//矩阵宽度

        int halfW = width / 2;

        int halfH = height / 2;

        int[] pixels = new int[width * height];//定义数组长度为矩阵高度*矩阵宽度，用于记录矩阵中像素信息

        for (int y = 0; y < height; y++) {//从行开始迭代矩阵

            for (int x = 0; x < width; x++) {//迭代列

                if (x > halfW - IMAGE_HALFWIDTH && x < halfW + IMAGE_HALFWIDTH && y > halfH - IMAGE_HALFWIDTH && y < halfH + IMAGE_HALFWIDTH) {

                    //该位置用于存放图片信息

                    //记录图片每个像素信息

                    pixels[y * width + x] = mBitmap.getPixel(x - halfW+ IMAGE_HALFWIDTH, y - halfH + IMAGE_HALFWIDTH);

                }

                else {

                    if (matrix.get(x, y)) {

                        //如果有黑块点，记录信息

                        pixels[y * width + x] = 0xff000000;//记录黑块信息

                    }

                }

            }

        }

        Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);

        // 通过像素数组生成bitmap

        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

        return bitmap;

    }

}