效果图如下：

制作过程很简单的就是在原始的二维码图片上添加一个logn图标，代码的注释写得很详细，也就不给大家啰嗦了

package com.example.day44_02_qrcodewithlogin;import java.util.HashMap;import java.util.Map;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.os.Bundle;import android.view.Menu;import android.widget.ImageView;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter;public class MainActivity extends Activity {    private ImageView imageView_main ;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		initView();	}	private void initView() {		imageView_main = (ImageView) findViewById(R.id.imageView_main);		String content = "我们要毕业了";		createQRCode(content,500,500);	}    	/**	 * 用于创建一个二维码	 * @param content	 * @param width	 * @param height	 */	private void createQRCode(String content, int width, int height) {				try {			//1,创建实例化对象			QRCodeWriter writer = new QRCodeWriter() ;			//2,设置字符集			Map
     
        map = new HashMap
      
       ();			map.put(EncodeHintType.CHARACTER_SET, "UTF-8");			//3，通过encode方法将内容写入矩阵对象			BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height,map);		    //4，定义一个二维码像素点的数组，向每个像素点中填充颜色			int[] pixels = new int[width*height];		    //5,往每一像素点中填充颜色（像素没数据则用黑色填充，没有则用彩色填充，不过一般用白色）			for (int i = 0; i < height; i++) {				for (int j = 0; j < width; j++) {					if (matrix.get(j, i)) {						pixels[i*width+j] = 0xff000000;					}else {						pixels[i*width+j] = 0xffffffff;					}				}			}			//6,创建一个指定高度和宽度的空白bitmap对象			Bitmap bm_QR = Bitmap.createBitmap(width, height, Config.ARGB_8888);		    //7，将每个像素的颜色填充到bitmap对象			bm_QR.setPixels(pixels, 0, width, 0, 0, width, height);						//8，创建一个bitmap对象用于作为其图标			Bitmap bm_login = BitmapFactory.decodeResource(getResources(), R.drawable.img_kf_qq);			//9，创建一个方法在二维码上添加一张图片			if (addLogin(bm_QR,bm_login) != null) {				imageView_main.setImageBitmap(addLogin(bm_QR,bm_login));			}						} catch (WriterException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}					}		/**	 * 用于向创建的二维码中添加一个logn	 * @param bm_QR	 * @param bm_login	 * @return	 */	private Bitmap addLogin(Bitmap bm_QR, Bitmap bm_login) {		if (bm_QR == null) {			return null;		}		if (bm_login == null) {			return bm_QR ;		}				//获取图片的宽高		int bm_QR_Width = bm_QR.getWidth() ;		int bm_QR_Height = bm_QR.getHeight();		int bm_login_Width = bm_login.getWidth() ;		int bm_login_Height = bm_login.getHeight();				//设置logn的大小为二维码整体大小的1/5		float scale_login = bm_QR_Width*1.0f /5/bm_login_Width ;		Bitmap bitmap = Bitmap.createBitmap(bm_QR_Width, bm_QR_Height, Bitmap.Config.ARGB_8888);	    		 try {	            Canvas canvas = new Canvas(bitmap);	            canvas.drawBitmap(bm_QR, 0, 0, null);	            canvas.scale(scale_login, scale_login, bm_QR_Width / 2, bm_QR_Height / 2);	            canvas.drawBitmap(bm_login, (bm_QR_Width - bm_login_Width) / 2, (bm_QR_Height - bm_login_Height) / 2, null);	 	            canvas.save(Canvas.ALL_SAVE_FLAG);	            canvas.restore();	        } catch (Exception e) {	            bitmap = null;	            e.getStackTrace();	        }	 	        return bitmap;	  	}	@Override	public boolean onCreateOptionsMenu(Menu menu) {		getMenuInflater().inflate(R.menu.main, menu);		return true;	}}