扫描二维码

package com.baidu.erweima;

import com.google.zxing.WriterException;
import com.zxing.activity.CaptureActivity;



import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.DisplayMetrics;
import android.view.Menu;
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 Button atart;
    private EditText edit;
    private Button both;
    private ImageView image;
    int mScreenWidth;
    private Button web;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        
    }

    private void init() {
        
        atart = (Button) findViewById(R.id.start);
        edit = (EditText) findViewById(R.id.edit);
        both = (Button) findViewById(R.id.both);
        image = (ImageView) findViewById(R.id.iv_qr_image);
        web = (Button) findViewById(R.id.start_web);
        //得到屏幕的宽度
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        mScreenWidth = dm.widthPixels;
        //开始扫描二维码
        atart.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                // 调用ZXIng开源项目源码  扫描二维码
                Intent openCameraIntent = new Intent(MainActivity.this,
                        CaptureActivity.class);
                startActivityForResult(openCameraIntent, 0);
            }
        });
        //生成二维码
        both.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                String uri = edit.getText().toString();

                Bitmap bitmap;
                //加入头像，并生成彩色的二维码
                 Bitmap decodeResource = BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.account_icon_qzone);
                try {
                    bitmap = BitmapUtil.makeQRImage(decodeResource,uri, 400,400);
                    if(bitmap != null){
                        image.setImageBitmap(bitmap);
                    }
                } catch (WriterException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                

                //加入头像
                //bitmap = addLogo(bitmap, BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.ic_launcher));
                //添加水印
//                Bitmap gainBitmap = BitmapUtil.gainBitmap(getApplicationContext(),R.drawable.y);
//                bitmap=BitmapUtil.composeWatermark(bitmap ,gainBitmap );
                //添加图片背景
//                Bitmap gainBitmap2 = BitmapUtil.gainBitmap(getApplication(),R.drawable.u);
//                bitmap=BitmapUtil.addBackground(bitmap, gainBitmap2);
                
                
                
            }
        });
        web.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                String text=edit.getText().toString().trim();
                /*Intent intent=new Intent(MainActivity.this,ShowActivity.class);
                intent.putExtra("text", text);
                startActivity(intent);*/
                   Intent intent = new Intent();       
                    intent.setAction("android.intent.action.VIEW");   
                    Uri content_url = Uri.parse(text);  
                    intent.setData(content_url); 
                    startActivity(intent);
                
            }
        });
        
    }
    /**
     * 在二维码中间添加Logo图案
     */
    private static Bitmap addLogo(Bitmap src, Bitmap logo) {
        if (src == null) {
            return null;
        }
 
        if (logo == null) {
            return src;
        }
 
        //获取图片的宽高
        int srcWidth = src.getWidth();
        int srcHeight = src.getHeight();
        int logoWidth = logo.getWidth();
        int logoHeight = logo.getHeight();
 
        if (srcWidth == 0 || srcHeight == 0) {
            return null;
        }
 
        if (logoWidth == 0 || logoHeight == 0) {
            return src;
        }
 
        //logo大小为二维码整体大小的1/5
        float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
        try {
            Canvas canvas = new Canvas(bitmap);
            canvas.drawBitmap(src, 0, 0, null);
            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);
 
            canvas.save(Canvas.ALL_SAVE_FLAG);
            canvas.restore();
        } catch (Exception e) {
            bitmap = null;
            e.getStackTrace();
        }
 
        return bitmap;
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        // 取得返回信息
        if (resultCode == RESULT_OK) {
            Bundle bundle = data.getExtras();
            String scanResult = bundle.getString("result");
            edit.setText(scanResult);
        }
    }

  
    
}

//BitmapUtils

package com.baidu.erweima;

import java.util.Hashtable;
import java.util.Random;

import android.app.ActionBar.LayoutParams;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.util.Log;
import android.view.Gravity;
import android.view.View.MeasureSpec;
import android.widget.LinearLayout;
import android.widget.TextView;

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 com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class BitmapUtil {
    // 将图片变为Bitmap形式
    public static Bitmap gainBitmap(Context context, int drawableId) {
        Bitmap bmp = BitmapFactory.decodeResource(context.getResources(),
                drawableId);
        return bmp;
    }

    /**
     * 生成彩色的二维码
     * */
    
    public static Bitmap makeQRImage(Bitmap logoBmp, String content,
            int QR_WIDTH, int QR_HEIGHT) throws WriterException {

        try {
            
            
            // 图像数据转换，使用了矩阵转换
            Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 容错率
            
            BitMatrix bitMatrix = new QRCodeWriter().encode(content,
                    BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
            int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
            for (int y = 0; y < QR_HEIGHT; y++) {
                // 下面这里按照二维码的算法，逐个生成二维码的图片，//两个for循环是图片横列扫描的结果
                for (int x = 0; x < QR_WIDTH; x++) {
                    if (bitMatrix.get(x, y)) {
                        if (x < QR_WIDTH / 2 && y < QR_HEIGHT / 2) {
                            pixels[y * QR_WIDTH + x] = 0xFF0094FF;// 蓝色
                            Integer.toHexString(new Random().nextInt());
                        } else if (x < QR_WIDTH / 2 && y > QR_HEIGHT / 2) {
                            pixels[y * QR_WIDTH + x] = 0xFFFF0000;// 红色
                        } else if (x > QR_WIDTH / 2 && y > QR_HEIGHT / 2) {
                            pixels[y * QR_WIDTH + x] = 0xFF5ACF00;// 绿色
                        } else {
                            pixels[y * QR_WIDTH + x] = 0xFF000000;// 黑色
                        }
                    } else {
                        pixels[y * QR_WIDTH + x] = 0xffffffff;// 白色
                    }
                }
            }
            
            
            

            // ------------------添加图片部分------------------//
            Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
                    Bitmap.Config.ARGB_8888);
            // 设置像素点
            bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
            // 获取图片宽高
            int logoWidth = logoBmp.getWidth();
            int logoHeight = logoBmp.getHeight();
            if (QR_WIDTH == 0 || QR_HEIGHT == 0) {
                return null;
            }
            if (logoWidth == 0 || logoHeight == 0) {
                return bitmap;
            }
            // 图片绘制在二维码中央，合成二维码图片
            // logo大小为二维码整体大小的1/4
            float scaleFactor = QR_WIDTH * 1.0f / 4 / logoWidth;
            try {
                Canvas canvas = new Canvas(bitmap);
                canvas.drawBitmap(bitmap, 0, 0, null);
                canvas.scale(scaleFactor, scaleFactor, QR_WIDTH / 2,
                        QR_HEIGHT / 2);
                canvas.drawBitmap(logoBmp, (QR_WIDTH - logoWidth) / 2,
                        (QR_HEIGHT - logoHeight) / 2, null);
                canvas.save(Canvas.ALL_SAVE_FLAG);
                canvas.restore();
                return bitmap;
            } catch (Exception e) {
                bitmap = null;
                e.getStackTrace();
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 在图片右下角添加水印
     * 
     * @param srcBMP
     *            原图
     * @param markBMP
     *            水印图片
     * @return 合成水印后的图片
     */
    public static Bitmap composeWatermark(Bitmap srcBMP, Bitmap markBMP) {
        if (srcBMP == null) {
            return null;
        }
        // 创建一个新的和SRC长度宽度一样的位图
        Bitmap newb = Bitmap.createBitmap(srcBMP.getWidth(),
                srcBMP.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas cv = new Canvas(newb);
        // 在 0，0坐标开始画入原图
        cv.drawBitmap(srcBMP, 0, 0, null);
        // 在原图的右下角画入水印
        cv.drawBitmap(markBMP, srcBMP.getWidth() - markBMP.getWidth() * 4 / 5,
                srcBMP.getHeight() * 2 / 7, null);
        // 保存
        cv.save(Canvas.ALL_SAVE_FLAG);
        // 存储
        cv.restore();
        return newb;
    }

    // 添加背景图片
    public static Bitmap addBackground(Bitmap foreground, Bitmap background) {
        //得到图片的宽和高
        int bgWidth = background.getWidth();
        int bgHeight = background.getHeight();
        //得到二维码的宽和高
        int fgWidth = foreground.getWidth();
        int fgHeight = foreground.getHeight();
        
        Bitmap newmap = Bitmap.createBitmap(bgWidth, bgHeight,
                Bitmap.Config.ARGB_8888);
        
        Canvas canvas = new Canvas(newmap);
        canvas.drawBitmap(background, 0, 0, null);
        canvas.drawBitmap(foreground, (bgWidth - fgWidth) / 2,
                (bgHeight - fgHeight) * 3 / 5 + 70, null);
        canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.restore();
        return newmap;
    }

}