Android►zxing►二维码

实现扫描二维码和生成带logo的二维码

#欢迎来到风的博客
今天讲的是如何引用google的zxing库实现扫描二维码和生成带logo的二维码,源码库可以从github上下载[https://github.com/zxing/zxing];在文章结尾也会分享我的Demo

#####扫描二维码

1
2
Intent startScan = new Intent(MainActivity.this,CaptureActivity.class);
    startActivity(startScan);

#####生成不带logo的二维码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
  String in = input.getText().toString();
                if (in.equals("")) {
                    Toast.makeText(MainActivity.this, "请输入文本", Toast.LENGTH_SHORT).show();
                }
                try {
//TODO 也可以生成二维码
//                    Bitmap qrcod = EncodingHandler.createQRCode(in, 400);
//                    img.setImageBitmap(qrcod);
                    // 写入数据信息到图片
                    int width = 400, height = 400;
                    QRCodeWriter writer = new QRCodeWriter();
                    //把内容编码
                    BitMatrix matrix = writer.encode(in, BarcodeFormat.QR_CODE, width, height);
                    int ms[] = new int[width * height];
                    //变换赋值
                    for (int y = 0; y < height; y++) {
                        for (int x = 0; x < width; x++) {
                            if (matrix.get(x, y)) {
                                //黑点
                                ms[y * width + x] = 0xff000000;
                            } else {
                                //白点
                                ms[y * width + x] = 0xffffffff;
                            }
                        }
                    }
                    //TODO 缓存
                    Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
                    image.setPixels(ms, 0, width, 0, 0, width, height);
                    //TODO 展示图片
                    img.setImageBitmap(image);
                    FileOutputStream out = new FileOutputStream("/sdcard/code2.png");
                    //TODO 压缩
                    image.compress(Bitmap.CompressFormat.PNG, 100, out);
                    Log.e("MMMM", "创建成功");
                } catch (WriterException e) {
                    e.printStackTrace();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }

#####带logo的二维码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
//Todo 带logo的二维码
   @Override
   public void onClick(View v) {
       String in = input.getText().toString();
       if (in.equals("")) {
           Toast.makeText(MainActivity.this, "请输入文本", Toast.LENGTH_SHORT).show();
       }
       try {
           // 写入数据信息到图片
           int width = 400, height = 400;
           QRCodeWriter writer = new QRCodeWriter();
           //把内容编码
           BitMatrix matrix = writer.encode(in, BarcodeFormat.QR_CODE, width, height);
           int ms[] = new int[width * height];
           //变换赋值
           for (int y = 0; y < height; y++) {
               for (int x = 0; x < width; x++) {
                   if (matrix.get(x, y)) {
                       //黑点
                       ms[y * width + x] = 0xff000000;
                   } else {
                       //白点
                       ms[y * width + x] = 0xffffffff;
                   }
               }
           }
           //TODO 缓存
           Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
           image.setPixels(ms, 0, width, 0, 0, width, height);
           //logo地址
           Bitmap logo = BitmapFactory.decodeFile("/sdcard/gur03.png");
           image = insertLogo(image, logo);
           //TODO 展示图片
           img.setImageBitmap(image);
           //存储生成的二维码地址
           FileOutputStream out = new FileOutputStream("/sdcard/code2.png");
           //TODO 压缩
           image.compress(Bitmap.CompressFormat.PNG, 100, out);
           Log.e("MMMM", "创建成功");
       } catch (WriterException e) {
           e.printStackTrace();
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }
   }
   public Bitmap insertLogo(Bitmap src, Bitmap logo) {
       // 获取到两张图片的宽高
       int width = src.getWidth();
       int height = src.getHeight();
       int gwidth = logo.getWidth();
       int gheight = logo.getHeight();
       // 大小图片的比例
       float scale = width * 1.0f / 5 / gwidth;
       // 工作缓冲区
       Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
       // 获取缓冲区的画布
       Canvas ca = new Canvas(bitmap);
       // 话大图片
       ca.drawBitmap(src, 0, 0, null);
       ca.scale(scale, scale, width / 2, height / 2);
       // 话小图片
       ca.drawBitmap(logo, (width - gwidth) / 2, (height - gheight) / 2, null);
       // 保存所画内容
       ca.save(Canvas.ALL_SAVE_FLAG);
       // 还原画布
       ca.restore();
       return bitmap;
   }

注意利用画布将图片覆盖在生成的二维码上,图片是30*30的,
原理是二维码中间有可以忽略的阴影
app引用BarCodeTest类库
Demo下载地址:https://github.com/MyfengNull/QrCode

本文原创下载请注明出处