Android Zxing生成二维码经典案例分享

本文实例为大家解析了Zxing生成二维码的经典案例，供大家参考，具体内容如下

1、首先呢，先编译 compile ‘com.google.zxing:core:3.2.1'

2、实战

public class QRCode {
private static int IMAGE_HALFWIDTH = 50;//宽度值，影响中间图片大小

public static Bitmap createQRCode() {
 return createQRCode();
}

public static Bitmap createQRCode(String text) {
 return createQRCode(text, 500);
}

public static Bitmap createQRCode(String text, int size) {
 try {
  Hashtable<EncodeHintType, String> hints = new Hashtable<>();
  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
  BitMatrix bitMatrix = new QRCodeWriter().encode(text,
    BarcodeFormat.QR_CODE, size, size, hints);
  int[] pixels = new int[size * size];
  for (int y = 0; y < size; y++) {
   for (int x = 0; x < size; x++) {
    if (bitMatrix.get(x, y)) {
     pixels[y * size + x] = 0xff000000;
    } else {
     pixels[y * size + x] = 0xffffffff;
    }
   }
  }
  Bitmap bitmap = Bitmap.createBitmap(size, size,
    Bitmap.Config.ARGB_8888);
  bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
  return bitmap;
 } catch (WriterException e) {
  e.printStackTrace();
  return null;
 }
}

public static Bitmap createQRCodeWithLogo(String text, Bitmap mBitmap) {
 return createQRCodeWithLogo(text,500,mBitmap);
}

public static Bitmap createQRCodeWithLogo(String text, int size, Bitmap mBitmap) {
 try {
  IMAGE_HALFWIDTH = size/10;
  Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
  
  hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
  BitMatrix bitMatrix = new QRCodeWriter().encode(text,
    BarcodeFormat.QR_CODE, size, size, hints);
  int width = bitMatrix.getWidth();//矩阵高度
  int height = bitMatrix.getHeight();//矩阵宽度
  int halfW = width / 2;
  int halfH = height / 2;
  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);
  int[] pixels = new int[size * size];
  for (int y = 0; y < size; y++) {
   for (int x = 0; x < size; x++) {
    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 (bitMatrix.get(x, y)) {
      pixels[y * size + x] = 0xff000000;
     } else {
      pixels[y * size + x] = 0xffffffff;
     }
    }
   }
  }
  Bitmap bitmap = Bitmap.createBitmap(size, size,
    Bitmap.Config.ARGB_8888);
  bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
  return bitmap;
 } catch (WriterException e) {
  e.printStackTrace();
  return null;
 }
}

3、解析

生成二维码，上面可以做的操作生成带文字和网址、带图片的还有二维码的大小，在代码中都有了详细的总结。

4、对二维码进行放大和缩小的操作

public class MainActivity extends AppCompatActivity {
 Bitmap bp = null;
 ImageView imageview;
 float scaleWidth;
 float scaleHeight;
 int h;
 boolean num = false;
 private Bitmap netfits;
@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 DisplayMetrics dm = new DisplayMetrics();//创建矩阵
 getWindowManager().getDefaultDisplay().getMetrics(dm);
 imageview = (ImageView) findViewById(R.id.imageview);
 bp= BitmapFactory.decodeResource(getResources(),R.drawable.icon);
 netfits = QRCode.createQRCodeWithLogo("张",200,bp);
 int width = netfits.getWidth();
 int height = netfits.getHeight();
 int w = dm.widthPixels; //得到屏幕的宽度
 final int h = dm.heightPixels; //得到屏幕的高度
 scaleWidth = ((float) w) / width;
 scaleHeight = ((float) w) / height;
 imageview.setImageBitmap(netfits);
 imageview.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
   if (num == true) {
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);
    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);
    imageview.setImageBitmap(newBitmap);
    num = false;
   } else {
    Matrix matrix = new Matrix();
    matrix.postScale(1.0f, 1.0f);
    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);
    imageview.setImageBitmap(newBitmap);
    num = true;
   }
  }
 });
}

普通模式下我们可以自己处理：

@Override
public boolean onTouchEvent(MotionEvent event) {
 switch (event.getAction()) {
  case MotionEvent.ACTION_DOWN: //当屏幕检测到第一个触点按下之后就会触发到这个事件。
   if (num == true) {
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);
    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);
    imageview.setImageBitmap(newBitmap);
    num = false;
   } else {
    Matrix matrix = new Matrix();
    matrix.postScale(1.0f, 1.0f);
    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);
    imageview.setImageBitmap(newBitmap);
    num = true;
   }
   break;
 }
 return super.onTouchEvent(event);
}

添加功能：看是否选中，给二维码添加图片

private void initView() {
 editText = (EditText) this.findViewById(R.id.qrcode_et);
 button = (Button) this.findViewById(R.id.qrcode_bt);
 imageView = (ImageView) this.findViewById(R.id.qrcode_iv);
 cb = (CheckBox) this.findViewById(R.id.qrcode_cb);
 button.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
   if (cb.isChecked()){
    Bitmap bitmap = QRCode.createQRCodeWithLogo(editText.getText().toString(), 500,
      BitmapFactory.decodeResource(getResources(),R.drawable.logo_me));
    imageView.setImageBitmap(bitmap);
   }else{
    Bitmap bitmap = QRCode.createQRCode(editText.getText().toString(), 500);
    imageView.setImageBitmap(bitmap);
   }
  }
 });
}

上面是简单的实现对二维码的方法和缩小，如果更好的实现，欢迎交流！

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