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Android zxing

二维码一般在项目都会用到，今天分享下我开发二维码的一些心得。

zxing介绍

github地址： https://github.com/zxing/zxing

代码很多，官方演示的例子在文件android，一个较为完整的app，导入Android studio，发现少了CameraConfigurationUtils，这个类在文件android-core下。官方效果图：

但是实际开发只需要扫码和生成二维码两个功能就夠了，因此我做了抽离删减，最终我的效果图：

zxing使用

添加依赖

compile 'com.google.zxing:core:3.2.1'

扫描二维码

case R.id.qrcode_dencode: //扫描
intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, REQUEST_CODE);
break;

@Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       if (resultCode == RESULT_OK) { //RESULT_OK = -1
           Bundle bundle = data.getExtras();
           String scanResult = bundle.getString("result");
           Toast.makeText(MainActivity.this, scanResult, Toast.LENGTH_LONG).show();
       }
   }

生成二维码

case R.id.qrcode_encode: //生成
try {
       Bitmap mBitmap = QRCodeEncoder.encodeAsBitmap("http://wuxiaolong.me/", 300);
       qrcodeImg.setImageBitmap(mBitmap);

     } catch (Exception e) {
       e.printStackTrace();
     }
    break;

识别二维码

//长按图片识别二维码
       qrcodeImg.setOnLongClickListener(new View.OnLongClickListener() {
           @Override
           public boolean onLongClick(View v) {
               qrcodeImg.setDrawingCacheEnabled(true);
               Bitmap bitmap = Bitmap.createBitmap(qrcodeImg.getDrawingCache());
               qrcodeImg.setDrawingCacheEnabled(false);
               decodeQRCode(bitmap);
               return true;
           }
       });

/**
   * 解析二维码图片
   *
   * @param bitmap   要解析的二维码图片
   */
  public final Map<DecodeHintType, Object> HINTS = new EnumMap<>(DecodeHintType.class);

  public void decodeQRCode(final Bitmap bitmap) {
      new AsyncTask<Void, Void, String>() {
          @Override
          protected String doInBackground(Void... params) {
              try {
                  int width = bitmap.getWidth();
                  int height = bitmap.getHeight();
                  int[] pixels = new int[width * height];
                  bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
                  RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
                  Result result = new MultiFormatReader().decode(new BinaryBitmap(new HybridBinarizer(source)), HINTS);
                  return result.getText();
              } catch (Exception e) {
                  return null;
              }
          }

          @Override
          protected void onPostExecute(String result) {
              Log.d("wxl", "result=" + result);
              Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
          }
      }.execute();

  }