Zxing扫描二维码

1、开源项目地址：https://github.com/zxing/zxing

2、jar包下载地址：http://repo1.maven.org/maven2/com/google/zxing/core/ 可以选择版本号，然后下载。

3、导入demo:  导入android 文件夹即可。

4、网上精简版demo:  http://blog.csdn.net/xiaanming/article/details/10163203 

    http://www.cnblogs.com/dolphin0520/p/3355728.html 

效果图：

caution:

1. 手机横竖屏问题

   位置：CameraConfigurationManager.initFromCameraParameters

   修改代码：if (width < height) {
       camera.setDisplayOrientation(90);//添加的代码
      int temp = width;
      width = height;
      height = temp;
     }

   位置：CameraManager.getFramingRectInPreview

   修改代码： WindowManager manager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE);
     Display display = manager.getDefaultDisplay();
     int width = display.getWidth();
     int height = display.getHeight();
     if (width<height) {
      System.out.println("竖屏");
      rect.left = rect.left * cameraResolution.y / screenResolution.x;
      rect.right = rect.right * cameraResolution.y / screenResolution.x;
      rect.top = rect.top * cameraResolution.x / screenResolution.y;
      rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
     }
     if (width>height) {
      System.out.println("横屏");
      rect.left = rect.left * cameraResolution.x / screenResolution.x;
      rect.right = rect.right * cameraResolution.x / screenResolution.x;
      rect.top = rect.top * cameraResolution.y / screenResolution.y;
      rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
     }

2.扫描结果对话框

   位置：CaptureActivity.handleDecode

  修改代码：if (!TextUtils.isEmpty(result)) {
   AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setMessage(result)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                     //请求网络，发送数据
                     new AsyncTask<String, Void, String>() {
                    @Override
                     protected String doInBackground(String... params) {
                          AccessToServer accessToServer=new AccessToServer  ("http://192.168.254.1:8080/ZxingWeb/sendScancode");
                         return   accessToServer.doPost(new String[]{"content"}, new String[]{result});
                     }
                       protected void onPostExecute(String result) {
                        //System.out.println(result);
                   };
             }.execute();
          //页面跳转打开网页
             Intent mIntent=new Intent(CaptureActivity.this,WebViewActivity.class);
            mIntent.putExtra("url", result);
             startActivity(mIntent);
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                    finish();              //这个地方非常关键，如果不finish()的话，第二次扫描可能要好长时间，或者扫不出来
                    }
                });
        builder.create().show();
          
   /*Intent intent = new Intent();
   intent.putExtra("scan_result", rawResult.getText());
   setResult(RESULT_OK, intent);*/
  } else {
   setResult(RESULT_CANCELED);
  }
  // finish();           //记得要注释掉

3.扫描灵敏度问题

  距离二维码多远能扫描出来？

  多长时间能扫出来？