Zxing掃描二維碼

一、開源項目地址：https://github.com/zxing/zxing

二、jar包下載地址：http://repo1.maven.org/maven2/com/google/zxing/core/ 能夠選擇版本號，而後下載。

三、導入demo:  導入android 文件夾便可。

四、網上精簡版demo:  http://blog.csdn.net/xiaanming/article/details/10163203 

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

效果圖：

caution:

1. 手機橫豎屏問題

   位置：CameraConfigurationManager.initFromCameraParameters

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

   位置：CameraManager.getFramingRectInPreview

   修改代碼： 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("豎屏");
      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("橫屏");
      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.掃描結果對話框

   位置：CaptureActivity.handleDecode

  修改代碼：if (!TextUtils.isEmpty(result)) {
   AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setMessage(result)
                .setPositiveButton("肯定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                     //請求網絡，發送數據
                     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();
          //頁面跳轉打開網頁
             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();              //這個地方很是關鍵，若是不finish()的話，第二次掃描可能要好長時間，或者掃不出來
                    }
                });
        builder.create().show();
         
   /*Intent intent = new Intent();
   intent.putExtra("scan_result", rawResult.getText());
   setResult(RESULT_OK, intent);*/
  } else {
   setResult(RESULT_CANCELED);
  }
  // finish();           //記得要註釋掉

3.掃描靈敏度問題

  距離二維碼多遠能掃描出來？

  多長時間能掃出來？