二維碼掃描（橫屏、豎屏、解決豎屏後拉伸問題、美化掃描框）

• 二維碼掃描（橫屏、豎屏、解決豎屏後拉伸問題、美化掃描框）

• 2013-09-29 16:39:37      我來講兩句         做者：夢想天涯

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• 是根據zxing的源碼進行簡化的，不過只支持橫屏。

  其實支持豎屏也挺簡單的：【http://stackoverflow.com/questions/16252791/zxing-camera-in-portrait-mode-on-android】

  Step 1: Add following lines to rotate data before buildLuminanceSource(..) in decode(byte[] data, int width, int height)

   

  DecodeHandler.java:

   

  byte[] rotatedData = new byte[data.length];

  for (int y = 0; y < height; y++) {

      for (int x = 0; x < width; x++)

          rotatedData[x * height + height - y - 1] = data[x + y * width];

  }

  int tmp = width;

  width = height;

  height = tmp;

   

  PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);

  Step 2: Modify getFramingRectInPreview().

   

  CameraManager.java

   

  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;

  Step 3: Disable the check for Landscape Mode in initFromCameraParameters(...)

   

  CameraConfigurationManager.java

   

  //remove the following

  if (width < height) {

    Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");

    int temp = width;

    width = height;

    height = temp;

  }

  Step 4: Add following line to rotate camera insetDesiredCameraParameters(...)

   

  CameraConfigurationManager.java

   

  camera.setDisplayOrientation(90);

  Step 5: Do not forget to set orientation of activity to portrait. I.e: manifest

   

  可是這樣以後，會出現拉伸的問題，解決方法以下：

  更改CameraConfigurationManager.java文件

   

  在 Log.d(TAG, "Screen resolution: " + screenResolution);這句以後增長

  Point screenResolutionForCamera = new Point();

          screenResolutionForCamera.x = screenResolution.x;

          screenResolutionForCamera.y = screenResolution.y;

          // preview size is always something like 480*320, other 320*480

          if (screenResolution.x < screenResolution.y) {

          screenResolutionForCamera.x = screenResolution.y;

          screenResolutionForCamera.y = screenResolution.x;

          }

  再更改cameraResolution = getCameraResolution(parameters, screenResolution);爲cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);

  若是想美化一下取景框，能夠參看代碼：https://code.csdn.net/snippets/64838