Android Zxing 扫描条码实现竖屏模式(portrait mode) 摄像头camera 旋转90度

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最近在搞一个关于条形码扫描的软件,需求需要扫描时是竖屏。
最后在zxing官方wiki上面找到解决办法。基本思路如下。
There are 4 relative files:
1, manifest.xml, you need to make CaptureActivity portrait.

2, DecodeHandler.java, rotate data before buildLuminanceSource, it works becuase in YCbCr_420_SP and YCbCr_422_SP, the Y channel is planar and appears first

1 byte[] rotatedData = new byte[data.length];
2 for (int y = 0; y < height; y++) {
3     for (int x = 0; x < width; x++)
4         rotatedData[x * height + height - y - 1] = data[x + y * width];
5 }

3, CameraManager.java, getFramingRectInPreview() need to be modified.

1 rect.left = rect.left * cameraResolution.y / screenResolution.x;
2 rect.right = rect.right * cameraResolution.y / screenResolution.x;
3 rect.top = rect.top * cameraResolution.x / screenResolution.y;
4 rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;

4, CameraConfigurationManager.java, set camera orientation to portrait in setDesiredCameraParameters() use

1 parameters.set("orientation", "portrait");

注：版本兼容请看下面。
and in getCameraResolution(), you need to swap x and y, because camera preview size is something like 480*320, other than 320*480.

1 int tmp = cameraResolution.x;
2 cameraResolution.x = cameraResolution.y;
3 cameraResolution.y = tmp;
4 return cameraResolution;

说明：
关于摄像头旋转90度的时候，不同的sdk版本方法不同。
兼容方法如下

01 if (Integer.parseInt(Build.VERSION.SDK) >= "http://www.andcoder.com/wp-includes/images/smilies/icon_cool.gif" alt="8)" class="wp-smiley">
02    setDisplayOrientation(camera, 90);
03   else {
04    if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
05     parameters.set("orientation", "portrait");
06     parameters.set("rotation", 90);
07    }
08    if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
09     parameters.set("orientation", "landscape");
10     parameters.set("rotation", 90);
11    }
12 }
13
14 protected void setDisplayOrientation(Camera camera, int angle) {
15   Method downPolymorphic;
16   try {
17    downPolymorphic = camera.getClass().getMethod(
18      "setDisplayOrientation", new Class[] { int.class });
19    if (downPolymorphic != null)
20     downPolymorphic.invoke(camera, new Object[] { angle });
21   } catch (Exception e1) {
22   }
23  }

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