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

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) >= <img src="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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评论

1 楼 yanyanquan 2012-04-18  

我尝试过你的办法了。
但扫描的时候 扫描不到条码呢。为什么呢、。
能回复我一下？
我比较急。博主尽量抽点时间回答下我把。因为程序员都比较忙。我了解，谢谢啊