Android(安卓)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

平板视图打印？

`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.

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`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

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`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.

平板视图打印？

`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
(所在文件：CameraConfigurationManager.java)

平板视图打印？

`01`	`if` `(Integer.parseInt(Build.VERSION.SDK) >= <IMG` `class=wp-smiley alt=8) src="http://www.andcoder.com/wp-includes/images/smilies/icon_cool.gif">`

`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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