android扫码相机旋转,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
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byte[] rotatedData =new byte[data.length];
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for (int y =0; y < height; y++) {
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for (int x =0; x < width; x++)
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rotatedData[x * height + height - y -1] = data[x + y * width];
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}
3, CameraManager.java, getFramingRectInPreview() need to be modified.
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rect.left = rect.left * cameraResolution.y / screenResolution.x;
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rect.right = rect.right * cameraResolution.y / screenResolution.x;
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rect.top = rect.top * cameraResolution.x / screenResolution.y;
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rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
4, CameraConfigurationManager.java, set camera orientation to portrait in setDesiredCameraParameters() use
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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.
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int tmp = cameraResolution.x;
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cameraResolution.x = cameraResolution.y;
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cameraResolution.y = tmp;
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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)
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if (Integer.parseInt(Build.VERSION.SDK) >=
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setDisplayOrientation(camera,90);
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else {
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if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
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parameters.set("orientation","portrait");
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parameters.set("rotation",90);
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}
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if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
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parameters.set("orientation","landscape");
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parameters.set("rotation",90);
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}
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}
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protected void setDisplayOrientation(Camera camera,int angle) {
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Method downPolymorphic;
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try {
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downPolymorphic = camera.getClass().getMethod(
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"setDisplayOrientation",new Class[] {int.class });
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if (downPolymorphic !=null)
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downPolymorphic.invoke(camera,new Object[] { angle });
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} catch (Exception e1) {
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}
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}