Android Zxing 转换竖屏扫描且提高识别率的方法

本篇文章主要介绍了Android Zxing 转换竖屏扫描且提高识别率的方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

最近的一个Android需要用到扫码功能，用的是Zxing开源库。Zxing的集成就不说了，但是Zxing默认的是横屏扫码，在实际生产中并不适用，需要改为竖屏扫描。

转竖屏步骤：

1>. AndroidManifest.xml中把activity标签CaptureActivity部分的screenOrientation改为portrait。

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									android:screenOrientation="portrait"

2>. CameraManager类中的getFramingRectInPreview()方法，将left， right， top， bottom改变。

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									//竖屏

									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;

3>. CameraConfigurationManager类中的setDesiredCameraParameters(OpenCamera camera, boolean safeMode)方法，在setParameters之前添加

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									theCamera.setDisplayOrientation(90);

4>. DecodeHandler类中的decode(byte[] data, int width, int height)方法，在PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(data, width, height)之前添加

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									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; // Here we are swapping, that's the difference to #11

									width = height;

									height = tmp;

									data = rotatedData;

此时，竖屏扫描已经可以实现了，但是扫描复杂的图码时，分辨率低的已经分不清纹理了，很难识别出来，所以需要优化识别率。

识别率优化：

1>. CameraConfigurationUtils类中的findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution)方法，将double screenAspectRatio = screenResolution.x / (double) screenResolution.y改为

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									double screenAspectRatio;

									if (screenResolution.x > screenResolution.y) {

									  screenAspectRatio = (double) screenResolution.x / (double) screenResolution.y;

									} else {

									  screenAspectRatio = (double) screenResolution.y / (double) screenResolution.x;

									}