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。
android:screenOrientation="portrait"
2>. CameraManager类中的getFramingRectInPreview()方法,将left, right, top, bottom改变。
//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
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
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
double screenAspectRatio; if (screenResolution.x > screenResolution.y) { screenAspectRatio = (double) screenResolution.x / (double) screenResolution.y; } else { screenAspectRatio = (double) screenResolution.y / (double) screenResolution.x; }
2>. 至此,识别率已经很大程度上的提高了,若在要提高识别率,可通过修改CameraManager类中的MAX_FRAME_WIDTH和MAX_FRAME_HEIGHT来提高精度。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。