android zxing 扫描二维码横屏转竖屏

16lz 2021-12-23

Zxing 竖屏切换 Android

在google上下载的ZxingDemo 为横屏状态

我简单的在Androidmanifest.xml把Activity换成竖屏android:screenOrientation="portrait"

屏幕虽然正了但是屏幕上显示的拍摄画面还是横着的

查了一些网上的资料结合自己手工调试

在这里总结分享一下

步骤:

1) 在AndroidManifest.xml中把标签 CaptureActivity 的screenOrientation修改为

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android:screenOrientation="portrait"

2) 在CameraManager.java类中的getFramingRectInPreview()替换掉原先的 left right top bottom

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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) 在CameraConfigurationManager.java中void setDesiredCameraParameters(Camera camera)方法

在setParameters之前增加

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camera.setDisplayOrientation(90);

4) 在DecodeHandler.java中的 decode(byte[] data, int width, int height)方法在

PlanarYUVLuminanceSource source = CameraManager.get().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;

5) 将CameraConfigurationManager的 initFromCameraParameters(Camera camera)方法整个替换如下

该方法防止竖屏后屏幕拉伸

[java] view plain copy

/**
* Reads, one time, values from the camera that are needed by the app.
*/
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
previewFormat = parameters.getPreviewFormat();
previewFormatString = parameters.get("preview-format");
Log.d(TAG, "Default preview format: " + previewFormat + '/'
+ previewFormatString);
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
screenResolution = new Point(display.getWidth(), display.getHeight());
Log.d(TAG, "Screen resolution: " + screenResolution);
Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
// preview size is always something like 480*320, other 320*480
if (screenResolution.x < screenResolution.y) {
screenResolutionForCamera.x = screenResolution.y;
screenResolutionForCamera.y = screenResolution.x;
}
cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
Log.d(TAG, "Camera resolution: " + screenResolution);
}

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