在Android上的纵向模式中的Zxing相机

Question

我想portrait在Zxing相机上显示方向.

如何才能做到这一点？

Answer 1

这是它的工作原理.

步骤1:buildLuminanceSource(..)在解码之前添加以下行来旋转数据(byte [] data,int width,int height)

DecodeHandler.java:

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;
width = height;
height = tmp;

PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);

第2步:修改getFramingRectInPreview().

CameraManager.java

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;

第3步:禁用格式模式检查 initFromCameraParameters(...)

CameraConfigurationManager.java

//remove the following
if (width < height) {
  Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
  int temp = width;
  width = height;
  height = temp;
}

第4步:添加以下行以旋转相机setDesiredCameraParameters(...)

CameraConfigurationManager.java

camera.setDisplayOrientation(90);

第5步:不要忘记将活动方向设置为肖像.即:清楚

Answer 2

要在旋转活动时自动支持所有方向和更改,请执行此操作,您只需要修改CameraManager.java类.

并从CaptureActivity.java中删除此方法getCurrentOrientation()

在CameraManager.java中创建此变量:

int resultOrientation;

将其添加到openDriver(..)方法:

setCameraDisplayOrientation(context, Camera.CameraInfo.CAMERA_FACING_BACK, theCamera);//this can be set after camera.setPreviewDisplay(); in api13+.

****创建此方法****链接:http://developer.android.com/reference/android/hardware/Camera.html

public static void setCameraDisplayOrientation(Context context,int cameraId, android.hardware.Camera camera) {
    android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
    android.hardware.Camera.getCameraInfo(cameraId, info);
    Display display = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    int degrees = 0;
    switch (display.getRotation()) {
    case Surface.ROTATION_0: degrees = 0; break;
    case Surface.ROTATION_90: degrees = 90; break;
    case Surface.ROTATION_180: degrees = 180; break;
    case Surface.ROTATION_270: degrees = 270; break;
    }


    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        resultOrientation = (info.orientation + degrees) % 360;
        resultOrientation = (360 - resultOrientation) % 360;  // compensate the mirror
    } else {  // back-facing
        resultOrientation = (info.orientation - degrees + 360) % 360;
    }
    camera.setDisplayOrientation(resultOrientation);
}

****现在修改getFramingRectInPreview()****

if(resultOrientation == 180 || resultOrientation == 0){//to work with landScape and reverse landScape
            rect.left = rect.left * cameraResolution.x / screenResolution.x;
            rect.right = rect.right * cameraResolution.x / screenResolution.x;
            rect.top = rect.top * cameraResolution.y / screenResolution.y;
            rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
        }else{
            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;
        }

并修改此方法public PlanarYUVLuminanceSource buildLuminanceSource(..)

if(resultOrientation == 180 || resultOrientation == 0){//TODO: This is to use camera in landScape mode
        // Go ahead and assume it's YUV rather than die.
        return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
    }else{
        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;
        width = height;
        height = tmp;
        return new PlanarYUVLuminanceSource(rotatedData, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
    }

Answer 3

您可以使用我的zxlib分支https://github.com/rusfearuth/zxing-lib-without-landscape-only.我只禁用了横向模式.您可以设置横向/纵向并查看正确的摄像机视图.