基于zxing实现二维码竖屏扫描

转载请注明出处，http://blog.csdn.net/Bule_Zst/article/details/74450685

在“使用zxing实现二维码的扫描功能”一文中已经完成了基本的扫描功能，但是是横屏的，这篇文章主要介绍了如何修改项目，实现竖屏扫描功能。

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找到CameraConfigurationManager类，类的位置为：com.google.zxing.client.android.camera;

• 替换initFromCameraParameters方法

void initFromCameraParameters(OpenCamera camera) {    Camera.Parameters parameters = camera.getCamera().getParameters();    WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);    Display display = manager.getDefaultDisplay();    Point theScreenResolution = new Point();    display.getSize(theScreenResolution);    screenResolution = theScreenResolution;    Log.i(TAG, "Screen resolution: " + screenResolution);    //修改竖屏显示，解决图形拉伸问题    Point p = new Point();    p.x = this.screenResolution.x;    p.y = this.screenResolution.y;    if (this.screenResolution.x < this.screenResolution.y) {      p.x = this.screenResolution.y;      p.y = this.screenResolution.x;    }    cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, p);    Log.i(TAG, "Camera resolution: " + cameraResolution);  }

• 修改setDesiredCameraParameters方法
  在Camera theCamera = camera.getCamera();后添加代码
  theCamera.setDisplayOrientation( 90 );

替换CameraManager类中的getFramingRectInPreview方法，类的位置：com.google.zxing.client.android.camera;

public synchronized Rect getFramingRectInPreview() {    if (framingRectInPreview == null) {      Rect framingRect = getFramingRect();      if (framingRect == null) {        return null;      }      Rect rect = new Rect(framingRect);      Point cameraResolution = configManager.getCameraResolution();      Point screenResolution = configManager.getScreenResolution();      if (cameraResolution == null || screenResolution == null) {        // Called early, before init even finished        return null;      }      //修改竖屏，扫描框尺寸的变换      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);      framingRectInPreview = rect;    }    return framingRectInPreview;  } 

修改DecodeHandler类中的decode方法，类的位置：com.google.zxing.client.android;

在PlanarYUVLuminanceSource source =
activity.getCameraManager().buildLuminanceSource(data, width, height)之前添加代码

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 temp = width;      width = height;      height = temp;      data = rotatedData;  

将AndroidManifest主配置文件的CaptureActivity显示改为竖屏显示
android:screenOrientation="portrait"
原本是android:screenOrientation="landscape"

在CaptureActivity类中将onResume方法里的下面这段代码注释掉，类的位置：com.google.zxing.client.android;

if (prefs.getBoolean(PreferencesActivity.KEY_DISABLE_AUTO_ORIENTATION, true)) {      setRequestedOrientation(getCurrentOrientation());} else {  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);}resetStatusView();

参考文章，http://blog.csdn.net/rickyfm/article/details/49339473