Zxing 豎屏切換 Android

Zxing 豎屏切換  Android

在google上下載的ZxingDemo 為橫屏狀態 

我簡單的在Androidmanifest.xml把Activity換成豎屏android:screenOrientation="portrait"
 
屏幕雖然正了 但是屏幕上顯示的拍攝畫面還是橫著的 

查了一些網上的資料  結合自己手工調試 

在這裡總結分享一下
 
步驟:
 
1)  在AndroidManifest.xml中把  <Activity  />標簽  CaptureActivity 的screenOrientation修改為

android:screenOrientation="portrait"

2)  在CameraManager.java類中的getFramingRectInPreview()替換掉原先的 left right top bottom

     
      //豎屏
      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

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:

  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)  將CameraConfigurationManager的  initFromCameraParameters(Camera camera)方法整個替換如下
 
該方法防止豎屏後屏幕拉伸

 /**
  * 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);
//  cameraResolution = getCameraResolution(parameters, screenResolution);
  Log.d(TAG, "Camera resolution: " + screenResolution);
 }

至此Zxing 橫屏就切換為豎屏
 
不足之處請在下方留言  謝謝
 
希望對您有用
 
資源下載地址見 http://www.linuxidc.com/Linux/2014-05/101115.htm

更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11