Zxing 竖屏切换 android

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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"

屏幕尽管正了 可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  <Activity  />标签  CaptureActivity 的screenOrientation改动为

android:screenOrientation="portrait"

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

      
      //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之前添加

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);

之前加入:

		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)方法整个替换例如以下

该方法防止竖屏后屏幕拉伸

	/**
	 * 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 横屏就切换为竖屏

不足之处请在下方留言  谢谢 

希望对您实用 

资源下载地址:http://download.csdn.net/detail/aaawqqq/7281577