ZXing库二维码扫描修改

1，设置生成二维码的容错率

原来二维码在生成时并没有设置容错率，事实上我们可以简单的设置一下容错率，只需要在EncodingHandler类中hints.put(EncodeHintType.CHARACTER_SET, "utf-8");代码后 添加一行

hints.put(EncodeHintType.ERROR_CORRECTION, String.valueOf(ErrorCorrectionLevel.H));即可。

2，调整扫描框样式

扫描框的重绘方法在ViewfinderView类中的onDraw()方法中，可以在该方法中修改扫描框的显示形式。

3，调整扫描区域大小

扫描框大小由扫描区域大小限制，getFramingRect()用来获取扫描框的大小，getFramingRectInPreview()用来调整扫描区域的大小，两个方法均在CameraManager类中，getFramingRectInPreview()方法通过调用getFramingRect()来确定扫描区域的大小。

4，聚焦时间

该开源库设置了自动对焦，对焦时长默认1500毫秒，可以在AutoFocusCallback类中修改AUTOFOCUS_INTERVAL_MS参数。

5，聚焦距离

聚焦距离参数可在CameraConfigurationManager类中修改TEN_DESIRED_ZOOM参数。

6，修改切换成竖屏后图像拉伸的问题

在CameraConfigurationManager类中找到initFromCameraParameters()方法，并将一下代码重写

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);

//---修改

Point screenResolutionForCamera = new Point();

screenResolutionForCamera.x = screenResolution.x;

screenResolutionForCamera.y = screenResolution.y;

// preview size is always something like 480320, other 320480

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);