Android Zxing调整扫描区域 提高取图速度
在CameraManager.java这个类中进行调整
默认的大小是 以下这4个参数
// private static final int MIN_FRAME_WIDTH = 240;
// private static final int MIN_FRAME_HEIGHT = 240;
// private static final int MAX_FRAME_WIDTH = 480;
// private static final int MAX_FRAME_HEIGHT = 360;
根据屏幕大小调整 大家可以增大这些数值 : 最小的宽 高 ; 最大宽高
参数实际在 getFramingRect() 方法中起作用
以下是原本Demo中提供的
/**
* Calculates the framing rect which the UI should draw to show the user where to place the
* barcode. This target helps with alignment as well as forces the user to hold the device
* far enough away to ensure the image will be in focus.
*
* @return The rectangle to draw on screen in window coordinates.
*/
public Rect getFramingRect() {
Point screenResolution = configManager.getScreenResolution();
if (framingRect == null) {
if (camera == null) {
return null;
}
//原生
int width = screenResolution.x * 3 / 4;
if (width < MIN_FRAME_WIDTH) {
width = MIN_FRAME_WIDTH;
} else if (width > MAX_FRAME_WIDTH) {
width = MAX_FRAME_WIDTH;
}
int height = screenResolution.y * 3 / 4;
if (height < MIN_FRAME_HEIGHT) {
height = MIN_FRAME_HEIGHT;
} else if (height > MAX_FRAME_HEIGHT) {
height = MAX_FRAME_HEIGHT;
}
int leftOffset = (screenResolution.x - width) / 2;
int topOffset = (screenResolution.y - height) / 2;
framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
Log.d(TAG, "Calculated framing rect: " + framingRect);
}
return framingRect;
}
我为了适配不同的屏幕大小将代码改成了
public Rect getFramingRect() {
Point screenResolution = configManager.getScreenResolution();
if (framingRect == null) {
if (camera == null) {
return null;
}
//修改之后
int width = screenResolution.x * 7 / 10;
int height = screenResolution.y * 7 / 10;
int leftOffset = (screenResolution.x - width) / 2;
int topOffset = (screenResolution.y - height) / 3;
framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
Log.d(TAG, "Calculated framing rect: " + framingRect);
}
return framingRect;
}