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主要是介绍使用ZXing库进行条形码和二维码的扫描
本帖里面使用的库是别人精简以后的
在代码注释里面作者 - Ryan.Tang
这里主要是介绍一下关于扫描界面
下面是关于属性的介绍
ScanView核心源码解析
ScanView 自定义属性
<declare-styleable name="ScanView">
<!--指定扫描区域的背景图片-->
<attr name="scanBackground" format="reference" />
<!--指定扫描区域的尺寸-->
<attr name="scanWidth" format="dimension" />
<attr name="scanHeight" format="dimension" />
<!--指定扫描区域周围的颜色-->
<attr name="aroundColor" format="color" />
<!--扫描区域到顶部的距离-->
<attr name="scanTopDistance" format="dimension" />
<!--扫描的模式-->
<attr name="scanMode" format="enum">
<enum name="none" value="0" /><!--什么都没有-->
<enum name="line" value="1" /><!--有扫描线-->
<enum name="point" value="2" /><!--有闪烁点-->
<enum name="both" value="3" /><!--都有-->
</attr>
<!--扫描线的高度-->
<attr name="lineHeight" format="dimension" />
<!--扫描线的颜色-->
<attr name="lineColor" format="color" />
<!--边框宽度-->
<attr name="frameBorder" format="dimension" />
<!--边框颜色-->
<attr name="frameColor" format="color" />
<!--指定扫描线的图片-->
<attr name="lineSrc" format="reference" />
<!--指定闪烁点的颜色-->
<attr name="pointColor" format="color" />
<!--扫描模式状态-->
<attr name="scanStatus" format="enum">
<enum name="slow" value="1" /><!--慢-->
<enum name="normal" value="0" /><!--正常-->
<enum name="fast" value="2" /><!--快-->
</attr>
<!--扫描线的滚动模式-->
<attr name="lineScrollMode" format="enum">
<enum name="repeat" value="0" /><!--重复-->
<enum name="cycle" value="1" /><!--循环-->
</attr>
<!--扫描超时时间-->
<attr name="scanTimeValue" format="integer" />
<!--扫描时间单位 支持 秒 分钟-->
<attr name="scanTimeUnit" format="enum">
<enum name="second" value="0" />
<enum name="minute" value="1" />
</attr>
</declare-styleable>绘制 扫描区域 周围
分为 是否设置背景图片俩种情况
private void drawAround(Canvas canvas) {
if (mScanBg == null) {
canvas.drawRect(0, 0, screenWidth, scanTopDistance - frameBorder, mPaintShape);
canvas.drawRect(0, scanTopDistance - frameBorder, scanHorizontalDsitance - frameBorder,
scanTopDistance + scanHeight + frameBorder, mPaintShape);
canvas.drawRect(scanHorizontalDsitance + scanWidth + frameBorder, scanTopDistance - frameBorder, screenWidth,
scanTopDistance + scanHeight + frameBorder, mPaintShape);
canvas.drawRect(0, scanTopDistance + scanHeight + frameBorder, screenWidth, screenHeight, mPaintShape);
} else {
// 绘制周边
canvas.drawRect(0, 0, screenWidth, scanTopDistance, mPaintShape);
canvas.drawRect(0, scanTopDistance, scanHorizontalDsitance,
scanTopDistance + scanHeight, mPaintShape);
canvas.drawRect(scanHorizontalDsitance + scanWidth, scanTopDistance, screenWidth,
scanTopDistance + scanHeight, mPaintShape);
canvas.drawRect(0, scanTopDistance + scanHeight, screenWidth, screenHeight, mPaintShape);
}
}绘制 扫描区域
分为 是否设置背景图片 如果没有设置背景图片 则根据指定大小或者是默认大小绘制一个方框
private void drawScanArea(Canvas canvas) {
// 绘制扫描区域
if (mScanBg == null) { // 没有设置背景图片使用默认的方框
mPaintShape.setStyle(Paint.Style.STROKE);
mPaintShape.setStrokeWidth(frameBorder);
mPaintShape.setColor(frameColor);
// 画一个边框
canvas.drawRect(scanHorizontalDsitance - frameBorder,
scanTopDistance - frameBorder,
scanHorizontalDsitance + scanWidth + frameBorder,
scanTopDistance + scanHeight + frameBorder, mPaintShape);
} else { // 设置背景
canvas.drawBitmap(mScanBg, scanHorizontalDsitance, scanTopDistance, mPaintBitmap);
}
}绘制扫描线 private void drawLine(Canvas canvas) {
if (mScanLine != null) {
canvas.drawBitmap(mScanLine,
scanHorizontalDsitance + (scanWidth - mScanLine.getWidth()) / 2,
linePositionHeight, mPaintBitmap);
} else {
mPaintShape.setStyle(Paint.Style.FILL);
mPaintShape.setColor(lineColor);
canvas.drawLine(scanHorizontalDsitance, linePositionHeight,
scanHorizontalDsitance + scanWidth, linePositionHeight + lineHeight, mPaintShape);
}
switch (lineSrollMode) {
case LINE_SCROLL_MODE_REPEAT:
if (linePositionHeight > scanTopDistance + scanHeight)
linePositionHeight = scanTopDistance;
linePositionHeight += lineMoveSpeed;
break;
case LINE_SCROLL_MODE_CYCLE:
if (!upFlag) {
linePositionHeight += lineMoveSpeed;
} else {
linePositionHeight -= lineMoveSpeed;
}
if (linePositionHeight > scanTopDistance + scanHeight)
upFlag = true;
if (linePositionHeight < scanTopDistance)
upFlag = false;
break;
}
}
在 drawLine 通过控制可以矩形的高度可以实现和UC 扫一扫一样的效果
添加如下代码
mPaintShape.setColor(Color.parseColor("#4455ff55"));
canvas.drawRect(scanHorizontalDsitance,
scanTopDistance,
scanHorizontalDsitance + scanWidth,
linePositionHeight, mPaintShape);
绘制闪烁点
private void drawPoint(Canvas canvas) {
if (currentPoints.isEmpty()) {
lastPoints = null;
} else {
// 记录当前的数据到上一次位置集合中
lastPoints = currentPoints;
// 设置绘制闪烁点的画笔
mPaintShape.setAlpha(0xff);
mPaintShape.setColor(pointColor);
mPaintShape.setStyle(Paint.Style.FILL);
// 循环绘制
for (ResultPoint point : currentPoints) {
// 绘制闪烁点
canvas.drawCircle(scanHorizontalDsitance + point.getX(),
scanTopDistance + point.getY(), 6.0f, mPaintShape);
}
}
if (lastPoints != null) {
// 设置绘制闪烁点的画笔
mPaintShape.setAlpha(0xff / 2);
mPaintShape.setColor(pointColor);
mPaintShape.setStyle(Paint.Style.FILL);
// 循环绘制
for (ResultPoint point : lastPoints) {
// 绘制闪烁点
canvas.drawCircle(scanHorizontalDsitance + point.getX(),
scanTopDistance + point.getY(), 3.0f, mPaintShape);
}
}
// 清空本次数据
currentPoints.clear();
}闪烁点的数据来源
这个方法内部自动调用
public void addPossibleResultPoint(ResultPoint point) {
// 添加该点到集合中
currentPoints.add(point);
}
完整库文件下载地址
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原文地址：http://blog.csdn.net/it_transformers/article/details/47294537
