实现android端的类似二维码的扫描窗口（中间亮，四周暗，扫描线循环）

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实现android端的类似二维码的扫描窗口（中间亮，四周暗，扫描线循环），效果图：

要实现android端的类似二维码的扫描窗口（中间亮，四周暗，扫描线循环）

主要用到paint类，drawRect()以及drawLine()函数，参数分别是左上点x,左下点y，右上点x,右下点y，画布paint

drawRect(float left, float top, float right, float bottom, Paint paint)
drawLine(float startX, float startY, float stopX, float stopY, Paint paint)

主要流程是：首先，新建一个类继承于ImageView类，重写onDraw函数。
使用用法：在你需要的.xml布局文件添加上该类
例如: 新建的扫描窗口类为cameraWindows，在activity_camera.xml上添加该类：
<com.hongh.camera.cameraWindows
android:scaleType="fitXY"
android:adjustViewBounds="true"
android:layout_width="match_parent"

android:layout_height="match_parent"/>

部分核心代码：

            //设置三个Paint画布，分别用于画阴影矩形，蓝色矩形（四个角），蓝色直线（扫描线）</span>

        private Paint mAreaPaint,paint,paint2;

        mAreaPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        paint = new Paint();

        paint2 = new Paint();

        mAreaPaint.setColor(Color.BLACK);        mAreaPaint.setStyle(Paint.Style.FILL);        mAreaPaint.setAlpha(110);//设置画布为蓝色，用于设置扫描窗口边缘的四个角        paint.setColor(Color.BLUE);        paint.setStyle(Paint.Style.STROKE);        paint.setStrokeWidth(7f);//设置画布为蓝色，用于设置扫描线        paint2.setColor(Color.BLUE);        paint2.setStrokeWidth(2f);

        <p><span style="font-size: 18px;">        //参数分别是左上点x,左下点y，右上点x,右下点y，画布paint</span></p><span style="font-size: 18px;">        //drawRect(float left, float top, float right, float bottom, Paint paint)</span>        /***画阴影部分的矩形框****/        canvas.drawRect(0,0,screenWidth,(screenHeight - Y)/2,mAreaPaint);        canvas.drawRect(0,(screenHeight - Y)/2,(screenWidth-X)/2,screenHeight,mAreaPaint);        canvas.drawRect((screenWidth-X)/2+X,(screenHeight - Y)/2,screenWidth,screenHeight,mAreaPaint);        canvas.drawRect((screenWidth-X)/2,(screenHeight - Y)/2+Y,(screenWidth-X)/2+X,screenHeight,mAreaPaint);        /***四个角***/        canvas.drawLine((screenWidth-X)/2,(screenHeight - Y)/2,(screenWidth-X)/2+XX,(screenHeight - Y)/2,paint);        canvas.drawLine((screenWidth-X)/2,(screenHeight - Y)/2,(screenWidth-X)/2,(screenHeight - Y)/2+XX,paint);        canvas.drawLine((screenWidth-X)/2+X-XX,(screenHeight - Y)/2,(screenWidth-X)/2+X,(screenHeight - Y)/2,paint);        canvas.drawLine((screenWidth-X)/2+X,(screenHeight - Y)/2,(screenWidth-X)/2+X,(screenHeight - Y)/2+XX,paint);        canvas.drawLine((screenWidth-X)/2,(screenHeight - Y)/2+Y-XX,(screenWidth-X)/2,(screenHeight - Y)/2+Y,paint);        canvas.drawLine((screenWidth-X)/2,(screenHeight - Y)/2+Y,(screenWidth-X)/2+XX,(screenHeight - Y)/2+Y,paint);        canvas.drawLine((screenWidth-X)/2+X,(screenHeight - Y)/2+Y-XX,(screenWidth-X)/2+X,(screenHeight - Y)/2+Y,paint);        canvas.drawLine((screenWidth-X)/2+X-XX,(screenHeight - Y)/2+Y,(screenWidth-X)/2+X,(screenHeight - Y)/2+Y,paint);        /*******扫描线*********/        if(count >Y-20)            count = 0;        canvas.drawLine((screenWidth-X)/2+20,(screenHeight - Y)/2+10+count,(screenWidth-X)/2+X-20,(screenHeight - Y)/2+10+count,paint2);        count+=2;        invalidate();  //刷新canvas，目的是更新扫描线

源码下载：

http://download.csdn.net/detail/chenmohousuiyue/9643338

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