Scan barcodes and QR codes using zxing

Mainly introduces the use of Zxing Library for barcode and QR code scanning

The library used in this post is someone else's streamlined

In the code comment inside the author- Ryan.tang

Here is the main introduction about the scanning interface

Here's a description of the properties

Scanview Core Source Code Analysis

Scanview Custom Properties

<declare-styleable name= "Scanview" > <!--Specify the background image of the scan area--<attr name= "Scanbackground" format= "re Ference "/> <!--Specify the size of the scan area--<attr name=" Scanwidth "format=" Dimension "/> <attr nam E= "Scanheight" format= "Dimension"/> <!--specify colors around the scan area--<attr name= "Aroundcolor" format= "Color" /> <!--the distance to the top of the scan area--<attr name= "scantopdistance" format= "Dimension"/> <!--scanning mode--            > <attr name= "Scanmode" format= "enum" > <enum name= "None" value= "0"/><!--nothing. <enum name= "line" value= "1"/><!--with scan cable--<enum name= "point" value= "2"/><!--flashing        --<enum Name= "both" value= "3"/><!--All--</attr> <!--the height of the scan line-- <attr name= "Lineheight" format= "Dimension"/> <!--scan Line Color--<attr name= "LineColor" format = "Color"/> &Lt;! --Border Width--<attr name= "frameborder" format= "Dimension"/> <!--border Color--<attr Name= "fr        Amecolor "format=" Color "/> <!--Specify a picture of the scan line--<attr name=" linesrc "format=" Reference "/> <!--Specify the color of the flicker point--<attr name= "Pointcolor" format= "Color"/> <!--scan mode state--<attr N Ame= "Scanstatus" format= "enum" > <enum name= "Slow" value= "1"/><!--slow-to-<enum name=         "Normal" value= "0"/><!--Normal--<enum name= "Fast" value= "2"/><!--fast--</attr> <!--scan line scrolling mode--<attr name= "Linescrollmode" format= "enum" > <enum name= "Repeat" va Lue= "0"/><!--repeat--<enum name= "cycle" value= "1"/><!--Cycle---</attr> & lt;! --Scan timeout--<attr name= "Scantimevalue" format= "integer"/> <!--scan time units support seconds--<a TTR name= "ScantimEunit "format=" enum "> <enum name=" Second "value=" 0 "/> <enum name=" Minute "value=" 1 "/&G        T </attr> </declare-styleable>

Draw around the scanning area

Divided into whether to set the background picture two kinds of situation

private void Drawaround (canvas canvas) {if (MSCANBG = = null) {canvas.drawrect (0, 0, screenwidth, scant            Opdistance-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 {//Draw peripheral 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); }    }

Draw Scan Area

is divided into whether to set the background picture if you do not set a background picture to draw a box according to the specified size or default size

private void Drawscanarea (canvas canvas) {        //Draw scan Area        if (MSCANBG = = null) {//no background picture set using default box            mpaintshape.se Tstyle (Paint.Style.STROKE);            Mpaintshape.setstrokewidth (frameborder);            Mpaintshape.setcolor (FrameColor);  draw a border            canvas.drawrect (Scanhorizontaldsitance-frameborder,                    Scantopdistance-frameborder,                    Scanhorizontaldsitance + scanwidth + frameborder,                    scantopdistance + scanheight + frameborder, mPaintShape);        } else {//Set background            canvas.drawbitmap (MSCANBG, Scanhorizontaldsitance, Scantopdistance, Mpaintbitmap);        }    }

Draw scan Lines

    private void DrawLine (canvas canvas) {if (mscanline! = null) {Canvas.drawbitmap (Mscanline, Scanhorizontaldsitance + (Scanwidth-mscanline.getwidth ())/2, Linepositionheight, Mpaint        BITMAP);            } else {Mpaintshape.setstyle (Paint.Style.FILL);            Mpaintshape.setcolor (LineColor); Canvas.drawline (Scanhorizontaldsitance, linepositionheight, Scanhorizontaldsitance + scanWidth, LinePos        Itionheight + lineheight, mpaintshape); } switch (linesrollmode) {case line_scroll_mode_repeat:if (Linepositionheight > Scan                Topdistance + 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 }    }

The drawLine can achieve the same effect as a UC sweep by controlling the height of the rectangle.

Add the following code

Mpaintshape.setcolor (Color.parsecolor ("#4455ff55"));        Canvas.drawrect (scanhorizontaldsitance,                scantopdistance,                scanhorizontaldsitance + scanwidth,                Linepositionheight, Mpaintshape);

Draw a flashing point

    private void Drawpoint (canvas canvas) {if (Currentpoints.isempty ()) {lastpoints = null;            } else {//records the current data to the previous position set in lastpoints = Currentpoints;            Sets the brush Mpaintshape.setalpha (0xff) that draws the blinking point;            Mpaintshape.setcolor (Pointcolor);            Mpaintshape.setstyle (Paint.Style.FILL); Loop draw for (Resultpoint point:currentpoints) {//Draw flash point canvas.drawcircle (scan            Horizontaldsitance + point.getx (), Scantopdistance + point.gety (), 6.0f, Mpaintshape);            }} if (lastpoints! = null) {//sets the Brush Mpaintshape.setalpha (0XFF/2) that draws the blinking point;            Mpaintshape.setcolor (Pointcolor);            Mpaintshape.setstyle (Paint.Style.FILL); Loop draw for (Resultpoint point:lastpoints) {//Draw Flicker Point canvas.drawcircle (scanhor                Izontaldsitance + point.getx (),        Scantopdistance + point.gety (), 3.0f, Mpaintshape);    }}//Empty This data currentpoints.clear (); }

Data source for flashing points

This method is automatically called internally

public void Addpossibleresultpoint (Resultpoint point) {        //  adds the dot to the collection        Currentpoints.add (points);    }

Jump captureactivity when in use

Full library file

Go through it.

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Scan barcodes and QR codes using zxing