Adding a QR Code Reader in Flex on Android

浏览数：29 / 时间：2015年06月11日

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<br><br><?xml version="1.0" 
encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
xmlns:mx="library://ns.adobe.com/flex/mx"
      xmlns:s="library://ns.adobe.com/flex/spark" 
title="HomeView">
   <fx:Declarations>
      <!-- Place non-visual elements (e.g., services, value objects) here -->
   </fx:Declarations>
   <fx:Script>
      <![CDATA[
         import 
com.google.zxing.BarcodeFormat;
         import 
com.google.zxing.BinaryBitmap;
         import 
com.google.zxing.BufferedImageLuminanceSource;
         import 
com.google.zxing.DecodeHintType;
         import 
com.google.zxing.Result;
         import 
com.google.zxing.client.result.ParsedResult;
         import 
com.google.zxing.client.result.ResultParser;
         import 
com.google.zxing.common.BitMatrix;
         import 
com.google.zxing.common.ByteMatrix;
         import 
com.google.zxing.common.GlobalHistogramBinarizer;
         import 
com.google.zxing.common.flexdatatypes.HashTable;
         import 
com.google.zxing.qrcode.QRCodeReader;
         import 
com.google.zxing.qrcode.detector.Detector;
          
         import 
spark.events.ViewNavigatorEvent;
          
         protected 
var camera:Camera;
         private 
var videoDisplay:Video=new 
Video(360, 360);
         private 
var qrReader:QRCodeReader;
         private 
var bmd:BitmapData;
         private 
var cameraStarted:Boolean = false;
          
         protected 
function button1_clickHandler(event:MouseEvent):void
         {
            if 
(!cameraStarted) {
               if 
(Camera.isSupported)
               {
                  camera=Camera.getCamera();
                  camera.setMode(360, 360, 24);
                   
                  videoDisplay.x = 360;
                  sv.addChild(videoDisplay);
                   
                  videoDisplay.attachCamera(camera);
                  videoDisplay.rotation=90;
                  qrReader=new 
QRCodeReader;
                  btn.label = "Scan Now";
                  lbl.text = "";
                  cameraStarted = true;
               }
               else 
{
                  lbl.text = "no camera found";
               }
            }
            else 
{
               decodeSnapshot();
            }
         }
          
         public function 
decodeSnapshot():void
         {
            lbl.text="checking...";
            bmd=new 
BitmapData(300, 300);
            bmd.draw(videoDisplay, null, null, null, null, true);
            videoDisplay.cacheAsBitmap=true;
            videoDisplay.cacheAsBitmapMatrix=new 
Matrix;
            decodeBitmapData(bmd, 300, 300);
            bmd.dispose();
            bmd=null;
            System.gc();
         }
          
         public function 
decodeBitmapData(bmpd:BitmapData, width:int, height:int):void
         {
            var 
lsource:BufferedImageLuminanceSource=new 
BufferedImageLuminanceSource(bmpd);
            var 
bitmap:BinaryBitmap=new 
BinaryBitmap(new 
GlobalHistogramBinarizer(lsource));
             
            var 
ht:HashTable=null;
            ht=this.getAllHints();
             
            var 
res:Result=null;
            try 
{
               res=qrReader.decode(bitmap, ht);
            }
            catch 
(event:Error) {
            }
             
            if 
(res == null) {
               videoDisplay.clear();
               lbl.text="nothing decoded";
            }
            else 
{
               var 
parsedResult:ParsedResult=ResultParser.parseResult(res);
               lbl.text=parsedResult.getDisplayResult();
               sv.removeChild(videoDisplay);
               cameraStarted = false;
               btn.label = "Start Camera";
            }
         }
          
         public function 
getAllHints():HashTable
         {
            var 
ht:HashTable=new 
HashTable;
            ht.Add(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);
            return 
ht;
         }
          
      ]]>
   </fx:Script>
   <s:VGroup width="100%" 
horizontalAlign="center" 
id="vg">
      <s:SpriteVisualElement id="sv" 
width="360" 
height="400"/>
      <s:Label id="lbl" 
text="" 
/>
      <s:Button id="btn" 
label="Start Camera" 
width="220" 
height="93" 
click="button1_clickHandler(event)"/>
   </s:VGroup>
</s:View>

public function 
decodeSnapshot():void
{
   lbl.text="checking...";
   bmd=new 
BitmapData(300, 300);
   bmd.draw(videoDisplay, null, null, null, null, true);
   videoDisplay.cacheAsBitmap=true;
   videoDisplay.cacheAsBitmapMatrix=new 
Matrix;
   decodeBitmapData(bmd, 300, 300);
   bmd.dispose();
   bmd=null;
   System.gc();
}
          
public function 
decodeBitmapData(bmpd:BitmapData, width:int, height:int):void
{
   var 
lsource:BufferedImageLuminanceSource=new 
BufferedImageLuminanceSource(bmpd);
   var 
bitmap:BinaryBitmap=new 
BinaryBitmap(new 
GlobalHistogramBinarizer(lsource));
 
   var 
ht:HashTable=null;
   ht=this.getAllHints();
             
   var 
res:Result=null;
   try 
{
      res=qrReader.decode(bitmap, ht);
   }
   catch 
(event:Error) {
   }
             
   if 
(res == null) {
      videoDisplay.clear();
      lbl.text="nothing decoded";
   }
   else 
{
      var 
parsedResult:ParsedResult=ResultParser.parseResult(res);
      lbl.text=parsedResult.getDisplayResult();
      sv.removeChild(videoDisplay);
      cameraStarted = false;
      btn.label = "Start Camera";
   }
}
          
public function 
getAllHints():HashTable
{
   var 
ht:HashTable=new 
HashTable;
   ht.Add(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);
   return 
ht;
}

if 
(Camera.isSupported)
{
   camera=Camera.getCamera();
   camera.setMode(360, 360, 24);
                   
   videoDisplay.x = 360;
   sv.addChild(videoDisplay);
    
   videoDisplay.attachCamera(camera);
   videoDisplay.rotation=90;
   qrReader=new 
QRCodeReader;
   btn.label = "Scan Now";
   lbl.text = "";
   cameraStarted = true;
}
else 
{
   lbl.text = "no camera found";
}