Extracting information from a scanned GS1-type barcode

Question

I am developing an app on Android Studio to get the expiry date of items upon scanning the barcode.

I don\'t want the user to install ZXing barcode app separately

Answer 1

This is a solution written in Javascript proven in a specific customer, generalization requires more work:

//define AI's, parameter name and, optionally, transformation functions
SapApplicationIdentifiers= [
    { ai: '00', regex: /^00(\d{18})/,         parameter: 'SSCC'},
    { ai: '01', regex: /^01(\d{14})/,         parameter: 'EAN'},
    { ai: '02', regex: /^02(\d{14})/,         parameter: 'EAN'},
    { ai: '10', regex: /^10([^\u001D]{1,20})/,  parameter: 'LOTE'},
    { ai: '13', regex: /^13(\d{6})/},
    { ai: '15', regex: /^15(\d{6})/,        parameter: 'F_CONS', transform: function(match){ return '20'+match[1].substr(0,2)+'-'+match[1].substr(2,2)+'-'+match[1].substr(4,2);}},
    { ai: '17', regex: /^17(\d{6})/,        parameter: 'F_CONS', transform: function(match){ return '20'+match[1].substr(0,2)+'-'+match[1].substr(2,2)+'-'+match[1].substr(4,2);}},
    { ai: '19', regex: /^19(\d{6})/,        parameter: 'F_CONS', transform: function(match){ return '20'+match[1].substr(0,2)+'-'+match[1].substr(2,2)+'-'+match[1].substr(4,2);}},
    { ai: '21', regex: /^21([\d\w]{1,20})/},                       //numero de serie
    { ai: '30', regex: /^30(\d{1,8})/},
    { ai: '310', regex: /^310(\d)(\d{6})/, parameter: 'NTGEW', transform: function(match){ return parseInt( match[2] ) / Math.pow( 10,parseInt( match[1] ) )}},
    { ai: '320', regex: /^320(\d)(\d{6})/, parameter: 'NTGEW', transform: function(match){ return parseInt( match[2] ) / Math.pow( 10,parseInt( match[1] ) )}},
    { ai: '330', regex: /^330(\d)(\d{6})/},
    { ai: '37', regex: /^37(\d{1,8})/,        parameter: 'CANT'}
  ];

 //walks through the code, removing recognized fields
 function parseAiByAi(code, mercancia, onError ){
    var match;

    if(!code)
      return;

    SapApplicationIdentifiers.forEach(function(AI){
      if(code.indexOf(AI.ai)==0 && AI.regex.test(code)){
        match= AI.regex.exec( code );
        if(AI.parameter){
          if(angular.isFunction(AI.transform)){
            mercancia[AI.parameter] = AI.transform(match);
          }else
            mercancia[AI.parameter]= match[1];
          if(AI.parameter=="NTGEW"){
            mercancia.NTGEW_IA= AI.ai;
          }
        }

        code= code.replace(match[0],'').replace(/^[\0\u001D]/,'');
        parseAiByAi(code, mercancia, onError);
      }

    });
  }

  parseAiByAi(code, mercancia, onError);