Vi que alguem tem o mesmo problema, vou já colocar o codigo que fiz todos passos do exercicios com exatidão..e testei no meu proprio celular moto x Play android 6.0.1
<?xml version='1.0' encoding='utf-8'?>
<widget id="org.andrejrocha.garconapp" version="0.0.1" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
<name>Garçonete Só de Cenoura</name>
<description>
App para uso das Garçonetes dentro do restaurante
</description>
<author email="qualquer@andrejrocha.org.co" href="http://andrejrocha.org.com">
Andre
</author>
<preference name="Orientation" value="portrait" />
<preference name="Fullscreen" value="false" />
<preference name="DisallowOverscroll" value="true" />
<preference name="BackgroundColor" value="0xF2F2f2FF" />
<preference name="SplashScreen" value="screen" />
<preference name="SplashScreenDelay" value="3000" />
<platform name="android">
<icon density="ldpi" src="resources\android\icon\drawable-ldpi-icon.png" />
<icon density="mdpi" src="resources\android\icon\drawable-mdpi-icon.png" />
<icon density="hdpi" src="resources\android\icon\drawable-hdpi-icon.png" />
<icon density="xhdpi" src="resources\android\icon\drawable-xhdpi-icon.png" />
<icon density="xxhdpi" src="resources\android\icon\drawable-xxhdpi-icon.png" />
<icon density="xxxhdpi" src="resources\android\icon\drawable-xxxhdpi-icon.png" />
<splash density="port-ldpi" src="resources\android\splash\drawable-port-ldpi-screen.png" />
<splash density="port-mdpi" src="resources\android\splash\drawable-port-mdpi-screen.png" />
<splash density="port-hdpi" src="resources\android\splash\drawable-port-hdpi-screen.png" />
<splash density="port-xhdpi" src="resources\android\splash\drawable-port-xhdpi-screen.png" />
<splash density="port-xxhdpi" src="resources\android\splash\drawable-port-xxhdpi-screen.png" />
<splash density="port-xxxhdpi" src="resources\android\splash\drawable-port-xxxhdpi-screen.png" />
</platform>
<icon src="resources\android\icon\drawable-xhdpi-icon.png" />
<plugin name="cordova-plugin-statusbar" spec="~2.1.3" />
<platform name="android">
<preference name="StatusBarBackgroundColor" value="#E86C13" />
</platform>
<plugin name="phonegap-plugin-barcodescanner" spec="~5.0.0" />
</widget>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="utf-8">
<title>Só de Cenoura Garçom</title>
<link rel="stylesheet" href="icons/material.css">
<link rel="stylesheet" href="css/materialize.min.css">
<link rel="stylesheet" type="text/css" href="css/estilos.css">
</head>
<body>
<div class="topo-fixo z-depth-1">
<div class="yellow darken-4 white-text valign-wrapper">
<h5 class="titulo">Só de Cenoura</h5>
<div>
<i class="material-icons waves-effect waves-light waves-circle scan-qrcode">camera</i>
<i data-activates="submenu" data-gutter="5" data-contrainwidth="false"
class="material-icons waves-effect waves-light waves-circle dropdown-button">more_vert</i>
</div>
<ul class="dropdown-content" id="submenu">
<li> <a class="black-text acao-limpar">Limpar</a></li>
</ul>
</div>
<ul class="tabs">
<li class="tab yellow darken-4"><a href="#bolos" class="white-text waves-effect waves-light">Bolos</a></li>
<li class="tab yellow darken-4"><a href="#bebidas" class="white-text waves-effect waves-light">Bebidas</a></li>
</ul>
</div>
<div class="section" id="bolos">
<h6 class="container brown-text">Em pedaços</h6>
<div class="collection">
<a class="collection-item waves-effect black-text">Só de Cenoura</a>
<a class="collection-item waves-effect black-text">Com Nutella</a>
<a class="collection-item waves-effect black-text">De Brigadeiro</a>
<a class="collection-item waves-effect black-text">Acucarado</a>
</div>
<h6 class="container brown-text">Inteiro</h6>
<div class="collection">
<a class="collection-item waves-effect black-text">Só de Cenoura Inteiro</a>
<a class="collection-item waves-effect black-text">Com Nutella Inteiro</a>
<a class="collection-item waves-effect black-text">De Brigadeiro Inteiro</a>
<a class="collection-item waves-effect black-text">Acucarado Inteiro</a>
</div>
</div>
<div class="section" id="bebidas">
<h6 class="container brown-text">Cafés</h6>
<div class="collection">
<a class="collection-item waves-effect black-text">Expresso</a>
<a class="collection-item waves-effect black-text">Cappucino</a>
<a class="collection-item waves-effect black-text">Mochattino</a>
</div>
<h6 class="container brown-text">Refrigerantes</h6>
<div class="collection">
<a class="collection-item waves-effect black-text">Coca</a>
<a class="collection-item waves-effect black-text">Soda</a>
<a class="collection-item waves-effect black-text">Guaraná</a>
</div>
</div>
<div class="fixed-action-btn">
<a href="#confirmacao" id="confirmar"
class="btn-floating btn-large waves-effect
waves-light red modal-trigger">
<i class="material-icons">done</i>
</a>
</div>
<div class="modal modal-fixed-footer" id="confirmacao">
<div class="modal-content">
<h5>Resumo do pedido</h5>
<input type="number" placeholder="Número da Mesa" class="validate" id="numero-mesa" />
<blockquote id="resumo"></blockquote>
</div>
<div class="modal-footer">
<button class="btn deep-orange waves-effect waves-light modal-close">
Pedir
</button>
<button class="acao-limpar btn-flat waves-effect waves-red modal-close">
Cancelar
</button>
</div>
</div>
<script src="cordova.js"></script>
<script src="js/jquery.min.js"></script>
<script src="js/materialize.min.js"></script>
<script src="js/app.js"></script>
</body>
</html>