Emi*_*ily 6 javascript android node.js cordova
我在第一个Cordova项目中无法获得任何形式的交互性。我具有HTML,Javascript和CSS的经验,因此我认为Cordova是混合应用程序开发的完美入门,但是我似乎连一个基本的HTML按钮都无法在该应用程序上使用。
我正在使用Windows 10并安装了Android Studio和Cordova。我想我已经正确设置了项目文件结构。我一直在关注Cordova的文档,并已在所有设备类型上安装了geolocation插件。为了进行测试,我同时使用了Android Studio中的虚拟android设备和android手机(OnePlus X),它已正确连接(只要我在控制台中键入“ cordova run android”,该应用程序就会在手机上打开)。
我开始尝试获取当前位置,然后将坐标显示为警报。这是行不通的,因此,为了尝试更简单的操作,我添加了一个按钮,单击该按钮时应显示警报弹出窗口,但均不起作用。这是我当前的代码:
www / index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
<title>Hello World</title>
</head>
<body>
<div class="app">
<h1 id="headertext">My first Cordova App!</h1>
<div id="deviceready" class="blink">
<p class="event listening">Connecting to Device</p>
<p class="event received" id="geolocation">Device is ready!</p>
</div>
<br>
<div>
<button type="button" onclick="basicAlertTest();">Click Me!</button>
</div>
</div>
<script type="text/javascript" charset="utf-8">
// onSuccess Callback
// current GPS coordinates
var onSuccess = function(position) {
alert('Latitude: ' + position.coords.latitude + '\n' +
'Longitude: ' + position.coords.longitude + '\n' +
'Altitude: ' + position.coords.altitude + '\n' +
'Accuracy: ' + position.coords.accuracy + '\n' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '\n' +
'Heading: ' + position.coords.heading + '\n' +
'Speed: ' + position.coords.speed + '\n' +
'Timestamp: ' + position.timestamp + '\n');
};
// onError Callback receives a PositionError object
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
// Listening for the device to be ready
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
console.log("navigator.geolocation should be able to run successfully now...");
navigator.geolocation.getCurrentPosition(onSuccess, onError);
}
// Checking to see if a basic alert will appear on click of "Click me!" button
function basicAlertTest(){
alert("This is the alert test, button works!");
}
</script>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</body>
</html>
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我缺少一些基本的东西吗?我以为我可以正常使用HTML / Javascript / CSS进行编码,但是我需要学习一些代码行以集成使用本机设备功能(例如地理位置或摄像头)的插件。我已经确保安装了Geolocation插件(使用cordova plugin add cordova-plugin-geolocation),但没有出现警告。我是否需要一个单独的插件来显示警报/与屏幕互动?
另外,我注意到,每当进行虚拟测试时,如果查看“扩展控件”中的位置,则给出的坐标为:
Longitude: -122.0840
Latitude: 37.4220
Altitude: 0.0
距我约8,000英里的加利福尼亚山景城(_(?)_ /¯
这是屏幕截图:
我正在本地进行测试,这有什么不同吗?我真的很感谢在此方面的任何帮助或建议,我可能会缺少一些非常明显的东西。先感谢您!
更新1 从“ cordova plugin ls”返回的已安装插件的列表:
cordova-plugin-compat 1.0.0 "Compat"
cordova-plugin-dialogs 1.3.0 "Notification"
cordova-plugin-geolocation 2.4.0 "Geolocation"
cordova-plugin-whitelist 1.3.0 "Whitelist"
更新2
该onSuccess功能应该在设备准备就绪后运行。当它运行时,它应该显示一个包含位置详细信息的警报,但是由于我收到的“设备就绪”消息没有出现警报,因此我决定添加一个按钮来手动调用该函数。
我现在确定onSuccess设备准备就绪后无法正常运行,因为每当我单击按钮使其手动运行时,控制台中都会显示以下错误:
Uncaught TypeError: Cannot read property 'coords' of undefined
我很困惑,因为我使用的是如下所示的相同代码:https : //cordova.apache.org/docs/en/latest/reference/cordova-plugin-geolocation/index.html
另外,我注意到正在处理的索引模板包含<script type="text/javascript" src="cordova.js"></script>,但是当我查看包含索引文件的文件夹时,没有cordova.js文件,该文件不在该文件夹中,而且我似乎找不到在cordova下载中,这是正常现象还是需要单独下载?
最新尝试:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src * gap://ready file:; style-src 'self' 'unsafe-inline' *; script-src 'self' 'unsafe-inline' 'unsafe-eval' *; img-src * data: 'unsafe-inline'">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
<title>Hello World</title>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</head>
<body>
<div class="app">
<h1 id="headertext">My first Cordova App!</h1>
<div id="deviceready" class="blink">
<p class="event listening">Connecting to Device</p>
<p class="event received" id="geolocation">Device is ready!</p>
</div>
<br>
<div>
<button type="button" onclick="basicAlertTest();">Click Me!</button>
<button type="button" onclick="onSuccess();">Run onSuccess function</button>
</div>
</div>
<script type="text/javascript" charset="utf-8">
// onSuccess Callback
// current GPS coordinates
var onSuccess = function(position) {
alert('Latitude: ' + position.coords.latitude + '\n' +
'Longitude: ' + position.coords.longitude + '\n' +
'Altitude: ' + position.coords.altitude + '\n' +
'Accuracy: ' + position.coords.accuracy + '\n' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '\n' +
'Heading: ' + position.coords.heading + '\n' +
'Speed: ' + position.coords.speed + '\n' +
'Timestamp: ' + position.timestamp + '\n');
};
// onError Callback receives a PositionError object
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
// Listening for the device to be ready
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
console.log("navigator.geolocation should be able to run successfully now...");
navigator.geolocation.getCurrentPosition(onSuccess, onError);
}
// Checking to see if a basic alert will appear on click of "Click me!" button
function basicAlertTest(){
console.log("This is the alert test, button works!");
alert("This is the alert test, button works!");
}
</script>
</body>
</html>
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小智 6
删除index.html文件顶部的这一行
<meta http-equiv="Content-Security-Policy" content="default-src * gap: ws: https://ssl.gstatic.com;style-src * 'unsafe-inline' 'self' data: blob:;script-src * 'unsafe-inline' 'unsafe-eval' data: blob:;img-src * data: 'unsafe-inline' 'self' content:;fmedia-src mediastream;">
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添加额外条件来检查您的应用程序上是否正确安装了地理定位插件。所以,它会像,
if(navigator.geolocation){
console.log('Geolocation is there');
navigator.geolocation.getCurrentPosition(function(position) {
alert('Latitude: ' + position.coords.latitude + '\n' +
'Longitude: ' + position.coords.longitude + '\n' +
'Altitude: ' + position.coords.altitude + '\n' +
'Accuracy: ' + position.coords.accuracy + '\n' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '\n' +
'Heading: ' + position.coords.heading + '\n' +
'Speed: ' + position.coords.speed + '\n' +
'Timestamp: ' + position.timestamp + '\n');
} , function(error) {
console.log('Error while connecting to geolocation ' + error);
}, {timeout:10000});
} else {
console.log('Geolocation is not there');
}
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