phonegap：如何检查是否启用gps [英] phonegap: how to check if gps is enabled
问题描述
我如何使用phonegap获取GPS状态？
我使用了以下代码，但如果GPS关闭，我不会收到任何提醒消息。
<！DOCTYPE html>
< html>
< head>
< title>设备属性示例< / title>
< script type =text / javascriptcharset =utf-8src =cordova.js>< / script>
< script type =text / javascriptcharset =utf-8>
//等待设备API库加载
//
document.addEventListener（deviceready，onDeviceReady，false）;
//设备API可用
//
函数onDeviceReady（）{
var test = navigator.geolocation.getCurrentPosition（onSuccess，onError） ;
// onSuccess地理位置
//
函数onSuccess（位置）{
var element = document.getElementById（'geolocation ）;
element.innerHTML ='Latitude：'+ position.coords.latitude +'< br />'+
'经度：'+ position.coords.longitude +'< br /> '+
'高度：'+ position.coords.altitude +'< br />'+
'准确度：'+ position.coords.accuracy +'< br />'+
'高度准确度：'+ position.coords.altitudeAccuracy +'< br />'+
'标题：'+ position.coords.heading +'< br />'+
'速度：'+ position.coords.speed +'< br />'+
'时间戳：'+ position.timestamp +'< br />';
}
// onError回调接收到一个PositionError对象
//
function onError（error）{
alert（'code：'+ error。 code +'\\\
'+
'message：'+ error.message +'\\\
'）;
}
< / script>
< / head>
< body>
< p id =geolocation>寻找地理位置...< / p>
< / body>
< / html>
假设我们只谈论Android平台，正如 @Joerg 所说的那样，您可以使用 cordova.plugins.diagnostic 来检查GPS是否使用 isGpsLocationEnabled（） ：
cordova.plugins.diagnostic.isGpsLocationEnabled（function（enabled）{
console.log（GPS location is+（enabled？enabled：disabled））;
}，function（错误）{
console.error（发生以下错误：+错误）;
}）;
如果结果是关闭了GPS，您可以将用户切换到位置设置页面手动启用GPS：
cordova.plugins.diagnostic.switchToLocationSettings（）;
另外，您可以使用 cordova-plugin-request-location-accuracy 直接从应用程序请求高精度定位模式（即GPS）。这将显示一个本地确认对话框，如果用户同意，GPS将自动启用：
函数onRequestSuccess（成功）{
console.log（成功请求准确性：+ success.message）;
$ b $ function onRequestFailure（error）{
console.error（Accuracy request failed：error code =+ error.code +; error message =+ error.message ）;
if（error.code！== cordova.plugins.locationAccuracy.ERROR_USER_DISAGREED）{
if（window.confirm（无法自动将位置模式设置为'高精度'。是否要切换到位置设置页面并手动执行此操作？））{
cordova.plugins.diagnostic.switchToLocationSettings（）;
}
}
}
cordova.plugins.locationAccuracy.request（onRequestSuccess，onRequestFailure，cordova.plugins.locationAccuracy.REQUEST_PRIORITY_HIGH_ACCURACY）;
I want to show an alert saying that "Please turn on your GPS".
How can I get GPS status using phonegap?
I have used following code but I don't get any alert message if GPS is turned off. Instead nothing happens.
<!DOCTYPE html>
<html>
<head>
<title>Device Properties Example</title>
<script type="text/javascript" charset="utf-8" src="cordova.js"></script>
<script type="text/javascript" charset="utf-8">
// Wait for device API libraries to load
//
document.addEventListener("deviceready", onDeviceReady, false);
// device APIs are available
//
function onDeviceReady() {
var test= navigator.geolocation.getCurrentPosition(onSuccess, onError);
}
// onSuccess Geolocation
//
function onSuccess(position) {
var element = document.getElementById('geolocation');
element.innerHTML = 'Latitude: ' + position.coords.latitude + '<br />' +
'Longitude: ' + position.coords.longitude + '<br />' +
'Altitude: ' + position.coords.altitude + '<br />' +
'Accuracy: ' + position.coords.accuracy + '<br />' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '<br />' +
'Heading: ' + position.coords.heading + '<br />' +
'Speed: ' + position.coords.speed + '<br />' +
'Timestamp: ' + position.timestamp + '<br />';
}
// onError Callback receives a PositionError object
//
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
</script>
</head>
<body>
<p id="geolocation"> Finding geolocation...</p>
</body>
</html>
Assuming we're talking just about Android platform only, as @Joerg rightly says, you can use cordova.plugins.diagnostic to check if GPS is enabled using isGpsLocationEnabled():
cordova.plugins.diagnostic.isGpsLocationEnabled(function(enabled){
console.log("GPS location is " + (enabled ? "enabled" : "disabled"));
}, function(error){
console.error("The following error occurred: "+error);
});
If the result is that GPS is switched off, you can either switch the user to the location settings page to manually enable GPS:
cordova.plugins.diagnostic.switchToLocationSettings();
Or, in addition, you could use cordova-plugin-request-location-accuracy to request high accuracy location mode (i.e. GPS) directly from within the app. This will show a native confirm dialog and if user agrees, GPS will be enabled automatically:
function onRequestSuccess(success){
console.log("Successfully requested accuracy: "+success.message);
}
function onRequestFailure(error){
console.error("Accuracy request failed: error code="+error.code+"; error message="+error.message);
if(error.code !== cordova.plugins.locationAccuracy.ERROR_USER_DISAGREED){
if(window.confirm("Failed to automatically set Location Mode to 'High Accuracy'. Would you like to switch to the Location Settings page and do this manually?")){
cordova.plugins.diagnostic.switchToLocationSettings();
}
}
}
cordova.plugins.locationAccuracy.request(onRequestSuccess, onRequestFailure, cordova.plugins.locationAccuracy.REQUEST_PRIORITY_HIGH_ACCURACY);
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