我想显示一条警告说“请打开你的GPS”.
如何使用phonegap获取GPS状态？
我使用了以下代码,但如果关闭GPS,我不会收到任何警报消息.相反没有任何反应
<!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>
解决方法
假设我们只讨论Android平台,正如
@Joerg正确地说,您可以使用
cordova.plugins.diagnostic检查是否使用
isGpsLocationEnabled()启用了GPS：
cordova.plugins.diagnostic.isGpsLocationEnabled(function(enabled){
console.log("GPS location is " + (enabled ? "enabled" : "disabled"));
},function(error){
console.error("The following error occurred: "+error);
});
如果结果是GPS已关闭,您可以将用户切换到位置设置页面以手动启用GPS：
cordova.plugins.diagnostic.switchToLocationSettings();
或者,此外,您可以使用cordova-plugin-request-location-accuracy直接从应用程序内请求高精度定位模式(即GPS).这将显示原生确认对话框,如果用户同意,将自动启用GPS：
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);
