phonegap：如何检查是否启用gps | 如何检查是否启用gps

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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>

解决方案

假设我们只谈论Android平台，正如所说的那样，您可以使用来检查GPS是否使用：

  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>

解决方案

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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