Ionic 3如何知道GPS是否启用

Question

我正在使用Ionic 3并且在需要的页面中跟随用户的位置（仅纬度和经度）。如何知道GPS是否启用？如何知道用户是否通过Android控制面板禁用GPS？

这是我的代码：

this.geolocation.watchPosition({enableHighAccuracy : true,maximumAge:0}).filter((p: any) => p.code === undefined).subscribe((position: Geoposition)=>{
    this.latitude = position.coords.latitude;
    this.longitude = position.coords.longitude;  
});

Answer 1

使用android权限https://ionicframework.com/docs/native/android-permissions/

this.geolocation.watchPosition({enableHighAccuracy : true,maximumAge:0}).filter((p: any) => p.code === undefined).subscribe((position: Geoposition)=>{
   this.androidPermissions.checkPermission(this.androidPermissions.PERMISSION.ACCESS_COARSE_LOCATION).then(
     result => console.log('Has permission?',result.hasPermission),
     err => this.androidPermissions.requestPermission(this.androidPermissions.PERMISSION.ACCESS_COARSE_LOCATION)
   );
   this.latitude = position.coords.latitude;
   this.longitude = position.coords.longitude;  
});