安卓系统获取海拔高度

function getAltitudeFromAndroidSystem() {  
    let LocationManager = plus.android.importClass("android.location.LocationManager");  
    let Context = plus.android.importClass("android.content.Context");  
    let main = plus.android.runtimeMainActivity();  
    let locationManager = main.getSystemService(Context.LOCATION_SERVICE);  
    let location = locationManager.getLastKnownLocation(LocationManager  
        .GPS_PROVIDER);  
    let altitude = plus.android.invoke(location, "getAltitude");  
    let hasAltitude = plus.android.invoke(location, "hasAltitude");  
    plus.android.deleteObject(LocationManager);  
    plus.android.deleteObject(Context);  
    if(hasAltitude) {  
        return altitude;  
    } else {  
        return 0;  
    }  
}