我正在编写一个圈速计时应用，但遇到了GPS更新频率问题。当速度超过75公里/小时（21米/秒）时，我的代码停止工作。我的问题是如何请求更快速的更新？我需要它在高达300公里/小时（83米/秒）的速度下工作，并希望该应用程序每行驶几米就获得一次更新，这意味着它需要每0.025秒获得一次更新@ 300km/h。以下是我的代码，我尝试了另一种获取时间戳的代码，但结果相同，我相信这是一个GPS更新频率问题而不是代码问题。我希望在手机通过切线接近半径时每行驶几米就能获得更新。
int prox = 30; // Proximity Switch To Finish Line = 30 meters
int speedGov = 0; // Speed In Kmh
public void OnProviderDisabled(string provider)
{
}
public void OnProviderEnabled(string provider)
{
}
public void OnStatusChanged(string provider, Availability status, Bundle extras)
{
}
protected override void OnResume()
{
this.InitializeLocationManager();
base.OnResume();
_locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this);
}
void InitializeLocationManager()
{
_locationManager = (LocationManager)GetSystemService(LocationService);
Criteria criteriaForLocationService = new Criteria
{
Accuracy = Accuracy.Fine
};
IList
if (acceptableLocationProviders.Any())
{
_locationProvider = acceptableLocationProviders.First();
}
else
{
_locationProvider = String.Empty;
}
}
public void OnLocationChanged(Location location)
{
_currentLocation = location;
if (_currentLocation == null)
{
}
else
{
d2fl = Convert.ToInt32(_currentLocation.DistanceTo(fl));
speedGov = Convert.ToInt32(_currentLocation.Speed * 3.6);
}
}
int A = 0; // 1st Distance to Finish Line
int B = 1000000; // 2nd Distance to Finish Line
// Get Time Stamp
while (true)
{
A = d2fl;
if (A > B && d2fl < prox && speedGov > 2) // Travelling away from Finish Line & Within 30m proximity to Finish Line & Going faster than 2km/h
{
// Time stamp for when phone first starts travelling away from Finish Line
string hours = DateTime.Now.ToString("HH");
string minutes = DateTime.Now.ToString("mm");
string seconds = DateTime.Now.ToString("ss");
string milliseconds = DateTime.Now.ToString("fff");
lapFinishTimeStamp = (Convert.ToDecimal(hours) * 3600) + (Convert.ToDecimal(minutes) * 60) + Convert.ToDecimal(seconds) + (Convert.ToDecimal(milliseconds) / 1000);
A = 0;
B = 1000000;
break;
}
B = A;
}
// Alternate Get Time Stamp - worked the same as above "Get Time Stamp"
while (true)
{
int A = d2fl;
Thread.Sleep(5);
int B = d2fl;
if (A < B && d2fl < prox && speedGov > 2)
{
string hours = DateTime.Now.ToString("HH");
string minutes = DateTime.Now.ToString("mm");
string seconds = DateTime.Now.ToString("ss");
string milliseconds = DateTime.Now.ToString("fff");
lapFinishTimeStamp = (Convert.ToDecimal(hours) * 3600) + (Convert.ToDecimal(minutes) * 60) + Convert.ToDecimal(seconds) + (Convert.ToDecimal(milliseconds) / 1000);
A = 0;
B = 0;
break;
}
A = 0;
B = 0;
}
我在这个论坛上看了一些其他答案，但它们都是几年前的。这个应用程序需要在Galaxy S4及以上版本上工作。
另外，我对GPS频率有些困惑，从我读过的资料来看，GPS频率操作速度相当高（硬件大约为1.6 GHz），但手机操作系统似乎会将数据裁剪到较低的频率，这是故意的吗？