自動更新GPS位置

Question

我使用的是Unity的GPS系統，並注意到它從未更新過。我不得不關閉應用程序並重新啓動它以獲取當前位置。

using UnityEngine; 
using UnityEngine.UI; 
using System.Collections; 

public class TestLocationService : MonoBehaviour { 
    public GameObject longText; 
    public GameObject latText; 

    IEnumerator Start() { 
     Text longitudeText = longText.GetComponent<Text>(); 
     Text latitudeText = latText.GetComponent<Text>(); 

     if (!Input.location.isEnabledByUser) 
      yield break; 

     Input.location.Start(); 

     int maxWait = 20; 
     while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0) { 
      yield return new WaitForSeconds(1); 
      maxWait--; 
     } 

     if (maxWait < 1) { 
      print("Timed out"); 
      yield break; 
     } 


     if (Input.location.status == LocationServiceStatus.Failed) { 
      print("Unable to determine device location"); 
      yield break; 
     } else { 
      print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp); 
      longitudeText.text = "Longitude: " + Input.location.lastData.longitude; 
      latitudeText.text = "Latitude: " + Input.location.lastData.latitude; 
     } 

     Input.location.Stop(); 
    } 
} 

我希望在自動更新到我目前所在的位置時有一些幫助！提前致謝！

Answer 1

您所擁有的密碼將顯示一次GPS位置，然後撥打Input.location.Stop();即可停止GPS。

將

print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp); 
longitudeText.text = "Longitude: " + Input.location.lastData.longitude; 
latitudeText.text = "Latitude: " + Input.location.lastData.latitude; 

在while循環再加入yield return new WaitForSeconds(1);的while循環中等待一段時間。另一種方法是啓動另一個協程，隨着時間的推移更新GPS位置。

事情是這樣的：

public class TestLocationService : MonoBehaviour 
{ 

    public GameObject longText; 
    public GameObject latText; 

    IEnumerator coroutine; 

    IEnumerator Start() 
    { 
     coroutine = updateGPS(); 

     Text longitudeText = longText.GetComponent<Text>(); 
     Text latitudeText = latText.GetComponent<Text>(); 

     if (!Input.location.isEnabledByUser) 
      yield break; 

     Input.location.Start(); 

     int maxWait = 20; 
     while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0) 
     { 
      yield return new WaitForSeconds(1); 
      maxWait--; 
     } 

     if (maxWait < 1) 
     { 
      print("Timed out"); 
      yield break; 
     } 


     if (Input.location.status == LocationServiceStatus.Failed) 
     { 
      print("Unable to determine device location"); 
      yield break; 
     } 
     else 
     { 
      print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp); 
      longitudeText.text = "Longitude: " + Input.location.lastData.longitude; 
      latitudeText.text = "Latitude: " + Input.location.lastData.latitude; 
      StartCoroutine(coroutine); 
     } 
    } 

    IEnumerator updateGPS() 
    { 
     float UPDATE_TIME = 3f; //Every 3 seconds 
     WaitForSeconds updateTime = new WaitForSeconds(UPDATE_TIME); 

     while (true) 
     { 
      print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp); 
      //longitudeText.text = "Longitude: " + Input.location.lastData.longitude; 
      //latitudeText.text = "Latitude: " + Input.location.lastData.latitude; 
      yield return updateTime; 
     } 
    } 

    void stopGPS() 
    { 
     Input.location.Stop(); 
     StopCoroutine(coroutine); 
    } 

    void OnDisable() 
    { 
     stopGPS(); 
    } 
}