黑莓 GPS 的经度和纬度返回零

Posted 2023-02-23

【中文标题】黑莓 GPS 的经度和纬度返回零

【英文标题】：Blackberry GPS returns zero for longitude and latitude

【发布时间】：2011-06-28 07:29:23

【问题描述】：

我正在使用以下类从黑莓获取 GPS 位置，但我总是得到零经度和纬度值。这是为什么呢？

public class LocationTracker extends TimerTask 

private double longitude;
private double latitude;
private double altitude;
private LocationProvider lp;

public LocationTracker() 

    super();
    // Set criteria for selecting a location provider:
    Criteria cr = new Criteria();
    cr.setCostAllowed(true);
    cr.setPreferredResponseTime(60);
    cr.setHorizontalAccuracy(Criteria.NO_REQUIREMENT);
    cr.setVerticalAccuracy(Criteria.NO_REQUIREMENT);
    cr.setAltitudeRequired(true);
    cr.isSpeedAndCourseRequired();
    cr.isAddressInfoRequired();

    cr.setPreferredPowerConsumption(Criteria.POWER_USAGE_HIGH);

    try 
        LocationProvider lp = LocationProvider.getInstance(cr);


        Location location = null;
        try 
            location = lp.getLocation(-1);

         catch (InterruptedException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        catch (LocationException e)
            System.out.println(e.toString());
        catch(Exception e )
            System.out.println(e.toString());
        

        longitude = location.getQualifiedCoordinates().getLongitude();
        latitude = location.getQualifiedCoordinates().getLatitude();
        altitude = location.getQualifiedCoordinates().getAltitude();

        if (lp != null) 
            lp.reset(); 
            lp.setLocationListener(null, -1, -1, -1);               
            lp = LocationProvider.getInstance(cr);
            lp.setLocationListener(new MyLocationListener(), 2, -1, -1);
        
         System.out.println("Lon" + longitude + " Lat "+ latitude);
     catch (LocationException le) 
        System.out.println(le.toString());
    catch(Exception e )
        System.out.println(e.toString());
    



public void run() 



public double getLongitude() 
    return longitude;


public double getLatitude() 
    return latitude;


public double getAltitude() 
    return altitude;


private class MyLocationListener implements LocationListener 

    public void locationUpdated(LocationProvider provider, Location location) 

        if (location != null && location.isValid()) 
            QualifiedCoordinates qc = location.getQualifiedCoordinates();

            try 
                latitude = qc.getLatitude();
                longitude = qc.getLongitude();
                altitude = qc.getAltitude();
             catch (Exception e) 
                System.out.println(e.toString());
            
        
    

    public void providerStateChanged(LocationProvider provider, int newState) 
        // TODO: if provider was disabled, then disable reporting
    

【参考方案1】：

您是否从设置中检查 gps 状态？如果它正在工作，请尝试将超时值设置为大约 300 秒而不是 -1。

【参考方案2】：

LocationProvider 可能会返回一个Location 对象，该对象具有isValid() false。这样做是为了通过getExtraInfo() 方法提供更多信息。