如何从android获取有关卫星的信息？

Question

我试图从android获取卫星信息并写下以下代码,但没有给出任何结果,任何人都可以指出为什么会如此？

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gps);

    final LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    GpsStatus gpsStatus = locationManager.getGpsStatus(null);
    if(gpsStatus != null)
    {
         Iterable<GpsSatellite>satellites = gpsStatus.getSatellites();
         Iterator<GpsSatellite>sat = satellites.iterator();
         int i=0;
         while (sat.hasNext()) {
             GpsSatellite satellite = sat.next();


             strGpsStats+= (i++) + ": " + satellite.getPrn() + "," + satellite.usedInFix() + "," + satellite.getSnr() + "," + satellite.getAzimuth() + "," + satellite.getElevation()+ "\n\n";
         }
     }
     TextView tv = (TextView)(findViewById(R.id.Gpsinfo));
     tv.setText(strGpsStats);
}

谢谢
Nohsib

Answer 1

根据文件LocationManager.getGpsStatus(...)...

这应仅从onGpsStatusChanged(int)回调中调用,以确保以原子方式复制数据.

尝试GpsStatus.Listener在您的活动上实施并覆盖onGpsStatusChanged(int).例...

public class MyActivity extends Activity implements GpsStatus.Listener {

    LocationManager locationManager = null;
    TextView tv = null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gps);

        tv = (TextView)(findViewById(R.id.Gpsinfo));
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationManager.addGpsStatusListener(this);
    }

    @Override
    public void onGpsStatusChanged(int) {
        GpsStatus gpsStatus = locationManager.getGpsStatus(null);
        if(gpsStatus != null) {
            Iterable<GpsSatellite>satellites = gpsStatus.getSatellites();
            Iterator<GpsSatellite>sat = satellites.iterator();
            int i=0;
            while (sat.hasNext()) {
                GpsSatellite satellite = sat.next();
                strGpsStats+= (i++) + ": " + satellite.getPrn() + "," + satellite.usedInFix() + "," + satellite.getSnr() + "," + satellite.getAzimuth() + "," + satellite.getElevation()+ "\n\n";
            }
            tv.setText(strGpsStats);
        }
    }
}