GPS跟踪位置变化过程的代码

    技术2022-05-19  19

    package net.ispiders.whereami; import android.app.Activity; import android.content.Context; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.widget.TextView; public class WhereAmI extends Activity {     @Override     public void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         LocationManager locationManager;         String context = Context.LOCATION_SERVICE;         locationManager = (LocationManager)getSystemService(context);         Criteria criteria = new Criteria();         criteria.setAccuracy(Criteria.ACCURACY_FINE);         criteria.setAltitudeRequired(false);         criteria.setBearingRequired(false);         criteria.setCostAllowed(true);         criteria.setPowerRequirement(Criteria.POWER_LOW);         String provider = locationManager.getBestProvider(criteria, true);         Location location = locationManager.getLastKnownLocation(provider);         updateWithNewLocation(location);         locationManager.requestLocationUpdates(provider, 2000, 10,                                             locationListener);     }     private final LocationListener locationListener = new LocationListener()     {         public void onLocationChanged(Location location)         {             updateWithNewLocation(location);         }         public void onProviderDisabled(String provider)         {             updateWithNewLocation(null);         }         public void onProviderEnabled(String provider)         {         }         public void onStatusChanged(String provider, int status,                                 Bundle extras)         {         }     };     private void updateWithNewLocation(Location location)     {         String latLongString;         TextView myLocationText;         myLocationText = (TextView)findViewById(R.id.myLocationText);         if (location != null)         {             double lat = location.getLatitude();             double lng = location.getLongitude();             latLongString = "Lat:" + lat + "/nLong:" + lng;         }         else         {             latLongString = "No location found";         }         myLocationText.setText("Your Current Position is:/n" +                               latLongString);     } }  


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