Android Google地图获取当前位置不起作用

我在获取当前用户位置时遇到问题。代码起初可以工作，但过了一段时间它就停止显示当前位置。我尝试了几种方法来解决这个问题，但结果相同。Android Google地图获取当前位置不起作用

这里是我的代码：

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

    mapView = (MapView) findViewById(R.id.mapView); 
    mapController = mapView.getController(); 




    String provider = getProvider(); 

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

    //getLastKnownPoint(); 
    locationManager.requestLocationUpdates(provider, 0, 0, locationListener); 
    drawCurrPositionOverlay(); 


} 


private LocationListener locationListener = new LocationListener() { 


    @Override 
    public void onLocationChanged(Location location) { 
     GeoPoint currentPoint = getCurrentPoint(location); 
     animateToCurrentPoint(currentPoint); 
     currentLocation = location; 
     currentGeoPoint = currentPoint; 

    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 

    } 


}; 

public GeoPoint getCurrentPoint (Location location){ 
    GeoPoint currentPoint = new GeoPoint((int)(location.getLatitude()*1E6),(int)(location.getLongitude()*1E6)); 
    return currentPoint; 

} 

public GeoPoint getLastKnownPoint(){ 

    GeoPoint lastKnownPoint = null; 
    Location lastKnownLocation = locationManager.getLastKnownLocation(getProvider()); 
    if(lastKnownLocation != null){ 
     lastKnownPoint = getCurrentPoint(lastKnownLocation); 
    } 

    return lastKnownPoint; 
} 

public void animateToCurrentPoint(GeoPoint currentPoint){ 

    mapController.animateTo(currentPoint); 
    mapController.setCenter(currentPoint); 
    mapController.setZoom(15); 
} 


public void drawCurrPositionOverlay(){ 
    List<Overlay> overlays = mapView.getOverlays(); 
    CustomItemizedOverlay<CustomOverlayItem> itemizedOverlay; 
    overlays.remove(currPos); 
    Drawable marker = getResources().getDrawable(R.drawable.me); 
    currPos = new MapOverlay(marker,mapView); 
    GeoPoint drawMyPoint = null; 

    if(currentGeoPoint==null){ 
     drawMyPoint = getLastKnownPoint(); 
    } 

    else { 

     drawMyPoint = currentGeoPoint; 
    } 

    OverlayItem overlayitem = new OverlayItem(drawMyPoint, "I'm here ", "wee"); 
    currPos.addOverlay(overlayitem); 
    overlays.add(currPos); 
    currPos.setCurrentLocation(currentLocation); 




} 

public String getProvider() { 
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    Criteria criteria = new Criteria(); 
    criteria.setPowerRequirement(Criteria.NO_REQUIREMENT); 
    criteria.setAccuracy(Criteria.NO_REQUIREMENT); 
    String Provider = locationManager.getBestProvider(criteria, true); 
    return Provider; 
} 




@Override 
protected boolean isRouteDisplayed() { 
    // TODO Auto-generated method stub 
    return false; 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    locationManager.requestLocationUpdates(getProvider(), 100, 1, locationListener); 

} 

@Override 
protected void onPause() { 
    super.onPause(); 
    locationManager.removeUpdates(locationListener); 

}

}

，我也有问题，drawCurrPosition（当代码“被工作”）功能（使用自定义的气球），方法把标记上最后已知位置，而不是在我目前的位置（所以标记总是退一步）。函数仅在打开的应用程序中将标记放在当前位置。

请你能帮助我，我看不出有什么错我的代码

来源

2012-03-21 hyperN

从这个问题的答案，请参阅... 的http：// stackoverflow.com/questions/9586530/positing-user-current-location-and-show-it-in-google-maps/9596183#9596183 – Prem 2012-03-22 06:05:56

谢谢，但仍然不工作=（也许我做错了什么，但我可以'看看是什么，我得到错误无法到达工厂客户端，我得到数字表格时间，并且没有其他显示 – hyperN 2012-03-22 11:53:13

drawCurrPositionOverlay()被称为onCreate()，应该真的只是在onLocationChanged()被调用。这样，您的覆盖图将始终使用当前位置进行更新，而不是仅包含第一个位置。

来源

2012-03-22 01:28:11 SoundsDangerous

如果您点击onPause然后onResume您的位置更新是否恢复正常？ – SoundsDangerous 2012-03-22 01:34:22

感谢您使用drawCurrPositionOverlay（），并且不支持，当我点击onPause和onResume时，位置未正确更新。 – hyperN 2012-03-22 09:35:35

由于一些奇怪的原因，当我重新启动我的手机应用程序再次正常工作 – hyperN 2012-03-22 09:45:19

-1

1）使类GPS追踪器

public class GPSTracker extends Service implements LocationListener { 

private final Context mContext; 

// flag for GPS status 
boolean isGPSEnabled = false; 

// flag for network status 
boolean isNetworkEnabled = false; 

// flag for GPS status 
boolean canGetLocation = false; 

Location location; // location 
double latitude; // latitude 
double longitude; // longitude 

// The minimum distance to change Updates in meters 
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters 

// The minimum time between updates in milliseconds 
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute 

// Declaring a Location Manager 
protected LocationManager locationManager; 

public GPSTracker(Context context) { 
    this.mContext = context; 
    getLocation(); 
} 

public Location getLocation() { 
    try { 
     locationManager = (LocationManager) mContext 
       .getSystemService(LOCATION_SERVICE); 

     // getting GPS status 
     isGPSEnabled = locationManager 
       .isProviderEnabled(LocationManager.GPS_PROVIDER); 

     // getting network status 
     isNetworkEnabled = locationManager 
       .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 

     if (!isGPSEnabled && !isNetworkEnabled) { 
      // no network provider is enabled 
     } else { 
      this.canGetLocation = true; 
      if (isNetworkEnabled) { 
       locationManager.requestLocationUpdates(
         LocationManager.NETWORK_PROVIDER, 
         MIN_TIME_BW_UPDATES, 
         MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
       Log.d("Network", "Network"); 
       if (locationManager != null) { 
        location = locationManager 
          .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
        if (location != null) { 
         latitude = location.getLatitude(); 
         longitude = location.getLongitude(); 
        } 
       } 
      } 
      // if GPS Enabled get lat/long using GPS Services 
      if (isGPSEnabled) { 
       if (location == null) { 
        locationManager.requestLocationUpdates(
          LocationManager.GPS_PROVIDER, 
          MIN_TIME_BW_UPDATES, 
          MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
        Log.d("GPS Enabled", "GPS Enabled"); 
        if (locationManager != null) { 
         location = locationManager 
           .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
         if (location != null) { 
          latitude = location.getLatitude(); 
          longitude = location.getLongitude(); 
         } 
        } 
       } 
      } 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    return location; 
} 

/** 
* Stop using GPS listener 
* Calling this function will stop using GPS in your app 
* */ 
public void stopUsingGPS(){ 
    if(locationManager != null){ 
     locationManager.removeUpdates(GPSTracker.this); 
    }  
} 

/** 
* Function to get latitude 
* */ 
public double getLatitude(){ 
    if(location != null){ 
     latitude = location.getLatitude(); 
    } 

    // return latitude 
    return latitude; 
} 

/** 
* Function to get longitude 
* */ 
public double getLongitude(){ 
    if(location != null){ 
     longitude = location.getLongitude(); 
    } 

    // return longitude 
    return longitude; 
} 

/** 
* Function to check GPS/wifi enabled 
* @return boolean 
* */ 
public boolean canGetLocation() { 
    return this.canGetLocation; 
} 

/** 
* Function to show settings alert dialog 
* On pressing Settings button will lauch Settings Options 
* */ 
public void showSettingsAlert(){ 
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); 

    // Setting Dialog Title 
    alertDialog.setTitle("GPS is settings"); 

    // Setting Dialog Message 
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?"); 

    // On pressing Settings button 
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog,int which) { 
      Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
      mContext.startActivity(intent); 
     } 
    }); 

    // on pressing cancel button 
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
     dialog.cancel(); 
     } 
    }); 

    // Showing Alert Message 
    alertDialog.show(); 
} 

@Override 
public void onLocationChanged(Location location) { 
} 

@Override 
public void onProviderDisabled(String provider) { 
} 

@Override 
public void onProviderEnabled(String provider) { 
} 

@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
} 

@Override 
public IBinder onBind(Intent arg0) { 
    return null; 
}

}

2）在活动中使用代码获取地点

GPSTracker gps = new GPSTracker(TwitterComposeActivity.this); 

     // check if GPS enabled 
     if (gps.canGetLocation()) { 

      latitude = gps.getLatitude(); 
      longitude = gps.getLongitude(); 


     } else { 

      gps.showSettingsAlert(); 
     }

来源

2012-10-25 13:41:50

这是什么问题？ – Gevious 2012-10-25 14:00:44

能否详细说明这个答案？ – dove 2012-10-25 14:03:02

Android Google地图获取当前位置不起作用

回答

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