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我遇到了一个问题，无法在 android 设备中获取 lat 和 long 。看看我的代码如下： -

public NewLocationActivity(final Context mContext) {

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

                locationListener = new LocationListener() {

            public void onLocationChanged(Location location) {

            updateLocation(location);



                mSharedPreferences=mContext.getSharedPreferences(HomeSAFEPref.HomeSAFELocationPref,Context.MODE_PRIVATE);
                SharedPreferences.Editor prefEditor=mSharedPreferences.edit();

                String latitude=String.valueOf(currentLatitude);
                String longitude=String.valueOf(currentLongitude);
                String heading=String.valueOf(currentheading);
                String horizAccuracy=String.valueOf(currenthorizAccuracy);

                prefEditor.putString("Latitude", latitude);
                prefEditor.putString("Longitude", longitude);
                prefEditor.putString("Heading", heading);
                prefEditor.putString("HorizAccuracy", horizAccuracy);
                prefEditor.commit();

                }

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

            public void onProviderEnabled(String provider) {

            }

            public void onProviderDisabled(String provider) {

            }

        };

        locationManager.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
    }

   void  updateLocation(Location location) {
     currentLocation = location;
     this. currentLatitude = currentLocation.getLatitude();
     this. currentLongitude = currentLocation.getLongitude();

     geoField=new GeomagneticField(
            Double.valueOf(location.getLatitude()).floatValue(),
            Double.valueOf(location.getLongitude()).floatValue(),
            Double.valueOf(location.getAltitude()).floatValue(),
            System.currentTimeMillis()
         );

    this.currentheading=geoField.getInclination();
    this.currenthorizAccuracy=currentLocation.getAccuracy();
    this.speed=(int) currentLocation.getSpeed();
 }

当我创建类 NewLocationActivity 构造函数的对象时。但我的问题是 UpdateLocation 方法没有运行。为什么我不知道......但有时在其他设备上它运行完美，我很容易得到纬度和经度。请让我知道为什么我得到 lat 和 long 0,0.Thanks提前..

4

1 回答 1

1

使用此代码：它从您的互联网获取 lat ，long 。您也可以使用 gps 获取 lat ，long 。它是准确的，但在建筑物内无法使用，或者由于它们的接收能力而可能在某些设备中使用。最好的方法是使用两者都写如果gps lat，long为null的条件去wifi

public class NewLocationActivity extends Activity implements LocationListener {


    private LocationManager locationManager;

    /**
     * Called when the activity is first created.
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.digitalsignature);
            getLocation();

    }


    public String[] getLocation()
    {

        String[] locationArray=new String[2];


        locationManager = (LocationManager) DigitalSignatureActivity.this.getSystemService(LOCATION_SERVICE);
        // getting network status
        boolean  isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

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

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

        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 location = locationManager
                        .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location != null) {
                    locationArray[0] = String.valueOf(location.getLatitude());
                    locationArray[1] = String.valueOf(location.getLongitude());

                }
            }
        }
        return locationArray;

    }


    /**
     * Stop using location listener
     * Calling this function will stop using location updates in your app
     * */
    public void stopUsingLocationUpdates(){
        if(locationManager != null){
            locationManager.removeUpdates(DigitalSignatureActivity.this);
        }      
    }


   @Override
    public void onLocationChanged(Location arg0) {
    // TODO Auto-generated method stub

     }

     @Override
     public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub

    }

     @Override
      public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub

    }

     @Override
     public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
    // TODO Auto-generated method stub

     }



}

也在清单中这样声明

  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
于 2013-08-26T09:15:42.080 回答