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私のGPS設定は最初は「オフ」で、このコードを実行しました。CurrentLocationの緯度と経度を取得できます。

しかし、プログラムでオンにすると、設定が変更され、すべてが正常になります。

再度実行したところ、（プロバイダー、場所の参照）が表示されないので、なぜ発生しているのかわかりませんでした。

 public void getCurrentlocation()
{
    String providers = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
    Log.e("provider",providers);
    if(!providers.contains("gps")){
      final Intent poke = new Intent();
      poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
      poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
      poke.setData(Uri.parse("3")); 
      sendBroadcast(poke);
      Log.e("your gps is","enabled");
    }
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
       // Define the criteria how to select the locatioin provider -> use
       // default
       Criteria criteria = new Criteria();
       String provider = locationManager.getBestProvider(criteria,true);
       Location location = locationManager.getLastKnownLocation(provider);

       // Initialize the location fields
       if (location != null) 
       {
        System.out.println("Provider " + provider + " has been selected.");
              strLatitude=String.valueOf(location.getLatitude());
              strLongitude=String.valueOf(location.getLongitude());
              Log.e("lattitude",strLatitude);
              Log.e("logntitude",strLongitude);
       }
       else 
       {
              strLatitude=String.valueOf(0);
              strLongitude=String.valueOf(0);
              Log.e("lattitude",strLatitude);
              Log.e("logntitude",strLongitude);
       }

       Geocoder geocoder = new Geocoder(this, Locale.ENGLISH);

       try {
  List<Address> addresses = geocoder.getFromLocation(Double.parseDouble(strLatitude), Double.parseDouble(strLongitude), 5);
 getAddress(Double.parseDouble(strLatitude), Double.parseDouble(strLongitude));
  if(addresses != null) {
   Address returnedAddress = addresses.get(0);
   StringBuilder strReturnedAddress = new StringBuilder("Address:\n");
   for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
    strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
   }
   Log.e("address",strReturnedAddress.toString());
  }
  else{
   Log.e("not found","No Address returned!");
  }
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  Log.e("cannot get address","Canont get Address!");
 }
    }
4

2 に答える 2

0

これを試して。

Location getGPSLocation(Context context) {
    try {
        LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        Criteria cr = new Criteria();
        cr.setCostAllowed(true);
        cr.setAccuracy(Criteria.NO_REQUIREMENT);
        cr.setPowerRequirement(Criteria.NO_REQUIREMENT);
        String provider = lm.getBestProvider(cr, true);
        if(provider == null)
            provider = lm.getBestProvider(cr, false);
        return lm.getLastKnownLocation(provider);
    }
    catch(Exception e) {
        Log.e("NeartoMe", "Exception while fetch GPS at: " + e.getMessage());
    }
    return null;
}

このように上記のメソッドを呼び出しました。ここでnullが発生する場合は、GPSの取得に問題があることを意味し、場所とセキュリティの設定で「ワイヤレスネットワークの使用」を有効にするようにリダイレクトします。次に、GPSの取得を再試行してください。

Location location = new Helper().getGPSLocation(context);
if(location != null) {
    latitude = (int) (location.getLatitude() * 1E6);
    longitude = (int) (location.getLongitude() * 1E6);
} else {
    Builder alert = new Builder(context);
    alert.setTitle(R.string.app_name);
    alert.setMessage(context.getString(R.string.enable_use_wireless_network));
    alert.setPositiveButton(R.string.button_ok, new DialogInterface.OnClickListener() 
    {
        @Override
        public void onClick(DialogInterface dialog, int which)
        {
            dialog.dismiss();
            context.startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
        }
    });
    alert.show();
}
于 2013-01-20T13:02:26.913 に答える
0

あなたはlastKnownlocationを探しています。これにより、GPSがオンになっている場合にデバイスに最後の既知の場所がある場合、新しい場所が検索され、lastKnownlocationがnullになる可能性があります。

LocationListnerを実装する必要があります。これを使用してみてください：

パブリッククラスGetLocationUpdate{

LocationManager locationManager;
LocationListener locationListner;
LinearLayout linearLayout;
TextView locLat, locLong, locInfo;
LocationProvider locationProvider;
private Context context;

/* public double mLattitude = 28.618527, mLongitude = 77.372642; */

public double mLattitude = 0.0, mLongitude = 0.0;
public static GetLocationUpdate getLocationUpdateInstance;

public static GetLocationUpdate getLocationUpdateInstance(Context context)
{
    getLocationUpdateInstance = new GetLocationUpdate(context);
    return getLocationUpdateInstance;
}

private GetLocationUpdate(Context context)
{
    this.context = context;

    locationManager = (LocationManager) context.getSystemService(context.LOCATION_SERVICE);

    locationListner = new MyLocationListner();
}

public static Criteria createCoarseCriteria()
{

    Criteria c = new Criteria();
    c.setAccuracy(Criteria.ACCURACY_COARSE);
    c.setAltitudeRequired(false);
    c.setBearingRequired(false);
    c.setSpeedRequired(false);
    c.setCostAllowed(true);
    c.setPowerRequirement(Criteria.POWER_HIGH);
    return c;

}

/** this criteria needs high accuracy, high power, and cost */
public static Criteria createFineCriteria()
{

    Criteria c = new Criteria();
    c.setAccuracy(Criteria.ACCURACY_FINE);
    c.setAltitudeRequired(false);
    c.setBearingRequired(false);
    c.setSpeedRequired(true);
    c.setCostAllowed(true);
    c.setPowerRequirement(Criteria.POWER_HIGH);
    return c;

}

public void startLocationListner()
{

    try
    {

        locationManager.requestLocationUpdates(

        LocationManager.GPS_PROVIDER, 1000, 0, locationListner);

        mLattitude = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLatitude();
        mLongitude = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLongitude();
    }
    catch (Exception e)
    {
        // e.printStackTrace();
    }

    try
    {
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 0, locationListner);
        if (mLattitude == 0.0 || mLongitude == 0.0)
        {
            mLattitude = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLatitude();
            mLongitude = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getLongitude();
        }
    }
    catch (Exception e)
    {
        // e.printStackTrace();
    }

    Log.w("value : ",
            String.valueOf(mLattitude) + ":" + String.valueOf(mLongitude));

}

public void stopLocationListner()
{
    if (locationListner != null)
    {

        locationManager.removeUpdates(locationListner);
        locationListner = null;
    }
}

private class MyLocationListner implements LocationListener
{

    @Override
    public void onLocationChanged(Location location)
    {

        mLattitude = location.getLatitude();
        mLongitude = location.getLongitude();

        Log.w("value : ",
                String.valueOf(location.getLatitude()) + String.valueOf(location.getLongitude())
                        + 


        context.sendBroadcast(new Intent(Constants.BRDCAST_LOCATION_UPDATED));

    }

    @Override
    public void onProviderDisabled(String provider)
    {
        // Log.w("provider", provider);

    }

    @Override
    public void onProviderEnabled(String provider)
    {
        // Log.w("provider", provider);

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras)
    {
        // Log.w("status", String.valueOf(status));

    }

}

}

于 2013-01-20T14:25:25.457 に答える