nearby: Show 'no images in this area' message instead of generic error (#5541)

app/src/main/java/fr/free/nrw/commons/explore/map/ExploreMapFragment.java

@@ -447,6 +447,9 @@ public class ExploreMapFragment extends CommonsDaggerSupportFragment
             .observeOn(AndroidSchedulers.mainThread())
             .subscribe(explorePlacesInfo -> {
                     mediaList = explorePlacesInfo.mediaList;
+                    if(mediaList == null) {
+                        showResponseMessage(getString(R.string.no_pictures_in_this_area));
+                    }
                     updateMapMarkers(explorePlacesInfo);
                     lastMapFocus = new GeoPoint(curLatLng.getLatitude(), curLatLng.getLongitude());
                 },
@@ -475,6 +478,10 @@ public class ExploreMapFragment extends CommonsDaggerSupportFragment
         ViewUtil.showLongToast(getActivity(), message);
     }
 
+    private void showResponseMessage(final String message) {
+        ViewUtil.showLongSnackbar(getView(), message);
+    }
+
     @Override
     public void checkPermissionsAndPerformAction() {
         Timber.d("Checking permission and perfoming action");

app/src/main/java/fr/free/nrw/commons/explore/map/ExploreMapPresenter.java

@@ -167,7 +167,6 @@ public class ExploreMapPresenter
         if (explorePlacesInfo.mediaList != null) {
             prepareNearbyBaseMarkers(explorePlacesInfo, selectedMarker);
         } else {
-            //TODO: SHOW SNACKBAR
             lockUnlockNearby(false); // So that new location updates wont come
             exploreMapFragmentView.setProgressBarVisibility(false);
         }

app/src/main/java/fr/free/nrw/commons/utils/ViewUtil.java

@@ -1,16 +1,22 @@
 package fr.free.nrw.commons.utils;
 
+import static java.security.AccessController.getContext;
+
 import android.app.Activity;
 import android.content.Context;
+import android.graphics.Color;
 import android.view.Display;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.StringRes;
 
+import androidx.core.content.ContextCompat;
 import com.google.android.material.snackbar.Snackbar;
 
+import fr.free.nrw.commons.R;
 import timber.log.Timber;
 
 public class ViewUtil {
@@ -32,6 +38,37 @@ public class ViewUtil {
             }
         });
     }
+    public static void showLongSnackbar(View view, String text) {
+        if(view.getContext() == null) {
+            return;
+        }
+
+        ExecutorUtils.uiExecutor().execute(()-> {
+            try {
+                Snackbar snackbar = Snackbar.make(view, text, Snackbar.LENGTH_SHORT);
+
+                View snack_view = snackbar.getView();
+                TextView snack_text = snack_view.findViewById(R.id.snackbar_text);
+
+                snack_view.setBackgroundColor(Color.LTGRAY);
+                snack_text.setTextColor(ContextCompat.getColor(view.getContext(), R.color.primaryColor));
+                snackbar.setActionTextColor(Color.RED);
+
+                snackbar.setAction("Dismiss", new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        // Handle the action click
+                        snackbar.dismiss();
+                    }
+                });
+
+                snackbar.show();
+
+            }catch (IllegalStateException e) {
+                Timber.e(e.getMessage());
+            }
+        });
+    }
 
     public static void showLongToast(Context context, String text) {
         if (context == null) {

app/src/main/res/values/strings.xml

@@ -355,6 +355,7 @@
   <string name="rotate">Rotate</string>
 
   <string name="error_fetching_nearby_places">Error fetching nearby places.</string>
+  <string name="no_pictures_in_this_area">No pictures in this area</string>
   <string name="no_nearby_places_around">No nearby places around</string>
   <string name="error_fetching_nearby_monuments">Error fetching nearby monuments.</string>
   <string name="no_recent_searches">No recent searches</string>