[android] Add a new alert dialog when we remove the last list

Signed-off-by: Jean-Baptiste <jeanbaptiste.charron@outlook.fr>

android/app/src/main/java/app/organicmaps/bookmarks/BookmarkCategoriesFragment.java

@@ -197,10 +197,8 @@ public class BookmarkCategoriesFragment extends BaseMwmRecyclerFragment<Bookmark
                                         () -> onShareActionSelected(mSelectedCategory, KmlFileType.Text)));
       items.add(new MenuBottomSheetItem(R.string.export_file_gpx, R.drawable.ic_file_gpx,
                                         () -> onShareActionSelected(mSelectedCategory, KmlFileType.Gpx)));
-      // Disallow deleting the last category
-      if (getAdapter().getBookmarkCategories().size() > 1)
-        items.add(new MenuBottomSheetItem(R.string.delete, R.drawable.ic_delete,
-                                          () -> onDeleteActionSelected(mSelectedCategory)));
+      items.add(new MenuBottomSheetItem(R.string.delete, R.drawable.ic_delete,
+                                        () -> onDeleteActionSelected(mSelectedCategory)));
     }
     return items;
   }
@@ -297,8 +295,19 @@ public class BookmarkCategoriesFragment extends BaseMwmRecyclerFragment<Bookmark
 
   private void onDeleteActionSelected(@NonNull BookmarkCategory category)
   {
-    BookmarkManager.INSTANCE.deleteCategory(category.getId());
-    getAdapter().notifyDataSetChanged();
+    // Disallow deleting the last category
+    if ((getAdapter().getBookmarkCategories().size() > 1))
+    {
+        BookmarkManager.INSTANCE.deleteCategory(category.getId());
+        getAdapter().notifyDataSetChanged();
+    }
+    else
+    {
+        new MaterialAlertDialogBuilder(requireActivity())
+                .setMessage(R.string.unable_to_delete_list)
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> dialog.dismiss())
+                .show();
+    }
   }
 
   private void onSettingsActionSelected(@NonNull BookmarkCategory category)

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

@@ -974,4 +974,5 @@
     <string name="download_resources_custom_url_hint">https://cdn-fi-1.comaps.app/</string>
     <string name="download_resources_custom_url_summary_none">Not set</string>
     <string name="download_resources_custom_url_error_scheme">Please enter a full URL starting with https:// and ending with /</string>
+    <string name="unable_to_delete_list">The last list cannot be deleted. Create a new list to remove it</string>
 </resources>

libs/drape_frontend/user_event_stream.cpp

@@ -31,8 +31,8 @@ namespace df
 {
 namespace
 {
-uint64_t constexpr kDoubleTapPauseMs = 200;
-uint64_t constexpr kLongTouchMs = 700;
+uint64_t constexpr kDoubleTapPauseMs = 250;
+uint64_t constexpr kLongTouchMs = 500;
 uint64_t constexpr kKineticDelayMs = 500;
 
 float constexpr kForceTapThreshold = 0.75;