Fix for issue #168

app/src/main/java/org/isoron/uhabits/widgets/BaseWidgetProvider.java

@@ -39,6 +39,9 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
 
     private WidgetPreferences widgetPrefs;
 
+    //Used to show meaningful message if a habit is deleted
+    private Boolean habitNotFound = false;
+
     @Override
     public void onAppWidgetOptionsChanged(@Nullable Context context,
                                           @Nullable AppWidgetManager manager,
@@ -97,7 +100,6 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
             for (int id : widgetIds)
                 update(context, manager, id);
         }, 500);
-
     }
 
     @NonNull
@@ -105,7 +107,10 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
     {
         long habitId = widgetPrefs.getHabitIdFromWidgetId(widgetId);
         Habit habit = habits.getById(habitId);
-        if (habit == null) throw new RuntimeException("habit not found");
+        if (habit == null) {
+            habitNotFound = true;
+            throw new RuntimeException("habit not found");
+        }
         return habit;
     }
 
@@ -119,6 +124,11 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
     {
         RemoteViews errorView =
             new RemoteViews(context.getPackageName(), R.layout.widget_error);
+
+        if(habitNotFound) {
+            errorView.setCharSequence(R.id.label, "setText", context.getString(R.string.habit_not_found));
+        }
+
         manager.updateAppWidget(widgetId, errorView);
     }
 

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

@@ -102,6 +102,7 @@
     <string name="hint_landscape">You can see more days by putting your phone in landscape mode.</string>
     <string name="delete_habits">Delete Habits</string>
     <string name="delete_habits_message">The habits will be permanently deleted. This action cannot be undone.</string>
+    <string name="habit_not_found">Habit deleted / not found</string>
     <string name="weekends">Weekends</string>
     <string name="any_weekday">Monday to Friday</string>
     <string name="any_day">Any day of the week</string>