Improve error message on widget

Fixes #168

app/src/main/java/org/isoron/uhabits/models/HabitNotFoundException.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.isoron.uhabits.models;
+
+public class HabitNotFoundException extends RuntimeException {
+    public HabitNotFoundException() {
+        super();
+    }
+
+    public HabitNotFoundException(String message) {
+        super(message);
+    }
+
+    public HabitNotFoundException(Throwable cause) {
+        super(cause);
+    }
+
+    public HabitNotFoundException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

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

@@ -61,7 +61,7 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
         }
         catch (RuntimeException e)
         {
-            drawErrorWidget(context, manager, widgetId);
+            drawErrorWidget(context, manager, widgetId, e);
             e.printStackTrace();
         }
     }
@@ -105,7 +105,7 @@ 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) throw new HabitNotFoundException();
         return habit;
     }
 
@@ -115,10 +115,16 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
 
     private void drawErrorWidget(Context context,
                                  AppWidgetManager manager,
-                                 int widgetId)
+                                 int widgetId,
+                                 RuntimeException e)
     {
         RemoteViews errorView =
             new RemoteViews(context.getPackageName(), R.layout.widget_error);
+
+        if(e instanceof HabitNotFoundException) {
+            errorView.setCharSequence(R.id.label, "setText", context.getString(R.string.habit_not_found));
+        }
+
         manager.updateAppWidget(widgetId, errorView);
     }
 
@@ -141,7 +147,7 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
         }
         catch (RuntimeException e)
         {
-            drawErrorWidget(context, manager, widgetId);
+            drawErrorWidget(context, manager, widgetId, e);
             e.printStackTrace();
         }
     }

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>