Added delete button to statistics screen

uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitScreen.java

@@ -27,6 +27,7 @@ import org.isoron.uhabits.activities.common.dialogs.*;
 import org.isoron.uhabits.activities.habits.edit.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.core.ui.screens.habits.show.*;
+import org.isoron.uhabits.core.ui.callbacks.OnConfirmedCallback;
 
 import javax.inject.*;
 
@@ -45,6 +46,9 @@ public class ShowHabitScreen extends BaseScreen
     @NonNull
     private final EditHabitDialogFactory editHabitDialogFactory;
 
+    @NonNull
+    private final ConfirmDeleteDialogFactory confirmDeleteDialogFactory;
+
     private final Lazy<ShowHabitBehavior> behavior;
 
     @Inject
@@ -53,10 +57,12 @@ public class ShowHabitScreen extends BaseScreen
                            @NonNull ShowHabitRootView view,
                            @NonNull ShowHabitsMenu menu,
                            @NonNull
-                               EditHabitDialogFactory editHabitDialogFactory,
+                                   EditHabitDialogFactory editHabitDialogFactory,
+                           @NonNull ConfirmDeleteDialogFactory confirmDeleteDialogFactory,
                            @NonNull Lazy<ShowHabitBehavior> behavior)
     {
         super(activity);
+        this.confirmDeleteDialogFactory = confirmDeleteDialogFactory;
         setMenu(menu);
         setRootView(view);
 
@@ -116,6 +122,18 @@ public class ShowHabitScreen extends BaseScreen
         {
             case COULD_NOT_EXPORT:
                 showMessage(R.string.could_not_export);
+            case HABIT_DELETED:
+                showMessage(R.string.delete_habits_message);
         }
     }
+
+    @Override
+    public void showDeleteConfirmationScreen(OnConfirmedCallback callback) {
+        activity.showDialog(confirmDeleteDialogFactory.create(callback));
+    }
+
+    @Override
+    public void endActivity() {
+        activity.finish();
+    }
 }

uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitsMenu.java

@@ -57,6 +57,10 @@ public class ShowHabitsMenu extends BaseMenu
                 behavior.get().onExportCSV();
                 return true;
 
+            case R.id.action_delete:
+                behavior.get().onDeleteHabit();
+                return true;
+
             default:
                 return false;
         }

uhabits-android/src/main/res/menu/show_habit.xml

@@ -26,6 +26,11 @@
         android:title="@string/export"
         app:showAsAction="never"/>
 
+    <item
+        android:id="@+id/action_delete"
+        android:title="@string/delete"
+        app:showAsAction="never"/>
+
     <item
         android:id="@+id/action_edit_habit"
         android:icon="?iconEdit"

uhabits-core/src/main/java/org/isoron/uhabits/core/ui/screens/habits/show/ShowHabitMenuBehavior.java

@@ -21,8 +21,11 @@ package org.isoron.uhabits.core.ui.screens.habits.show;
 
 import android.support.annotation.*;
 
+import org.isoron.uhabits.core.commands.CommandRunner;
+import org.isoron.uhabits.core.commands.DeleteHabitsCommand;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.core.tasks.*;
+import org.isoron.uhabits.core.ui.callbacks.OnConfirmedCallback;
 
 import java.io.*;
 import java.util.*;
@@ -45,18 +48,23 @@ public class ShowHabitMenuBehavior
     @NonNull
     private System system;
 
+    @NonNull
+    private CommandRunner commandRunner;
+
     @Inject
     public ShowHabitMenuBehavior(@NonNull HabitList habitList,
                                  @NonNull Habit habit,
                                  @NonNull TaskRunner taskRunner,
                                  @NonNull Screen screen,
-                                 @NonNull System system)
+                                 @NonNull System system,
+                                 @NonNull CommandRunner commandRunner)
     {
         this.habitList = habitList;
         this.habit = habit;
         this.taskRunner = taskRunner;
         this.screen = screen;
         this.system = system;
+        this.commandRunner = commandRunner;
     }
 
     public void onEditHabit()
@@ -77,9 +85,21 @@ public class ShowHabitMenuBehavior
             }));
     }
 
+    public void onDeleteHabit()
+    {
+        List<Habit> selected = Collections.singletonList(habit);
+
+        screen.showDeleteConfirmationScreen(() -> {
+            commandRunner.execute(new DeleteHabitsCommand(habitList, selected),
+                    null);
+            screen.showMessage(Message.HABIT_DELETED);
+            screen.endActivity();
+        });
+    }
+
     public enum Message
     {
-        COULD_NOT_EXPORT
+        COULD_NOT_EXPORT, HABIT_DELETED
     }
 
     public interface Screen
@@ -89,6 +109,11 @@ public class ShowHabitMenuBehavior
         void showMessage(Message m);
 
         void showSendFileScreen(String filename);
+
+        void showDeleteConfirmationScreen(
+                @NonNull OnConfirmedCallback callback);
+
+        void endActivity();
     }
 
     public interface System