Adds "New Skill" button.

app/src/main/java/com/majinnaibu/monstercards/ui/editmonster/EditMonsterViewModel.java

@@ -896,4 +896,11 @@ public class EditMonsterViewModel extends ViewModel {
     public List<Skill> getSkillsArray() {
         return mSkills.getValue();
     }
+
+    public void addNewSkill() {
+        Skill newSkill = new Skill("Unnamed Skill", AbilityScore.DEXTERITY);
+        ArrayList<Skill> newSkills = new ArrayList<>(mSkills.getValue());
+        newSkills.add(newSkill);
+        mSkills.setValue(newSkills);
+    }
 }

app/src/main/java/com/majinnaibu/monstercards/ui/editmonster/EditSkillsFragment.java

@@ -3,9 +3,13 @@ package com.majinnaibu.monstercards.ui.editmonster;
 import android.content.Context;
 import android.os.Bundle;
 import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.NavBackStackEntry;
@@ -31,6 +35,7 @@ public class EditSkillsFragment extends Fragment {
         NavController navController = Navigation.findNavController(requireActivity(), R.id.nav_host_fragment);
         NavBackStackEntry backStackEntry = navController.getBackStackEntry(R.id.edit_monster_navigation);
         mViewModel = new ViewModelProvider(backStackEntry).get(EditMonsterViewModel.class);
+        setHasOptionsMenu(true);
 
         // Set the adapter
         if (view instanceof RecyclerView) {
@@ -42,4 +47,24 @@ public class EditSkillsFragment extends Fragment {
 
         return view;
     }
-}
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
+        inflater.inflate(R.menu.edit_skills_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
+        if (item.getItemId() == R.id.menu_action_add_skill) {
+            mViewModel.addNewSkill();
+            // TODO: navigate to editing the new skill
+//            NavDirections action = MonsterDetailFragmentDirections.actionNavigationMonsterToEditMonsterFragment(monsterDetailViewModel.getId().getValue().toString());
+//            View view = getView();
+//            assert view != null;
+//            Navigation.findNavController(view).navigate(action);
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+}

app/src/main/res/drawable/ic_add_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

app/src/main/res/menu/edit_skills_menu.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/menu_action_add_skill"
+        android:icon="@drawable/ic_add_24"
+        android:title="@string/action_add_skill"
+        app:showAsAction="always" />
+</menu>

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

@@ -1,5 +1,6 @@
 <resources>
     <string name="action_add_monster">Add monster</string>
+    <string name="action_add_skill">Add Skill</string>
     <string name="action_edit">Edit</string>
     <string name="actions_label">Actions</string>
     <string name="app_name">MonsterCards</string>