Use Toolbar navigation item(LEFT) for dismiss item and option menu(RIGHT) for saveNote item.
Dismiss: 
You can use Toolbar navigation item as dismiss action. Set
  close icon as Toolbar navigation icon by using
  Toolbar.setNavigationIcon(). To handle the click event, add
  NavigationOnClickListener to Toolbar.
SaveNote: 
Inflate menu XML to Toolbar using Toolbar.inflateMenu(). To
  handle saveNote item click event, add OnMenuItemClickListener to
  Toolbar.
Follow below steps:
1. Remove dismiss item from menu XML.
// menu_main.xml
<?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/saveNote"
        android:icon="@drawable/save"
        android:title="Done"
        app:showAsAction="always">
    </item>
</menu>
2. In your activity, do below changes for dismiss and saveNote actions.
public class MainActivity extends AppCompatActivity {
    // ToolBar
    Toolbar mToolBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...........
        .....................
        // ToolBar
        mToolBar = (Toolbar) findViewById(R.id.toolbar);
        // Required to use Toolbar as ActionBar
        setSupportActionBar(mToolBar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setTitle("StackOverflow");
        // Dismiss Action
        mToolBar.setNavigationIcon(R.drawable.close);
        mToolBar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Do something
                Toast.makeText(getApplicationContext(), "Dismiss", Toast.LENGTH_SHORT).show();
            }
        });
        // SaveNote Action
        mToolBar.inflateMenu(R.menu.menu_main);
        mToolBar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if (item.getItemId() == R.id.saveNote)
                {
                    // Do something
                    Toast.makeText(getApplicationContext(), "Save", Toast.LENGTH_SHORT).show();
                }
                return true;
            }
        });
        .............
        ....................... 
    }
}
OUTPUT:

Hope this will help~