[Actiobar] settings menu - call method in fragment

call method exists in fragment from actionbar settings.java

//source - http://stackoverflow.com/a/22182746/1320686
//the activity_main.xml
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Framelayout to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->
    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="#272727"
        android:dividerHeight="1dp"        
        android:listSelector="@drawable/list_selector"
        android:background="#303030"/>
</android.support.v4.widget.DrawerLayout>


//menu > main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/action_test"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_test"/>
    <item
        android:id="@+id/action_pipiscrew"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/pipiscrew"/>
</menu>

//activity_main.xml
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// toggle nav drawer on selecting action bar app icon/title
		if (mDrawerToggle.onOptionsItemSelected(item)) {
			return true;
		}
		
		// Handle action bar actions click
		switch (item.getItemId()) {
		case R.id.action_test:
			test();
			return true;
		default:
			return super.onOptionsItemSelected(item);
		}
	}

	private void test()
	{ 
	        //is a test!
	        Fragment currentFragment = getFragmentManager().findFragmentById(R.id.frame_container);
	 
	        if (currentFragment instanceof my_fragment) {
	            my_fragment x = (my_fragment) currentFragment;
	            x.pipiscrew_method();
	        }
	}
	
//my_fragment.java
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
		
		//Report that this fragment would like to participate in populating the options menu by receiving a call  -  http://developer.android.com/reference/android/app/Fragment.html
		setHasOptionsMenu(true);
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {

		// Handle action bar actions click
		switch (item.getItemId()) {
		case R.id.action_pipiscrew:
			pipiscrew_method();
			return true;
		default:
			return super.onOptionsItemSelected(item);
		}
	}
	
	private void pipiscrew_method()
	{ 
		//is a pipiscrew_method!
	}