A quick demonstation of using custom views in the actionbar

Activity.java

    private DemoFragment mFragment;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mFragment = new DemoFragment();
        setContentView(R.layout.content_frame);
        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, mFragment)
                .commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getSupportMenuInflater().inflate(R.menu.demo, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // Do some stuff
                return true;
            case R.id.menu_edit
                // Select our editmode
                mFragment.editModeSelected(true);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

Fragment.java

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.demo, container, false);
        // Inflate a "Done" custom action bar view to serve as the "Up"
        // affordance.
        inflater = (LayoutInflater) getSherlockActivity().getSupportActionBar().getThemedContext()
                .getSystemService(SherlockActivity.LAYOUT_INFLATER_SERVICE);
        customActionBarView = inflater.inflate(R.layout.actionbar_custom_view_done, null);
        customActionBarView.findViewById(R.id.actionbar_done).setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // "Done"
                        editModeSelected(false);
                    }
                });

        return view;
    }

public void editModeSelected(boolean selected) {
        final ActionBar actionBar = this.getSherlockActivity().getSupportActionBar();
        if (selected) {
            // Show the custom action bar view and hide the normal Home icon and
            // title.
            actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM,
                    ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_SHOW_HOME
                            | ActionBar.DISPLAY_SHOW_TITLE);
            actionBar.setCustomView(customActionBarView);
        } else {
            // Leave edit mode.
            actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE,
                    ActionBar.DISPLAY_HOME_AS_UP | ActionBar.DISPLAY_SHOW_HOME
                            | ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_SHOW_TITLE);

        }
    }

Layout.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/actionbar_done"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:drawableLeft="@drawable/ic_action_done"
        android:drawablePadding="8dp"
        android:gravity="center_vertical"
        android:paddingRight="20dp"
        android:text="@string/done"
        android:textColor="@color/white" />

</FrameLayout>