activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_item_action_provider_action_bar"
        android:actionProviderClass=".widget.CheckBoxActionProvider"
        android:showAsAction="always"
        android:title="Settings"/>

</menu>

checkbox_action_provider.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    style="?attr/actionButtonStyle"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:background="?attr/actionBarItemBackground"
    android:focusable="true" >

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="32dip"
        android:gravity="center_vertical"
        android:text="shadow" />

    <CheckBox
        android:id="@+id/checkbox"
        android:layout_width="32dip"
        android:layout_height="32dip" />

</LinearLayout>

CheckBoxActionProvider.java

package com.psrivastava.deviceframegenerator.widget;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.Toast;

import com.actionbarsherlock.view.ActionProvider;
import com.psrivastava.deviceframegenerator.R;

public class CheckBoxActionProvider extends ActionProvider implements
		OnCheckedChangeListener {

	/** Context for accessing resources. */
	private final Context mContext;

	public CheckBoxActionProvider(Context context) {
		super(context);
		mContext = context;
	}

	@Override
	public View onCreateActionView() {
		// Inflate the action view to be shown on the action bar.
		LayoutInflater layoutInflater = LayoutInflater.from(mContext);
		View view = layoutInflater.inflate(R.layout.checkbox_action_provider,
				null);
		TextView textview = (TextView) view.findViewById(R.id.text);
		textview.setText(getActionText());

		CheckBox checkbox = (CheckBox) view.findViewById(R.id.checkbox);
		checkbox.setOnCheckedChangeListener(this);

		return view;
	}

	public String getActionText() {
		return "Checkbox";
	}

	@Override
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
		switch (buttonView.getId()) {
		case R.id.checkbox:
			Toast.makeText(mContext,
					isChecked ? "checked" : "unchecked",
					Toast.LENGTH_SHORT).show();
		}

	}

}

MainActivity.java

package com.psrivastava.deviceframegenerator.ui;

import android.os.Bundle;

import com.actionbarsherlock.view.Menu;
import com.psrivastava.deviceframegenerator.R;

public class MainActivity extends BaseActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		getSupportMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}