使用ActionBarSherlock向ActionBar添加按钮

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

    <Button
        android:id="@+id/action_bar_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:text="Button at the bottom" />

</RelativeLayout>

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.ActionMode;

...

public class MainActivity extends SherlockActivity {

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

        // Set the action bar
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setTitle("My Title");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme.Sherlock.Light" parent="Theme.Sherlock.Light.DarkActionBar">
        <item name="actionBarStyle">@style/Widget.Sherlock.Light.ActionBar.Solid.Inverse</item>
        <item name="actionBarTabStyle">@style/Widget.Sherlock.Light.ActionBar.TabView.Inverse</item>
        <item name="actionBarItemBackground">@drawable/abs__item_background_holo_light</item>
        <item name="actionModeStyle">@style/Widget.Sherlock.Light.ActionMode.Inverse</item>
        <item name="actionModeSplitBackground">@drawable/abs__action_bar_item_split_background_holo_light</item>
        <item name="actionModeCloseButtonStyle">@style/Widget.Sherlock.Light.ActionMode.CloseButton.Inverse</item>
    </style>
</resources>

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    // Set the action bar

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    getSupportActionBar().setHomeButtonEnabled(true);

    getSupportActionBar().setTitle("My Title");

    // Create the action mode

    mActionMode = getSupportActionBar().startActionMode(new MyActionMode(this));

}

@Override

public void onDestroyActionMode(ActionMode mode) {

    mActionMode = null;

}

private static class MyActionMode implements ActionMode.Callback {

    private final SherlockActivity mActivity;

    private final ActionBarSherlock mActionBar;

    private final View mCustomView;

    private final Menu mMenu;

    public MyActionMode(SherlockActivity activity) {

        mActivity = activity;

        mActionBar = activity.getSupportActionBar();

        mCustomView = LayoutInflater.from(mActivity).inflate(R.layout.action_mode_custom, null);

        mMenu = mActivity.getMenu();

    }

    @Override

    public boolean onCreateActionMode(ActionMode mode, Menu menu) {

        mActionBar