ListActivity ready for Context Actionbar multiselect

SelectableArrayListActivity.java

package es.daniel.notes;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;

public class SelectableArrayListActivity<T> extends ListActivity {

    private SelectionAdapter mAdapter;

    private int rowLayout;
    private Bundle savedInstanceState;

    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
            case R.id.context_delete:
                mAdapter.removeSelected();
                mode.finish();
        }
        return false;
    }

    public void onCreate(Bundle savedInstanceState, int listLayout, int rowLayout) {
        this.savedInstanceState = savedInstanceState;
        this.rowLayout = rowLayout;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        onCreate();
        super.onCreate(savedInstanceState);


        mAdapter = new SelectionAdapter(this, rowLayout);
        setListAdapter(mAdapter);
        getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);

        getListView().setMultiChoiceModeListener(new MultiChoiceModeListener() {

            @Override
            public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                return false;
            }

            @Override
            public void onDestroyActionMode(ActionMode mode) {
                mAdapter.clearSelection();
            }

            @Override
            public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                MenuInflater inflater = getMenuInflater();
                inflater.inflate(R.menu.context_menu, menu);
                return true;
            }

            @Override
            public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                return onActionItemClicked(mode, item);
            }

            @Override
            public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
                if (checked) {
                    mAdapter.addSelection(position);
                } else {
                    mAdapter.removeSelection(position);
                }
                mode.setTitle(getString(R.string.context_title) + mAdapter.getNumSelected());
            }
        });

        getListView().setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
                getListView().setItemChecked(position, !mAdapter.isPositionChecked(position));
                return false;
            }
        });
    }

    private class SelectionAdapter extends ArrayAdapter<T> {

        private HashMap<T, Integer> mIdMap = new HashMap<T, Integer>();

        private List<Integer> mSelection = new ArrayList<Integer>();

        private int id = 0;

        public SelectionAdapter(Context context, int rowLayout) {
            super(context, rowLayout);
        }

        @Override
        public void add(T object) {
            super.add(object);
            mIdMap.put(object, id++);
        }

        @Override
        public void addAll(Collection<? extends T> collection) {
            for (T object : collection) {
                add(object);
            }
        }

        @Override
        public void remove(T object) {
            super.remove(object);
            removeSelection(getPosition(object));
            mIdMap.remove(object);
        }

        @Override
        public long getItemId(int position) {
            T item = getItem(position);
            return mIdMap.get(item);
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        public void addSelection(int position) {
            mSelection.add(position);
            notifyDataSetChanged();
        }

        public boolean isPositionChecked(int position) {
            return mSelection.contains(position);
        }

        public List<T> getChecked() {
            List<T> elements = new ArrayList<T>();
            for (int position : mSelection) {
                elements.add(getItem(position));
            }
            return elements;
        }

        public int getNumSelected() {
            return mSelection.size();
        }

        public void removeSelection(int position) {
            mSelection.remove(position);
        }

        public void clearSelection() {
            mSelection = new ArrayList<Integer>();
            notifyDataSetChanged();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = super.getView(position, convertView, parent);//let the adapter handle setting up the row views
            v.setBackgroundColor(getResources().getColor(android.R.color.background_light)); //default color

            if (mSelection.get(position) != null) {
                v.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_light));// this is a selected position so make it red
            }
            return v;
        }

        public void removeSelected() {

        }
    }
}