Automatically handle HomeAsUp functionality

NavActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.support.v4.app.TaskStackBuilder;

import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.Window;

public abstract class NavActivity extends SherlockFragmentActivity {
	
	@Override
	protected void onCreate(Bundle arg0) {
		requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		super.onCreate(arg0);
		setSupportProgressBarIndeterminateVisibility(false);
		if (NavUtils.getParentActivityName(this) != null) {
			getSupportActionBar().setDisplayHomeAsUpEnabled(true);
		}
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == android.R.id.home) {
			// Automatically handle hierarchical Up navigation if the proper
			// metadata is available.
			Intent upIntent = NavUtils.getParentActivityIntent(this);
			if (upIntent != null) {
				if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
					TaskStackBuilder b = TaskStackBuilder.create(this);
					b.addParentStack(this);
					b.startActivities();
					
					finish();
				} else {
					NavUtils.navigateUpTo(this, upIntent);
				}
				return true;
			}
		}
		return super.onOptionsItemSelected(item);
	}
	
}