Handle SpacerItem on click correctly.

package com.android.documentsui;

import static com.android.documentsui.Shared.DEBUG;

import android.app.Fragment;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.provider.Settings;

import android.text.TextUtils;

import android.text.format.Formatter;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

 */

public class RootsFragment extends Fragment {

    private static final String TAG = "RootsFragment";

    private static final String EXTRA_INCLUDE_APPS = "includeApps";

    private ListView mList;

    private RootsAdapter mAdapter;

    private LoaderCallbacks<Collection<RootInfo>> mCallbacks;

    private static final String EXTRA_INCLUDE_APPS = "includeApps";

    public static void show(FragmentManager fm, Intent includeApps) {

        final Bundle args = new Bundle();

            } else if (item instanceof AppItem) {

                DocumentsActivity activity = DocumentsActivity.get(RootsFragment.this);

                activity.onAppPicked(((AppItem) item).info);

            } else if (item instanceof SpacerItem) {

                if (DEBUG) Log.d(TAG, "Ignoring click on spacer item.");

            } else {

                throw new IllegalStateException("Unknown root: " + item);

            }