gt:         if (mDrawerListView != null) {
context: package net.gnehzr.tnoodle.androidsample;
  
  import android.app.Activity;
  import android.content.Context;
  import android.content.SharedPreferences;
  import android.content.res.Configuration;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.os.Bundle;
  import android.preference.PreferenceManager;
  import android.support.v4.app.ActionBarDrawerToggle;
  import android.support.v4.app.Fragment;
  import android.support.v4.view.GravityCompat;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBar;
  import android.support.v7.app.ActionBarActivity;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.AdapterView;
  import android.widget.ArrayAdapter;
  import android.widget.ImageView;
  import android.widget.ListView;
  import android.widget.TextView;
  
  import net.gnehzr.tnoodle.scrambles.Puzzle;
  import net.gnehzr.tnoodle.scrambles.PuzzleIcon;
  import net.gnehzr.tnoodle.scrambles.PuzzlePlugins;
  import net.gnehzr.tnoodle.utils.LazyInstantiator;
  
  import java.io.ByteArrayOutputStream;
  import java.util.ArrayList;
  import java.util.SortedMap;
  
  /**
   * Fragment used for managing interactions for and presentation of a navigation drawer.
   * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
   * design guidelines</a> for a complete explanation of the behaviors implemented here.
   */
  public class NavigationDrawerFragment extends Fragment {
  
      /**
       * Remember the position of the selected item.
       */
      private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
  
      /**
       * Per the design guidelines, you should show the drawer on launch until the user manually
       * expands it. This shared preference tracks this.
       */
      private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
  
      /**
       * A pointer to the current callbacks instance (the Activity).
       */
      private NavigationDrawerCallbacks mCallbacks;
  
      /**
       * Helper component that ties the action bar to the navigation drawer.
       */
      private ActionBarDrawerToggle mDrawerToggle;
  
      private DrawerLayout mDrawerLayout;
      private ListView mDrawerListView;
      private View mFragmentContainerView;
  
      private int mCurrentSelectedPosition = 0;
      private boolean mFromSavedInstanceState;
      private boolean mUserLearnedDrawer;
  
      public NavigationDrawerFragment() {
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          // Read in the flag indicating whether or not the user has demonstrated awareness of the
          // drawer. See PREF_USER_LEARNED_DRAWER for details.
          SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
          mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
  
          if (savedInstanceState != null) {
              mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
              mFromSavedInstanceState = true;
          }
  
          // Select either the default item (0) or the last selected item.
          selectItem(mCurrentSelectedPosition);
  
          // Indicate that this fragment would like to influence the set of actions in the action bar.
          setHasOptionsMenu(true);
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          mDrawerListView = (ListView) inflater.inflate(
                  R.layout.fragment_navigation_drawer, container, false);
          mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
              @Override
              public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                  selectItem(position);
              }
          });
          return mDrawerListView;
      }
  
      public void setPuzzles(SortedMap<String, LazyInstantiator<Puzzle>> puzzles) {
          ArrayAdapter<String> a = new PuzzleArrayAdapter(
                  getActionBar().getThemedContext(),
                  R.layout.puzzle_list_item,
                  puzzles);
          mDrawerListView.setAdapter(a);
          mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
      }
  
      public boolean isDrawerOpen() {
          return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
      }
  
      /**
       * Users of this fragment must call this method to set up the navigation drawer interactions.
       *
       * @param fragmentId   The android:id of this fragment in its activity's layout.
       * @param drawerLayout The DrawerLayout containing this fragment's UI.
       */
      public void setUp(int fragmentId, DrawerLayout drawerLayout) {
          mFragmentContainerView = getActivity().findViewById(fragmentId);
          mDrawerLayout = drawerLayout;
  
          // set a custom shadow that overlays the main content when the drawer opens
          mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
          // set up the drawer's list view with items and click listener
  
          ActionBar actionBar = getActionBar();
          actionBar.setDisplayHomeAsUpEnabled(true);
          actionBar.setHomeButtonEnabled(true);
  
          // ActionBarDrawerToggle ties together the the proper interactions
          // between the navigation drawer and the action bar app icon.
          mDrawerToggle = new ActionBarDrawerToggle(
                  getActivity(),                    /* host Activity */
                  mDrawerLayout,                    /* DrawerLayout object */
                  R.drawable.ic_drawer,             /* nav drawer image to replace 'Up' caret */
                  R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
                  R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
          ) {
              @Override
              public void onDrawerClosed(View drawerView) {
                  super.onDrawerClosed(drawerView);
                  if (!isAdded()) {
                      return;
                  }
  
                  getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
              }
  
              @Override
              public void onDrawerOpened(View drawerView) {
                  super.onDrawerOpened(drawerView);
                  if (!isAdded()) {
                      return;
                  }
  
                  if (!mUserLearnedDrawer) {
                      // The user manually opened the drawer; store this flag to prevent auto-showing
                      // the navigation drawer automatically in the future.
                      mUserLearnedDrawer = true;
                      SharedPreferences sp = PreferenceManager
                              .getDefaultSharedPreferences(getActivity());
                      sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).commit();
                  }
  
                  getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
              }
          };
  
          // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
          // per the navigation drawer design guidelines.
          if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
              mDrawerLayout.openDrawer(mFragmentContainerView);
          }
  
          // Defer code dependent on restoration of previous instance state.
          mDrawerLayout.post(new Runnable() {
              @Override
              public void run() {
                  mDrawerToggle.syncState();
              }
          });
  
          mDrawerLayout.setDrawerListener(mDrawerToggle);
      }
  
      private void selectItem(int position) {
          mCurrentSelectedPosition = position;
  