NavigationDrawerFragment without glitch

NavigationDrawerFragment.java

package im.ene.lab.resume.fragments;

import im.ene.lab.resume.R;
import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.Toolbar;
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.ListView;
import android.widget.Toast;

/**
 * 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";

	/**
	 * 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;

	public NavigationDrawerFragment() {

	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mActivity = getActivity();

		// this handler is used to smoothly close the navigation fragment
		mHandler = new Handler();
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		// Indicate that this fragment would like to influence the set of
		// actions in the action bar.
		setHasOptionsMenu(true);

		// Select either the default item (1) or the last selected item.
		selectItem(mCurrentSelectedPosition);
	}

	private Activity mActivity;

	private Handler mHandler;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		View rootView = inflater.inflate(R.layout.fragment_navigation_drawer,
				container, false);

		mDrawerListView = (ListView) rootView.findViewById(R.id.listview);
		mDrawerListView.setAdapter(new ArrayAdapter<String>(getActivity(),
				R.layout.item_drawertext, getActivity().getResources()
						.getStringArray(R.array.navigation_title)) {
		});

		mDrawerListView
				.setOnItemClickListener(new AdapterView.OnItemClickListener() {
					@Override
					public void onItemClick(AdapterView<?> parent, View view,
							final int position, long id) {
						mCurrentSelectedPosition = position;
						mPendingRunnable = new Runnable() {

							@Override
							public void run() {
								if (mCallbacks != null) {
									mCallbacks
											.onNavigationDrawerItemSelected(position);
								}
							}
						};

						if (mDrawerListView != null) {
							mDrawerListView.setItemChecked(position, true);
						}
						if (mDrawerLayout != null) {
							mDrawerLayout.closeDrawer(mFragmentContainerView);
						}
					}
				});

		// this.mDrawerListView
		// .setItemChecked(this.mCurrentSelectedPosition, true);
		return rootView;
	}

	@Override
	public void onResume() {
		super.onResume();
	}

	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, Toolbar toolbar) {
		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(mActivity, /* host Activity */
		mDrawerLayout, /* DrawerLayout object */
		toolbar, /* nav drawer image to replace 'Up' caret */
		R.string.open, R.string.close) {
			@Override
			public void onDrawerClosed(View drawerView) {
				super.onDrawerClosed(drawerView);
				if (!isAdded()) {
					return;
				}

				getActivity().supportInvalidateOptionsMenu(); // calls
																// onPrepareOptionsMenu()
				// If mPendingRunnable is not null, then add to the message
				// queue
				if (mPendingRunnable != null) {
					mHandler.post(mPendingRunnable);
					mPendingRunnable = null;
				}
			}

			@Override
			public void onDrawerOpened(View drawerView) {
				super.onDrawerOpened(drawerView);
				if (!isAdded()) {
					return;
				}

				getActivity().supportInvalidateOptionsMenu(); // calls
																// onPrepareOptionsMenu()
			}
			
			@Override
			public void onDrawerSlide(View drawerView, float slideOffset) {
				super.onDrawerSlide(drawerView, slideOffset);
				
				if (mCallbacks != null)
					mCallbacks.onNavigationPanelSliding(slideOffset);
				
			}
		};

		// Defer code dependent on restoration of previous instance state.
		mDrawerLayout.post(new Runnable() {
			@Override
			public void run() {
				mDrawerToggle.syncState();
			}
		});

		mDrawerLayout.setDrawerListener(mDrawerToggle);
	}

	private Runnable mPendingRunnable;

	private void selectItem(final int position) {
		mCurrentSelectedPosition = position;

		if (mCallbacks != null) {
			mCallbacks.onNavigationDrawerItemSelected(position);
		}

		if (mDrawerListView != null) {
			mDrawerListView.setItemChecked(position, true);
		}

		if (mDrawerLayout != null) {
			mDrawerLayout.closeDrawer(mFragmentContainerView);
		}
	}

	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		try {
			mCallbacks = (NavigationDrawerCallbacks) activity;
		} catch (ClassCastException e) {
			throw new ClassCastException(
					"Activity must implement NavigationDrawerCallbacks.");
		}
	}

	@Override
	public void onDetach() {
		super.onDetach();
		mCallbacks = null;
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
	}

	@Override
	public void onConfigurationChanged(Configuration newConfig) {
		super.onConfigurationChanged(newConfig);
		mDrawerToggle.onConfigurationChanged(newConfig);
	}

	@Override
	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
		// If the drawer is open, show the global app actions in the action bar.
		if (isDrawerOpen()) {
			inflater.inflate(R.menu.global, menu);

			if (mCallbacks != null)
				mCallbacks.onNavigationPanelOpened();

			return;
		}

		super.onCreateOptionsMenu(menu, inflater);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (mDrawerToggle != null && mDrawerToggle.onOptionsItemSelected(item)) {
			return true;
		}

		return super.onOptionsItemSelected(item);
	}

	private ActionBar getActionBar() {
		return ((ActionBarActivity) getActivity()).getSupportActionBar();
	}

	/**
	 * Callbacks interface that all activities using this fragment must
	 * implement.
	 */
	public static interface NavigationDrawerCallbacks {
		/**
		 * Called when an item in the navigation drawer is selected.
		 */
		void onNavigationDrawerItemSelected(int position);

		void onNavigationPanelOpened();

		void onNavigationPanelSliding(float slideOffset);
	}

	public void closeDrawer() {
		mDrawerLayout.closeDrawer(mFragmentContainerView);
	}

}