Android Open Source - iEtueri Navigation Drawer Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

package navigationdrawer;
// w  w w. j  ava  2  s . c  o m
import java.util.ArrayList;

import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
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.ListView;

import com.javils.ietueri.R;

/**
 * Class for the Navigation Drawer Fragment
 * 
 * @author Javier Luque Sanabria
 * 
 */
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.
   */
  private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

  /** A pointer to the current callbacks instance (the Activity) */
  private NavigationDrawerCallbacks callBacks;

  /** Helper component that ties the action bar to the navigation drawer. */
  private ActionBarDrawerToggle drawerToggle;
  private DrawerLayout drawerLayout;
  private ListView drawerListView;
  private View fragmentContainerView;

  private int currentSelectedPosition;
  private boolean fromSavedInstanceState;
  private boolean userLearnedDrawer;

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

    // Get the preferences
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
    userLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

    if (savedInstanceState != null) {
      currentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
      fromSavedInstanceState = true;
    }

  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    // Indicate that this fragment would like to influence the set of
    // actions in the action bar.
    super.onActivityCreated(savedInstanceState);
    setHasOptionsMenu(true);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    drawerListView = (ListView) inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
    drawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position - 1);
      }
    });

    drawerListView.addHeaderView(inflater.inflate(R.layout.header_navigation_drawer, container, false));

    ArrayList<DrawerList> drawerList = new ArrayList<DrawerList>();

    // Make the elements of the menu.
    drawerList.add(new DrawerList(R.drawable.new_today, R.string.title_today));
    drawerList.add(new DrawerList(R.drawable.new_schedule, R.string.title_schedule));
    drawerList.add(new DrawerList(R.drawable.new_homework, R.string.title_homework));
    drawerList.add(new DrawerList(R.drawable.new_exams, R.string.title_exam));
    drawerList.add(new DrawerList(R.drawable.ic_courses, R.string.title_course));
    drawerList.add(new DrawerList(R.drawable.new_subjects, R.string.title_subject));

    // Fill all the ListView with the values of drawerList
    DrawerListAdapter adapter = new DrawerListAdapter(getActivity(), R.layout.drawer_list_item, drawerList);
    drawerListView.setAdapter(adapter);

    drawerListView.setItemChecked(currentSelectedPosition, true);

    return drawerListView;
  }

  /**
   * 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) {
    this.fragmentContainerView = getActivity().findViewById(fragmentId);
    this.drawerLayout = drawerLayout;

    ActionBar actionBar = getActivity().getActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setHomeButtonEnabled(true);

    // ActionBarDrawerToggle ties together the the proper interactions
    // between the navigation drawer and the action bar app icon.
    drawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, R.drawable.ic_drawer, 0, 0) {

      @Override
      public void onDrawerClosed(View drawerView) {
        super.onDrawerClosed(drawerView);

        if (!isAdded())
          return;

        // call onPrepareOptionsMenu()
        getActivity().invalidateOptionsMenu();
      }

      @Override
      public void onDrawerOpened(View drawerView) {
        super.onDrawerOpened(drawerView);

        if (!isAdded())
          return;

        // The user manually opened the drawer; store this flag to
        // prevent auto-showing the navigation drawer automatically in
        // the future.
        if (!userLearnedDrawer) {
          userLearnedDrawer = true;
          SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
          sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
        }

        // call onPrepareOptionsMenu()
        getActivity().invalidateOptionsMenu();
      }
    };

    // If the user hasn't 'learned' about the drawer, open it to introduce
    // them to the drawer, per the navigation drawer design guidelines.
    if (!userLearnedDrawer | !fromSavedInstanceState)
      this.drawerLayout.openDrawer(fragmentContainerView);

    // Defer code dependent on restoration of previous instance state.
    this.drawerLayout.post(new Runnable() {

      @Override
      public void run() {
        drawerToggle.syncState();
      }
    });

    this.drawerLayout.setDrawerListener(drawerToggle);
  }

  /**
   * Select the item in the ListView, close Navigation and set checked the
   * option selected.
   * 
   * @param position
   *            number of the item position in the menu.
   */
  private void selectItem(int position) {
    currentSelectedPosition = position;

    if (drawerListView != null)
      drawerListView.setItemChecked(position, true);

    if (drawerLayout != null)
      drawerLayout.closeDrawer(fragmentContainerView);

    if (callBacks != null)
      callBacks.onNavigationDrawerItemSelected(position);

  }

  /**
   * Return if the navigation is open or close
   * 
   * @return true if navigation is open, false in other case
   */
  public boolean isDrawerOpen() {
    return drawerLayout != null && drawerLayout.isDrawerOpen(fragmentContainerView);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    callBacks = (NavigationDrawerCallbacks) activity;
  }

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

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

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

    // Forward the new configuration the drawer toggle component.
    drawerToggle.onConfigurationChanged(newConfig);
  }

  @Override
  public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // If the drawer is open, set in the action bar the title of the app.
    if (isDrawerOpen()) {
      ActionBar actionBar = getActivity().getActionBar();
      actionBar.setDisplayShowTitleEnabled(true);
      actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
      actionBar.setTitle(R.string.app_name);
    }

    super.onCreateOptionsMenu(menu, inflater);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (drawerToggle.onOptionsItemSelected(item))
      return true;
    return super.onOptionsItemSelected(item);
  }
}

Java Source Code List

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