Android Open Source - dexedd Navigation Drawer Fragment

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License

The source code is released under:
MIT License
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Java Source Code

package com.nav.dexedd.fragment;
// w  ww .j a  v  a2s .c  o  m
import android.os.Handler;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarDrawerToggle;
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;

import com.nav.dexedd.R;

/**
 * Fragment used for managing interactions for and presentation of a navigation drawer.
 *
 * @author Eduardo Naveda
 * @since 0.0.1
 */
public class NavigationDrawerFragment extends Fragment {

    private static final String TAG = NavigationDrawerFragment.class.getSimpleName();

    /**
     * State recreation tag used to remember the position of the selected drawer position.
     */
    private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";

    /**
     * Shared preference tag used to track the user's awareness to the navigation drawer.
     */
    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 = 0;
    private boolean fromSavedInstanceState;
    private boolean userLearnedDrawer;

    public NavigationDrawerFragment() {
    }

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

        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
        userLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

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

        selectItem(currentSelectedPosition);
    }

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        drawerListView = (ListView) inflater.inflate(R.layout.fragment_dex_navigation_drawer, container, false);
        drawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                selectItem(position);
            }
        });
        drawerListView.setAdapter(
                new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1,
                        new String[]{getString(R.string.title_dex), getString(R.string.title_about),}));
        drawerListView.setItemChecked(currentSelectedPosition, true);
        return drawerListView;
    }

    public boolean isDrawerOpen() {
        return drawerLayout != null && drawerLayout.isDrawerOpen(fragmentContainerView);
    }

    /**
     * Users of this fragment must call this method to set up the navigation drawer interactions.
     *
     * @param fragmentId   The 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) {
        fragmentContainerView = getActivity().findViewById(fragmentId);
        this.drawerLayout = drawerLayout;

        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.
        drawerToggle = new ActionBarDrawerToggle(getActivity(), NavigationDrawerFragment.this.drawerLayout,
                R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
            @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 (!userLearnedDrawer) {
                    // The user manually opened the drawer; store this flag to prevent auto-showing
                    // the navigation drawer automatically in the future.
                    userLearnedDrawer = true;
                    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
                    sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
                }

                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 (!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);
    }

    private void selectItem(int position) {
        currentSelectedPosition = position;
        if (drawerListView != null) {
            drawerListView.setItemChecked(position, true);
        }
        if (callbacks != null) {
            callbacks.onNavigationDrawerItemSelected(position);
        }
        if (drawerLayout != null) {
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    drawerLayout.closeDrawer(fragmentContainerView);
                }
            }, 150);
        }
    }

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

    @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, show the global app actions in the action bar. See also
        // showGlobalContextActionBar, which controls the top-left area of the action bar.
        if (drawerLayout != null && isDrawerOpen()) {
            inflater.inflate(R.menu.global, menu);
            showGlobalContextActionBar();
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

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

        if (item.getItemId() == R.id.action_example) {
            Toast.makeText(getActivity(), "I don't work yet!", Toast.LENGTH_SHORT).show();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    /**
     * Updates the action bar to show the global app 'context', rather than just what's in the current screen.
     */
    private void showGlobalContextActionBar() {
        ActionBar actionBar = getActionBar();
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setTitle(R.string.app_name);
    }

    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);

        /**
         * Called when a section has been attached.
         */
        void onSectionAttached(int sectionNumber);
    }
}
Java Source Code List
