NavigationDrawerFragment.java

package treehou.se.habit.ui.menu;


import android.content.Context;
import android.support.annotation.IntDef;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
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 java.util.ArrayList;
import java.util.List;

import javax.inject.Inject;

import treehou.se.habit.HabitApplication;
import treehou.se.habit.R;
import treehou.se.habit.util.Settings;

public class NavigationDrawerFragment extends Fragment {

    public static final String TAG = "NavigationDrawerFragment";

    @IntDef({NavigationItems.ITEM_SITEMAPS,
            NavigationItems.ITEM_CONTROLLERS,
            NavigationItems.ITEM_SERVER,
            NavigationItems.ITEM_SETTINGS})
    public @interface NavigationItems{
        int ITEM_SITEMAPS       = 1414;
        int ITEM_CONTROLLERS    = 1337;
        int ITEM_SERVER         = 5335;
        int ITEM_SETTINGS       = 4214;
    }

    private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
    private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

    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 mUserLearnedDrawer;

    private ArrayList<DrawerItem> items = new ArrayList<>();
    private ArrayAdapter<DrawerItem> menuAdapter;

    @Inject SharedPreferences sharedPreferences;
    @Inject Settings settings;

    public NavigationDrawerFragment() {
    }

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

        getApplicationComponent().inject(this);

        // Read in the flag indicating whether or not the user has demonstrated awareness of the
        // drawer. See PREF_USER_LEARNED_DRAWER for details.
        mUserLearnedDrawer = sharedPreferences.getBoolean(PREF_USER_LEARNED_DRAWER, false);

        if (savedInstanceState != null) {
            mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
        }

        items.add(new DrawerItem(getActivity().getString(R.string.sitemaps),R.drawable.menu_sitemap, NavigationItems.ITEM_SITEMAPS));
        items.add(new DrawerItem(getActivity().getString(R.string.controllers),R.drawable.menu_remote, NavigationItems.ITEM_CONTROLLERS));
        items.add(new DrawerItem(getActivity().getString(R.string.servers), R.drawable.menu_servers, NavigationItems.ITEM_SERVER));
        items.add(new DrawerItem(getActivity().getString(R.string.settings), R.drawable.menu_settings, NavigationItems.ITEM_SETTINGS));

        menuAdapter = new DrawerAdapter(getActivity(), items);
    }

    protected HabitApplication.ApplicationComponent getApplicationComponent() {
        return ((HabitApplication) getActivity().getApplication()).component();
    }

    @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);
    }

    @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) {
                DrawerItem item = (DrawerItem) parent.getItemAtPosition(position);
                selectItem(item.getValue(), position);
            }
        });

        mDrawerListView.setAdapter(menuAdapter);
        mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
        return mDrawerListView;
    }

    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(),
                mDrawerLayout,
                R.string.navigation_drawer_open,
                R.string.navigation_drawer_close
        ) {
            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if (!isAdded()) {
                    return;
                }

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

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

                if (!mUserLearnedDrawer) {
                    settings.userLearnedDrawer(mUserLearnedDrawer = true);
                }
                getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
            }
        };

        // 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 value, int position) {
        if (mDrawerListView != null) {
            mDrawerListView.setItemChecked(position, true);
        }
        if (mDrawerLayout != null) {
            mDrawerLayout.closeDrawer(mFragmentContainerView);
        }
        if (mCallbacks != null) {
            mCallbacks.onNavigationDrawerItemSelected(value);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        try {
            mCallbacks = (NavigationDrawerCallbacks) context;
        } 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);
        // Forward the new configuration the drawer toggle component.
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        if (mDrawerLayout != null && isDrawerOpen()) {
            showGlobalContextActionBar();
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item);
    }

    /**
     * Per the navigation drawer design guidelines, 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);
    }

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

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

    public static class DrawerItem{

        private String name;
        private int resource;
        private int value;

        public DrawerItem(String name, int resource, int value) {
            this.name = name;
            this.value = value;
            this.resource = resource;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getValue() {
            return value;
        }

        public void setValue(int value) {
            this.value = value;
        }

        public int getResource() {
            return resource;
        }

        public void setResource(int resource) {
            this.resource = resource;
        }

        @Override
        public String toString() {
            return name;
        }
    }

    class DrawerAdapter extends ArrayAdapter<DrawerItem>{

        DrawerAdapter(Context context, List<DrawerItem> objects) {
            super(context, R.layout.item_drawer, objects);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            DrawerItem entry = getItem(position);

            LayoutInflater inflater = LayoutInflater.from(getContext());

            View itemView = inflater.inflate(R.layout.item_drawer, null);
            ImageView imgIcon = (ImageView) itemView.findViewById(R.id.img_icon);
            TextView lblName = (TextView) itemView.findViewById(R.id.lbl_name);

            lblName.setText(entry.getName());
            if(entry.getResource() != 0) {
                imgIcon.setImageResource(entry.getResource());
            }

            return itemView;
        }
    }
}