MainActivity Extending a NavigationActivity. On button click nav not showing up

package com.tsm.stormy.ui;

/**
 * Created by Tegh SM on 8/19/2016.
 */

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.FrameLayout;
import android.widget.ListView;
import android.widget.Toast;

import com.google.android.gms.maps.model.LatLng;
import com.google.gson.Gson;
import com.sdsmdg.tastytoast.TastyToast;
import com.tsm.stormy.R;

import java.util.ArrayList;
import java.util.TreeMap;

/**
 * @author dipenp
 *
 * This activity will add Navigation Drawer for our application and all the code related to navigation drawer.
 * We are going to extend all our other activites from this BaseActivity so that every activity will have Navigation Drawer in it.
 * This activity layout contain one frame layout in which we will add our child activity layout.
 */
public class BaseActivity extends AppCompatActivity {
    private static final String TAG = BaseActivity.class.getSimpleName();
    protected FrameLayout frameLayout;
    protected ListView mDrawerList;
    protected ArrayList listArray;
    protected static int position;
    private static boolean isLaunch = true;
    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle actionBarDrawerToggle;
    SharedPreferences mSharedPreferences;
    TreeMap<String, LatLng> savedLocations;
    ArrayList<String> locationNames;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nav_drawer);


        frameLayout = (FrameLayout)findViewById(R.id.content_frame);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        // set a custom shadow that overlays the main content when the drawer opens
        //mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        if (getAllLocations() == null) {
            listArray = new ArrayList();
            listArray.add("No Locations Added");
        } else {
            listArray = getLocationNames();
        }

        // set up the drawer's list view with items and click listener
        mDrawerList.setAdapter(new ArrayAdapter<>(this, R.layout.nav_list_item, listArray));
        mDrawerList.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {

                //openActivity(position);
            }
        });

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions between the sliding drawer and the action bar app icon
        actionBarDrawerToggle = new ActionBarDrawerToggle(
                this,      /* host Activity */
                mDrawerLayout,
                /* DrawerLayout object */
               R.drawable.ic_arrow_to_drawer,     /* nav drawer image to replace 'Up' caret */
                R.string.open_drawer,       /* "open drawer" description for accessibility */
                R.string.close_drawer)      /* "close drawer" description for accessibility */
        {
            @Override
            public void onDrawerClosed(View drawerView) {
                getSupportActionBar().setTitle("Locations");
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
                super.onDrawerClosed(drawerView);
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                getSupportActionBar().setTitle(getString(R.string.app_name));// creates call to onPrepareOptionsMenu()
               supportInvalidateOptionsMenu();
                super.onDrawerOpened(drawerView);
            }

            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                super.onDrawerSlide(drawerView, slideOffset);
            }

            @Override
            public void onDrawerStateChanged(int newState) {
                super.onDrawerStateChanged(newState);
            }
        };
        mDrawerLayout.setDrawerListener(actionBarDrawerToggle);


        /**
         * As we are calling BaseActivity from manifest file and this base activity is intended just to add navigation drawer in our app.
         * We have to open some activity with layout on launch. So we are checking if this BaseActivity is called first time then we are opening our first activity.
         * */
        if(isLaunch){
            /**
             *Setting this flag false so that next time it will not open our first activity.
             *We have to use this flag because we are using this BaseActivity as parent activity to our other activity.
             *In this case this base activity will always be call when any child activity will launch.
             */
            isLaunch = false;
            //openActivity(0);
        }
    }

    /**
     * @param position
     *
     * Launching activity when any list item is clicked.
     */
    /*protected void openActivity(int position) {

        *//**
         * We can set title & itemChecked here but as this BaseActivity is parent for other activity,
         * So whenever any activity is going to launch this BaseActivity is also going to be called and
         * it will reset this value because of initialization in onCreate method.
         * So that we are setting this in child activity.
         *//*
//  mDrawerList.setItemChecked(position, true);
//  setTitle(listArray[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
        BaseActivity.position = position; //Setting currently selected position in this field so that it will be available in our child activities.

        switch (position) {
            case 0:
                startActivity(new Intent(this, Item1Activity.class));
                break;
            case 1:
                startActivity(new Intent(this, Item2Activity.class));
                break;
            case 2:
                startActivity(new Intent(this, Item3Activity.class));
                break;
            case 3:
                startActivity(new Intent(this, Item4Activity.class));
                break;
            case 4:
                startActivity(new Intent(this, Item5Activity.class));
                break;

            default:
                break;
        }

        Toast.makeText(this, "Selected Item Position::"+position, Toast.LENGTH_LONG).show();
    }*/

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.menu_main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        // The action bar home/up action should open or close the drawer.
        // ActionBarDrawerToggle will take care of this.
        if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }

    /*@Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        getMenuInflater().inflate(R.menu.menu_main, menu);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }*/

    @Override
    public void onBackPressed() {
        if(mDrawerLayout.isDrawerOpen(mDrawerList)){
            mDrawerLayout.closeDrawer(mDrawerList);
        }else {
            mDrawerLayout.openDrawer(mDrawerList);
        }
    }

    public void addLocation(LatLng latlng, String name) {

        mSharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor prefsEditor = mSharedPreferences.edit();
        Gson gson = new Gson();
        String json = gson.toJson(latlng);
        prefsEditor.putString(name, json);
        locationNames.add(name);
        prefsEditor.commit();

        String userData = mSharedPreferences.getString(name, json);

        if((userData.equals(json))){
            //password has not been saved...
            Log.d(TAG, "JSON LATLNG saved");
            TastyToast.makeText(BaseActivity.this, "Location Saved", 500, TastyToast.SUCCESS);
        }
        else{
            //password is already there...
            Log.d(TAG, "JSON LATLNG not saved");
            TastyToast.makeText(BaseActivity.this, "Location Unable to Save!", Toast.LENGTH_LONG, TastyToast.ERROR);

        }
    }

    private TreeMap<String, LatLng> getLocation(String name) {
        Gson gson = new Gson();
        String json = mSharedPreferences.getString(name, "");
        LatLng latlng = gson.fromJson(json, LatLng.class);
        TreeMap<String, LatLng> locations = new TreeMap<>();
        locations.put(name, latlng);
        return locations;
    }

    public TreeMap<String, LatLng> getAllLocations() {
        if (locationNames == null) {
            return savedLocations;
        } else {
            for (String name : locationNames) {
                LatLng latLng = getLocation(name).get(name);
                savedLocations.put(name, latLng);
            }
        }
        return savedLocations;
    }

    public ArrayList<String> getLocationNames() {
        for (int i = 0;  i < getAllLocations().size(); i++) {
            ArrayList<String> locationNames = new ArrayList<>();
            locationNames.add(getAllLocations().keySet().toString());
        }
        return locationNames;
    }
}

@Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        getMenuInflater().inflate(R.menu.menu_main, menu);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }