アクティビティAndroidを開始できません

このアクティビティを開始しようとすると、NPEが発生します。ナビゲーションドロワーを追加しようとするまで、このアクティビティは正常に機能しています。私はこれを一緒に機能させる方法を見つけることができませんでした。Oncreateメソッドを以下に示します。このアクティビティには、Json解析を含むリストビューと、他のアクティビティにアクセスするためのドロワーメニューが表示されます。

私のコード：

public class FavoritesActivity extends Activity {


private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

// nav drawer title
private CharSequence mDrawerTitle;

// used to store app title
private CharSequence mTitle;

// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;

private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;

private ProgressDialog pDialog;

private static String mylat;
private static String mylng;

// URL to get JSON

private static String url2 = "http://apiurl";

// JSON Node names
private static final String TAG_NAME = "shop_name";
private static final String TAG_ADDRESS_STRING = "shop_address";
private static final String TAG_URL = "shop_url";
private static final String TAG_BOOKLET_URL = "feuilletez";
TextView shop_address;
TextView shop_name;
TextView shop_url;
private LocationManager locMan;
ImageButton feuilletez;
private ListView list;

private String latitude;
private String longitude;


ArrayList<String>shoplatitude;
ArrayList<String>shoplongitude;
ArrayList<String>shopname;
ArrayList<String>shopaddress;
ArrayList<String>shopurl;

// Hashmap for ListView
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();

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


    setContentView(R.layout.activity_favorites);

    mTitle = mDrawerTitle = getTitle();

    // load slide menu items
    navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

    // nav drawer icons from resources
    navMenuIcons = getResources()
            .obtainTypedArray(R.array.nav_drawer_icons);

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

    navDrawerItems = new ArrayList<NavDrawerItem>();

    // adding nav drawer items to array
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1), true, "3"));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuIcons.getResourceId(7, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[8], navMenuIcons.getResourceId(8, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[9], navMenuIcons.getResourceId(9, -1)));


    // Recycle the typed array
    navMenuIcons.recycle();

    mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

    // setting the nav drawer list adapter
    adapter = new NavDrawerListAdapter(getApplicationContext(),
            navDrawerItems);
    mDrawerList.setAdapter(adapter);

    // enabling action bar app icon and behaving it as toggle button
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);

    // Calling async task to get json
    new GetJson().execute();

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer, //nav menu toggle icon
            R.string.app_name, // nav drawer open - description for accessibility
            R.string.app_name // nav drawer close - description for accessibility
    ) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            // calling onPrepareOptionsMenu() to show action bar icons
            invalidateOptionsMenu();
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            // calling onPrepareOptionsMenu() to hide action bar icons
            invalidateOptionsMenu();
        }
    };

    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        // on first time display view for first nav item
        displayView(1);
    }
}

/**
 * Slide menu item click listener
 * */
public class SlideMenuClickListener implements
        ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        // display view for selected nav drawer item
        displayView(position);

    }





}

/**
 * Async task class to get json by making HTTP call
 * */
private class GetJson extends AsyncTask<Void, Void, Void> {

..。

Logcat：

01-29 10:00:29.573: E/AndroidRuntime(6923): FATAL EXCEPTION: main
01-29 10:00:29.573: E/AndroidRuntime(6923): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.begital.vitalis/com.begital.vitalis.FavoritesActivity}: java.lang.NullPointerException
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.os.Looper.loop(Looper.java:137)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread.main(ActivityThread.java:4745)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at java.lang.reflect.Method.invoke(Method.java:511)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at dalvik.system.NativeStart.main(Native Method)
01-29 10:00:29.573: E/AndroidRuntime(6923): Caused by: java.lang.NullPointerException
01-29 10:00:29.573: E/AndroidRuntime(6923):     at com.begital.vitalis.FavoritesActivity.onCreate(FavoritesActivity.java:145)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.Activity.performCreate(Activity.java:5008)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-29 10:00:29.573: E/AndroidRuntime(6923):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
01-29 10:00:29.573: E/AndroidRuntime(6923):     ... 11 more