How to refresh list of the navigation drawer as soon as its open/closed in Android

I have created navigation drawer and displaying items in list. My list is static but i am displaying points. So when users select the items in the list and do some activity he get the points. So i want to update the points as soon as he gets. How can i do this./ Below is my code: Activity Class: ``` @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.home_page); // Initializing dataList = new ArrayList<DrawerItem>(); mTitle = mDrawerTitle = getTitle(); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); sharedPreferences = getSharedPreferences(Constant.LOGIN_CHECK, Constant.PRIVATE_MODE); editSharedPreferences = sharedPreferences.edit(); if (sharedPreferences.getBoolean(Constant.IS_ALREADY_LOGIN, false)) { loginInBackground(); } String p1 = sharedPreferences.getString(Constant.USERS_POINTS, ""); String p2 = sharedPreferences.getString( Constant.LEVEL_ONE_POINTS, ""); String p3 = sharedPreferences.getString( Constant.LEVEL_TWO_POINTS, ""); String pointText = " POINTS"; dataList.add(new DrawerItem("OVERVIEW", R.drawable.ic_action_eye, Color.DKGRAY, Color.TRANSPARENT)); dataList.add(new DrawerItem("EARN POINTS", R.drawable.ic_action_dollor, Color.GREEN, Color.TRANSPARENT)); dataList.add(new DrawerItem("MY POINTS ", p1 + pointText, Color.BLACK, Color.BLACK)); dataList.add(new DrawerItem("REFERRALS POINTS LV1 ", p2 + pointText, Color.BLACK, Color.BLACK)); dataList.add(new DrawerItem("REFERRALS POINTS LV2 ", p3 + pointText, Color.BLACK, Color.BLACK)); dataList.add(new DrawerItem("WITHDRAW REWARDS", R.drawable.ic_action_home, Color.DKGRAY, Color.TRANSPARENT)); dataList.add(new DrawerItem("MY PROFILE", R.drawable.ic_action_settings, Color.DKGRAY, Color.TRANSPARENT)); dataList.add(new DrawerItem("HELP", R.drawable.help_d, Color.DKGRAY, Color.TRANSPARENT)); adapter = new CustomDrawerAdapter(this, R.layout.custom_drawer_item, dataList); mDrawerList.setAdapter(adapter); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) { public void onDrawerClosed(View view) { getActionBar().setTitle(mTitle); invalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(mDrawerTitle); invalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { SelectItem(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { String pointsLeft = sharedPreferences.getString( Constant.POINTS_LEFT, ""); getMenuInflater().inflate(R.menu.main, menu); this.menu = menu; MenuItem pointsMenu = menu.findItem(R.id.action_settings); pointsMenu.setTitle(pointsLeft + " Points"); return true; } public void SelectItem(int possition) { Fragment fragment = null; Bundle args = new Bundle(); switch (possition) { case 0: fragment = new FragmentWelcome(); args.putString(FragmentWelcome.ITEM_NAME, dataList.get(possition) .getItemName()); args.putInt(FragmentWelcome.IMAGE_RESOURCE_ID, dataList.get(possition).getImgResID()); fragment.setArguments(args); FragmentManager frgManager0 = getFragmentManager(); frgManager0.beginTransaction() .replace(R.id.content_frame, fragment).commit(); break; case 1: fragment = new FragmentAppList(); args.putString(FragmentWelcome.ITEM_NAME, dataList.get(possition) .getItemName()); args.putInt(FragmentWelcome.IMAGE_RESOURCE_ID, dataList.get(possition).getImgResID()); fragment.setArguments(args); FragmentManager frgManager1 = getFragmentManager(); frgManager1.beginTransaction() .replace(R.id.content_frame, fragment).commit(); break; case 5: fragment = new FragmentRedeemPoints(); args.putString(FragmentWelcome.ITEM_NAME, dataList.get(possition) .getItemName()); args.putInt(FragmentWelcome.IMAGE_RESOURCE_ID, dataList.get(possition).getImgResID()); fragment.setArguments(args); FragmentManager frgManager2 = getFragmentManager(); frgManager2.beginTransaction() .replace(R.id.content_frame, fragment).commit(); break; case 6: fragment = new SettingsFragment(); args.putString(FragmentWelcome.ITEM_NAME, dataList.get(possition) .getItemName()); args.putInt(FragmentWelcome.IMAGE_RESOURCE_ID, dataList.get(possition).getImgResID()); fragment.setArguments(args); FragmentManager frgManager6 = getFragmentManager(); frgManager6.beginTransaction() .replace(R.id.content_frame, fragment).commit(); break; case 7: fragment = new HelpFragment(); args.putString(FragmentWelcome.ITEM_NAME, dataList.get(possition) .getItemName()); args.putInt(FragmentWelcome.IMAGE_RESOURCE_ID, dataList.get(possition).getImgResID()); fragment.setArguments(args); FragmentManager frgManager7 = getFragmentManager(); frgManager7.beginTransaction() .replace(R.id.content_frame, fragment).commit(); break; default: break; } mDrawerList.setItemChecked(possition, true); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } return false; } private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { SelectItem(position); } } ``` CustomDrawerAdapter: ``` public class CustomDrawerAdapter extends ArrayAdapter<DrawerItem> { Context context; List<DrawerItem> drawerItemList; int layoutResID; public CustomDrawerAdapter(Context context, int layoutResourceID, List<DrawerItem> listItems) { super(context, layoutResourceID, listItems); this.context = context; this.drawerItemList = listItems; this.layoutResID = layoutResourceID; } @SuppressWarnings("static-access") @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub DrawerItemHolder drawerHolder; View view = convertView; if (view == null) { LayoutInflater inflater = ((Activity) context).getLayoutInflater(); drawerHolder = new DrawerItemHolder(); view = inflater.inflate(layoutResID, parent, false); drawerHolder.ItemName = (TextView) view .findViewById(R.id.drawer_itemName); drawerHolder.icon = (ImageView) view.findViewById(R.id.drawer_icon); drawerHolder.pointsText = (TextView) view .findViewById(R.id.get_login); drawerHolder.divider = view.findViewById(R.id.dividerView); drawerHolder.itemLayoutColor = (LinearLayout) view .findViewById(R.id.itemLayoutColor); view.setTag(drawerHolder); } else { drawerHolder = (DrawerItemHolder) view.getTag(); } DrawerItem dItem = (DrawerItem) this.drawerItemList.get(position); if (dItem.getPointText() == null) { drawerHolder.icon.setImageDrawable(view.getResources().getDrawable( dItem.getImgResID())); drawerHolder.pointsText.setVisibility(view.GONE); } else { drawerHolder.pointsText.setText(dItem.getPointText()); } drawerHolder.itemLayoutColor.setBackgroundColor(dItem.layoutColorCode); drawerHolder.divider.setBackgroundColor(dItem.colorCode); drawerHolder.ItemName.setText(dItem.getItemName()); return view; } private static class DrawerItemHolder { TextView ItemName; ImageView icon; TextView pointsText; View divider; LinearLayout itemLayoutColor; } } ```