title: How to lock navigation drawer?
body: <p>In my application  I am using navigation drawer and It works fine,but what I am trying to do is when Internet is not available user should not able to open navigation drawer,can any one help me how to solve this issue,the code for navigation drawer is given below..</p>
  
  <pre><code>public class MainActivity extends Activity {
  private DrawerLayout mDrawerLayout;
  private ListView mDrawerList;
  private ActionBarDrawerToggle mDrawerToggle;
  
  
      AlertDialogManager alert = new AlertDialogManager();
  
  
      SessionManager session;
  
  private CharSequence mDrawerTitle;
  
  
  private CharSequence mTitle;
  
  
  private String[] navMenuTitles;
  private TypedArray navMenuIcons;
  
  private ArrayList&lt;NavDrawerItem&gt; navDrawerItems;
  private NavDrawerListAdapter adapter;
  private String id;
  private boolean b;
  
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) 
  {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      session = new SessionManager(getApplicationContext());
  
      id = getIntent().getStringExtra("id");
  
      System.out.println("MAIN ID : " + id);
  
      mTitle = mDrawerTitle = getTitle();
  
  
      navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
  
  
      navMenuIcons = getResources()
              .obtainTypedArray(R.array.nav_drawer_icons);
  
      mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
      mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
  
  
      b = checkInternetConnection();
  
  
      if(b!=true)
      {
          //Toast.makeText(getApplicationContext(), "No Internet Available", Toast.LENGTH_SHORT).show();
  
          mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, mDrawerList);
      }
      else
      {
          System.out.println("Available");
  
      }
      navDrawerItems = new ArrayList&lt;NavDrawerItem&gt;();
  
  
      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)));
      // search
      navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
      // help
      navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
      //logout
  
      navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -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);
  
  
          getActionBar().setDisplayHomeAsUpEnabled(true);
              getActionBar().setHomeButtonEnabled(true);
      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(0);
      }
  }
  
  
  
  public boolean checkInternetConnection() {
      final ConnectivityManager conMgr = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE);
      if (conMgr.getActiveNetworkInfo() != null &amp;&amp; conMgr.getActiveNetworkInfo().isAvailable() &amp;&amp;    conMgr.getActiveNetworkInfo().isConnected()) {
            return true;
      } else {
            System.out.println("Internet Connection Not Present");
          return false;
      }
   }
  
  
  
  /*void Showtoast(String message) {
  Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();}
  private Boolean exit = false;*/
  @Override
  public void onBackPressed() {
      // TODO Auto-generated method stub
      /*if (exit) 
      {
          finish(); // finish activity
      } else 
      {
          Toast.makeText(this, "Press Back again to Exit.",
                  Toast.LENGTH_SHORT).show();
          exit = true;
          new Handler().postDelayed(new Runnable() 
          {
              @Override
              public void run()
              {
                  exit = false;
              }
          }, 3 * 1000);
  
      }*/
  
       AlertDialog.Builder ald = new AlertDialog.Builder(MainActivity.this);
          ald.setTitle("Exit");
          ald.setMessage("Are you sure you want to quit.?");
          ald.setPositiveButton("Ok", new DialogInterface.OnClickListener()
          {
              @Override
              public void onClick(DialogInterface dialog, int which) 
              {
                  moveTaskToBack(true);
                  android.os.Process.killProcess(android.os.Process.myPid());
                  System.exit(1);
              }
          });
  
          ald.setNegativeButton("Cancel", null);
          ald.show();
  }
  
  
  
  
  
  /**
   * Slide menu item click listener
   * */
  private class SlideMenuClickListener implements
          ListView.OnItemClickListener {
      @Override
      public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position,
              long id) {
          // display view for selected nav drawer item
          displayView(position);
      }
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // toggle nav drawer on selecting action bar app icon/title
      if (mDrawerToggle.onOptionsItemSelected(item)) {
          return true;
      }
      // Handle action bar actions click
      switch (item.getItemId()) {
      case R.id.action_settings:
          return true;
      default:
          return super.onOptionsItemSelected(item);
      }
  }
  
  
  @Override
  public boolean onPrepareOptionsMenu(Menu menu) {
      // if nav drawer is opened, hide the action items
      boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
      menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
      return super.onPrepareOptionsMenu(menu);
  }
  
  /**
   * Diplaying fragment view for selected nav drawer list item
   * */
  private void displayView(int position) {
      // update the main content by replacing fragments
      Fragment fragment = null;
      switch (position) {
      case 0:
          fragment = new HomeFragment();
  
          break;
      case 1:
          fragment = new FindPeopleFragment();
  
          break;
      case 2:
          fragment = new PhotosFragment();
  
          break;
      case 3:
          fragment = new CommunityFragment();
  
          break;
      case 4:
          fragment = new PagesFragment();
  
          break;
      case 5:
          fragment = new WhatsHotFragment();
  
          break;
  
      case 6:
          fragment=new Mylist();
  
          break;
  
      default:
          break;
      }
  
      if (fragment != null) {
          FragmentManager fragmentManager = getFragmentManager();
          fragmentManager.beginTransaction()
                  .replace(R.id.frame_container, fragment).commit();
  
          // update selected item and title, then close the drawer
          mDrawerList.setItemChecked(position, true);
          mDrawerList.setSelection(position);
          setTitle(navMenuTitles[position]);
          mDrawerLayout.closeDrawer(mDrawerList);
      } else {
          // error in creating fragment
          Log.e("MainActivity", "Error in creating fragment");
      }
  }
  
  @Override
  public void setTitle(CharSequence title) {
      mTitle = title;
      getActionBar().setTitle(mTitle);
  }
  
  /**
   * When using the ActionBarDrawerToggle, you must call it during
   * onPostCreate() and onConfigurationChanged()...
   */
  
  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
      super.onPostCreate(savedInstanceState);
      // Sync the toggle state after onRestoreInstanceState has occurred.
      mDrawerToggle.syncState();
  }
  
  @Override
  public void onConfigurationChanged(Configuration newConfig) {
      super.onConfigurationChanged(newConfig);
      // Pass any configuration change to the drawer toggls
      mDrawerToggle.onConfigurationChanged(newConfig);
  }
  </code></pre>