public interface DrawerListener {
    void onDrawerSlide(View var1, float var2);

    void onDrawerOpened(View var1);

    void onDrawerClosed(View var1);

    void onDrawerStateChanged(int var1);
  }

toggle = new ActionBarDrawerToggle(
    this,         /* host Activity */
    mDrawerLayout,     /* DrawerLayout object */
    R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
    R.string.drawer_open, /* "open drawer" description for accessibility */
    R.string.drawer_close /* "close drawer" description for accessibility */
    ) {
  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()
  }
};

private void initActionBar() {　　　　

 // enable ActionBar app icon to behave as action to toggle nav drawer
    ActionBar actionBar = getActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setHomeButtonEnabled(true);
  } 

@Override
  protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
     toggle.syncState();
  }

  @Override
  public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Pass any configuration change to the drawer toggls
     toggle.onConfigurationChanged(newConfig);
  }

  @Override
  public boolean onOptionsIwotemSelected(MenuItem item) {
    // The action bar home/up action should open or close the drawer.
    // ActionBarDrawerToggle will take care of this.
     if (toggle.onOptionsItemSelected(item)) {
     return true;
     }
    return super.onOptionsItemSelected(item);
  }