如何使我的ActionBar切換按鈕在我的應用程序中工作？

-2

這我有切換按鈕，在MainActivity

  mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, 
      R.drawable.humberg, //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); 
    // Drawer Item click listeners 
    mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      selectItemFromDrawer(position); 
     }

當我運行我的應用程序即時得到錯誤，如很遺憾，您APLLICATION已經停止被寫入了一段代碼.. }）;