嘗試在我的活動中將SearchView小部件添加到ActionBar時遇到問題-調用getActionView獲取我的SearchView對象時，我得到一個空值。我一直在關注Android開發人員指南，還遇到了大量SO問題以及Internet上的其他一些鏈接；一切都無濟于事。它可能很簡單，但我無法弄清楚-在我看來，我的代碼與google的代碼基本相同（除了更改了一些名稱等），但仍然無法正常工作。任何幫助，將不勝感激。以下包括代碼的相關位。如果有任何不清楚的地方，請讓我知道?；顒哟a：    private ListView workflowListView;    private DrawerLayout drawerLayout;    private ListView drawerList;    private ActionBarDrawerToggle drawerToggle;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getWindow().requestFeature(Window.FEATURE_ACTION_BAR);        setContentView(R.layout.activity_workflow_list);        workflowListView = (ListView) findViewById(R.id.workflowListView);        drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);        drawerList = (ListView) findViewById(R.id.drawer_list);        drawerToggle = new ActionBarDrawerToggle(             this,                  /* host Activity */             drawerLayout,         /* DrawerLayout object */             R.drawable.ic_launcher,  /* nav drawer icon to replace 'Up' caret */             R.string.app_name,  /* "open drawer" description */             R.string.app_name  /* "close drawer" description */             ) {                /** Called when a drawer has settled in a completely closed state. */                public void onDrawerClosed(View view) {    //                getActionBar().setTitle("Closed drawer");                }                /** Called when a drawer has settled in a completely open state. */                public void onDrawerOpened(View drawerView) {    //                getActionBar().setTitle("Open drawer");                }       };