invalidateOptionsMenu();使原填充的菜單項(xiàng)無(wú)效，當(dāng)用戶再次訪問(wèn)菜單時(shí)，再次調(diào)用onCreateOptionsMenu(Menu menu)。如果我們要每次訪問(wèn)都重新對(duì)菜單進(jìn)行處理，使用onPrepareOptionsMenu()來(lái)替代onCreateOptionsMenu()

菜單文件和SearchView：搜索框 的使用

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.actions,menu);
    SearchView searchView = (SearchView) menu.findItem(R.id.app_bar_search).getActionView();
    searchView.setOnQueryTextListener(new QueryTextListener());
    return true;
}

public class QueryTextListener  implements SearchView.OnQueryTextListener{
    @Override
    public boolean onQueryTextSubmit(String query) {
        Toast.makeText(ActionBarUseageActivity.this, "Searching for: " + query + "...", Toast.LENGTH_SHORT).show();
        return true;
    }
    @Override
    public boolean onQueryTextChange(String newText) {
        newText = newText.isEmpty() ? "" : "Query so far: " + newText;
        tvSearchPre.setText(newText);
        return true;
    }
}

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/app_bar_search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        android:icon="@drawable/ic_search_black_24dp"
        android:title="Search"
        app:showAsAction="ifRoom"/>
    <item
        android:id="@+id/app_bar_edit"
        android:icon="@android:drawable/ic_menu_edit"
        android:title="Edit"
        app:showAsAction="always"/>
    <item
        android:id="@+id/app_bar_sort"
        android:icon="@android:drawable/ic_menu_sort_by_size"
        android:title="Sort"
        app:showAsAction="ifRoom">
        <menu>
            <item
                android:id="@+id/action_sort_size"
                android:icon="@android:drawable/ic_menu_sort_by_size"
                android:title="By Size"/>
            <item
                android:id="@+id/action_sort_alpha"
                android:icon="@android:drawable/ic_menu_sort_alphabetically"
                android:title="Alphabetically"/>
        </menu>
    </item>
</menu>

另外的用法

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    //將搜索框加入ActionBar
    MenuItem item = menu.add("Search");
    //設(shè)置SearchView的圖標(biāo)
    item.setIcon(android.R.drawable.ic_menu_search);
    //設(shè)置ActionItem的顯示方式
    item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM|MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
    //使用自定義的SearchView以便更好的控制
    mSearchView = new MySearchView(getActivity());
    //設(shè)置文本改變的監(jiān)聽(tīng)器
    mSearchView.setOnQueryTextListener(this);
    //設(shè)置可刪除文本的監(jiān)聽(tīng)器
    mSearchView.setOnCloseListener(this);
    //設(shè)置圖標(biāo)是否顯示在文本的旁邊，還是作為背景
    mSearchView.setIconifiedByDefault(true);
    //將SearchView作為ActionItem的選項(xiàng)
    item.setActionView(mSearchView);
}