<item
       android:id="@+id/menu_search"
       android:actionLayout="@layout/searchview"//自定义
       android:icon="@drawable/ic_action_search"
       android:showAsAction="always|collapseActionView"
       android:title="Search"/>
       android:actionViewClass="android.widget.SearchView"//系统的

我们设定 showAsAction这个属性的时候，加了collapseActionView这么一个参数，它的意思是说，将item引用的布局隐藏起来，当你点击该item的时候，再将其展现出来。通过这个属性，我们就可以将每个item复杂的布局隐藏起来，从而有效的节约了actionbar的布局空间。

searchview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <EditText
        android:id="@+id/search"
        style="@android:style/Widget.Holo.EditText"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:hint="搜索视频"
        android:imeOptions="actionSearch"
        android:singleLine="true"
        android:textColor="@android:color/black"
        android:textCursorDrawable="@null" />
</LinearLayout>

代码

@Override
public boolean onCreateOptionsMenu(Menu menu) {
	// Inflate the menu; this adds items to the action bar if it is present.
	getMenuInflater().inflate(R.menu.activity_main, menu);
	initSearch(menu);
	return true;
}
private VideoFragment videoFragment;
/**
 * 搜索动作
 * 
 * @param menu
 */
private void initSearch(Menu menu) {
	MenuItem item = menu.findItem(R.id.menu_search);
	View view = item.getActionView();
	final EditText search = (EditText) view.findViewById(R.id.search);
	MenuItemCompat.setOnActionExpandListener(item,
			new OnActionExpandListener() {
				@Override
				public boolean onMenuItemActionCollapse(MenuItem item) {
					// Toast.makeText(MainDrawerActivity.this, "啊哦，我隐藏起来了！",
					// Toast.LENGTH_SHORT).show();
					search.clearFocus(); // 清除焦点
					AppUtil.hideSoftInput(MainDrawerActivity.this);
					if (search.getText().length() > 0) {// 重新恢复搜索之前的数据
						videoFragment.searchVideoTable(false, "");//
					}
					return true;
				}
				@Override
				public boolean onMenuItemActionExpand(MenuItem item) {
					// Toast.makeText(MainDrawerActivity.this, "啦啦啦，我出现喽！",
					// Toast.LENGTH_SHORT).show();
					search.requestFocus(); // 请求获取焦点
					/**
					 * 调起软键盘
					 */
					InputMethodManager m = (InputMethodManager)     getSystemService(Context.INPUT_METHOD_SERVICE);
					m.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
					return true;
				}
			});
	search.setOnEditorActionListener(new OnEditorActionListener() {
		@Override
		public boolean onEditorAction(TextView v, int actionId,
				KeyEvent event) {
			if (actionId == EditorInfo.IME_ACTION_SEARCH) {
				if (search.getText().length() > 0) {// 搜索
					AppUtil.hideSoftInput(MainDrawerActivity.this);
					videoFragment.searchVideoTable(true, search.getText()
							.toString());
				}
				return true;
			}
			return false;
		}
	});
}