吐血经验 ActionBar ActionView （解决点击按钮不Expand的问题）

 
@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.actionbar, menu);
        MenuItem searchItem = menu.findItem(R.id.action_search);
        MenuItemCompat.setOnActionExpandListener(searchItem, new MenuItemCompat.OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                Toast.makeText(MainActivity.this,"Expand",Toast.LENGTH_LONG);
                return true;
            }
            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                Toast.makeText(MainActivity.this,"Collapse",Toast.LENGTH_LONG);
                return true;
            }
        });
            return super.onCreateOptionsMenu(menu);
    }

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.actionbartest.MainActivity">
    <item

        android:id="@+id/action_search"

        android:icon="@drawable/search"

        app:actionViewClass="android.widget.SearchView"

        app:showAsAction="ifRoom|collapseActionView"

        android:title="Search" />
    <item
        android:id="@+id/action_compose"
        android:icon="@drawable/san"
        app:showAsAction="never"
        android:title="Compose"/>
    <item
        android:id="@+id/action_delete"
        android:icon="@drawable/san"
        app:showAsAction="never"
        android:title="Delete"/>
    <item
        android:id="@+id/action_settings"
        android:icon="@drawable/san"
        app:showAsAction="never"
        android:title="Overflow"/>

</menu>