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有谁知道如何隐藏AppCompat v21 searchview中的后退按钮？(绿线概述)

我搜索了很多但找不到任何有用的东西.

menu_main.xml:

<item android:id="@+id/search"
        android:title="@string/search_title"
        app:showAsAction="always|collapseActionView"
        android:icon="@drawable/abc_ic_search_api_mtrl_alpha"
        android:orderInCategory="300"
        app:actionViewClass="android.support.v7.widget.SearchView" />

<item android:id="@+id/action_home"
    android:title="Home"
    android:icon="@drawable/v_home"
    app:showAsAction="always"
    android:orderInCategory="180"/>

<item android:id="@+id/action_favorites"
    android:title="Favorites"
    android:icon="@drawable/v_favorites"
    app:showAsAction="always" />

主要活动:

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_main, menu);

        firstMenu = menu;


        searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

        MenuItem searchItem = menu.findItem(R.id.search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        searchView.setSubmitButtonEnabled(true);
        searchView.setActivated(true);


        searchView.setOnSearchClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) …