toolbar searchview

activity.java

private void configureSearchView(Menu menu) {
        MenuItem searchItem = menu.findItem(R.id.action_search);
        searchViewAction = (SearchView) MenuItemCompat.getActionView(searchItem);
        searchViewAction.setOnQueryTextListener(this);
        searchViewAction.setOnCloseListener(this);
        searchViewAction.setSubmitButtonEnabled(false);
        searchViewAction.setIconifiedByDefault(true);
        EditText editText = (EditText)  searchViewAction.findViewById(android.support.v7.appcompat.R.id.search_src_text);
        editText.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {/** empty method **/}

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,int after) {/** empty method **/}

        @Override
        public void afterTextChanged(Editable s) {
            mAdapter.getFilter().filter(s);
        }
    });
}

menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" >

    
  <!-- Search, should appear as action button -->

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

    <item
        android:id="@+id/action_title"
        app:showAsAction="always"
        android:icon="@drawable/check_icon"
        android:title="@string/title"/>

<!--  -->
</menu>