layout for edittext
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <EditText
        android:id="@+id/edittext_search"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>


menu
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      tools:context=".MainActivity">
      <item android:id="@+id/search_item"
            android:icon="@drawable/abs__ic_search"
            android:orderInCategory="0"
            android:title="@string/search_menuitem_titile"/>
<!--            android:actionLayout="@layout/search_layout" -->

</menu>


and code in Activity:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getSupportMenuInflater().inflate(R.menu.menu_main, menu);

    menu.getItem(0).setActionView(R.layout.search_layout);
    menu.getItem(0).setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);

    etSearch = (EditText)menu.getItem(0).getActionView().findViewById(R.id.edittext_search);

    etSearch.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            Log.d(TAG, "s");
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });
    MenuItem menuSearch = menu.findItem(R.id.search_item);
    menuSearch.setOnActionExpandListener(new MenuItem.OnActionExpandListener() {
        @Override
        public boolean onMenuItemActionExpand(MenuItem menuItem) {
            Log.d(TAG, "onMenuItemActionExpanded");
            etSearch.requestFocus();
            InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
            return false;
        }

        @Override
        public boolean onMenuItemActionCollapse(MenuItem menuItem) {
            Log.d(TAG, "onMenuItemActionCollapse");
            etSearch.clearFocus();
            return false;
        }
    });
    return super.onCreateOptionsMenu(menu);
}