habitica-android/Habitica/res/menu/menu_main_activity.xml

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

    <!-- Search, should appear as action button -->
    <item android:id="@+id/action_search"
        android:icon="@drawable/ic_action_filter_list"
        android:title="filter"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_reload"
        android:icon="@drawable/ic_refresh_white"
        android:orderInCategory="103"
        app:showAsAction="ifRoom"
        />

</menu>