Toolbar icon tinting on Android

Another option is to use the new support for vector drawables in the support library.

See res/xml/ic_search.xml in blog post AppCompat — Age of the vectors

Notice the reference to ?attr/colorControlNormal

<vector xmlns:android="..."
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0"
    android:tint="?attr/colorControlNormal">
    <path
        android:pathData="..."
        android:fillColor="@android:color/white"/>
</vector>