How to add colour to action bar button in android studio...

<item    android:id="@+id/action_setting"    android:title="Call Me"    android:iconTint="#ffffff"    android:icon="@android:drawable/sym_call_outgoing"    app:showAsAction="ifRoom"/>

these line is the different 

android:iconTint="#ffffff"

we use icon Tint to give any colour to our action bar button...thanks