add `app:iconTint="@color/yourcolor"` in your `MenuItem` for change the Icon color.
<item
android:icon="@drawable/ic_share_white_24dp"
android:id="@+id/action_share"
android:title="@string/action_share"
android:orderInCategory="200"
app:iconTint="@color/yourcolor"
app:showAsAction="ifRoom"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider"/>
add **app:itemTextColor="#fff"** in your NavigationView like
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:menu="@menu/slider_menu"
android:background="@color/colorAccent"
app:itemTextColor="#fff"
android:id="@+id/navigation_view"
android:layout_gravity="start"/>
