How to make the three dots appear in the Android toolbar
问题 I am new in Android applications development, and I am trying to develop an application in UI I added a toolbar but In don't know why the three dots in the right side of the toolbar, it is necessary for me because I want to add a logout button there. here is the toolbar layout: <?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android