I can not find the toolbar in the layout editor in Android Studio

Question

I am trying to make a tutorial for Android developers.

They refer to the toolbar in the layout editor, in the training image it looks like this:

But this is what I see

.

Missing toolbar with eye. As you can see, the menu has a "Toolbar" -Icon, but clicking on it does not affect.

I use Android Studio 2.3 and follow the previous tutorial lessons as required. How can I activate this toolbar?

This is the link to create the Android user interface .

Answer 1

. , . , (: - > v2.2):

activity_main.xml . , Linear_Layout Relative_Layout. " ". .
: .

, . .

Answer 2

activity_main.xml content_main.xml. Android Studio 1.4. activity_main.xml - , content_main.xml :

<include layout="@layout/content_main" />

, open activity_main.xml, "". Activity_main TextView, , , .

: " " 1 content_main.xml activity_main.xml. .

activity_main.xml content_main.xml . content_main.xml android studio 1.4?

Answer 3

v7 appcompat gradle. android.support.v7.widget.Toolbar xml.