Can you use old actionbar in activity layout?

You can use either old ActionBar (without any declarations in XML) or define android.support.v7.widget.Toolbar in activity layout and customize it look and events (more coding in this way). Let's look at ActionBar and it's parameters.
Besides, how does an activity appear on the action bar?
An activity adds entries to the action bar in its onCreateOptionsMenu () method. The showAsAction attribute allows you to define how the action is displayed. For example, the ifRoom attribute defines that the action is only displayed in the action bar if there is sufficient screen space available.
Similarly, can you change the action bar in Android? Action bar just like header in android. Either we can use same action bar for all screen or we can change action bar for particular activity. This example demonstrate about how to create a custom action bar in Android.
Keeping this in consideration, how do I set up the activity Bar?
In the activity's onCreate() method, call the activity's setSupportActionBar() method, and pass the activity's toolbar. This method sets the toolbar as the app bar for the activity. Your app now has a basic action bar. By default, the action bar contains just the name of the app and an overflow menu.
Thereof, when to use a toolbar instead of an action bar?
Use a standalone Toolbar when you want to use the pattern in your app for situations that an ActionBar would not support; for example, showing multiple toolbars on the screen, spanning only part of the width, and so on.

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