When I should hide a toolbar in an Android App?

1. What is the use of Toolbar in Android?
2. What is app Toolbar?
3. How to hide notification bar in Android programmatically?

What is the use of Toolbar in Android?

In Android applications, Toolbar is a kind of ViewGroup that can be placed in the XML layouts of an activity. It was introduced by the Google Android team during the release of Android Lollipop(API 21). The Toolbar is basically the advanced successor of the ActionBar.

What is app Toolbar?

The app bar, also known as the action bar, is one of the most important design elements in your app's activities, because it provides a visual structure and interactive elements that are familiar to users.

How to hide notification bar in Android programmatically?

Hide the Status Bar on Android 4.

View decorView = getWindow(). getDecorView(); // Hide the status bar. // status bar is hidden, so hide that too if necessary.