How to reset the Toolbar position controlled by the CoordinatorLayout?

Question

The app I\'m working on consists of a Navigation Drawer which is implemented in an Activity. The activity layout is as follows:

Answer 1

As document said

AppBarLayout supports
void setExpanded (boolean expanded, boolean animate);
Sets whether this AppBarLayout is expanded or not.

• expanded boolean: true if the layout should be fully expanded, false if it should be fully collapsed
• animate boolean: Whether to animate to the new state

So first, you need

AppBarLayout appBarLayout = findViewById(R.id.appBarLayout);

then to expand layout

appBarLayout.setExpanded(true, true); // with animation
appBarLayout.setExpanded(true, false); // without animation  

and to collapse layout

appBarLayout.setExpanded(false, true); // with animation
appBarLayout.setExpanded(false, false); // without animation 

Answer 2

First get a AppBarLayout refrence in you MainActivity, then in the pause state of the fragment that is being replaced, use the method below to expand toolbar :

MainActivity.appbar.setExpanded(true,true);

And or to close the toolbar :

MainActivity.appbar.setExpanded(false,true);

The second parameter is used to scroll the toolbar smoothly.