Chrome Custom Tabs's Close Button Feature Override

Close button of 'chrome custom tab' close the entire webview itself. However I want it to override its behaviour to work as hardware back button behaviour so that user can go back

Solution 1:

In my case my application does nothing but open the Chrome Custom Tab, so I was able to do this:

// This is called on boot, and when the Chrome Custom Tab's X button in the top left is clicked.
protected void onResume() {
    super.onResume();
    tryLaunch();
}

where tryLaunch launches Chrome

Solution 2:

That's not currently possible.