FloatingActionButton setVisibility() not working

For FloatingActionButton the setVisibility() method will give you an error while building with the latest Gradle 6.x and build-tool 28.x.x and is not encouraged any more. Instead, use:

fab.hide()    // fab.setVisibility(View.GONE)
fab.show()    // fab.setVisibility(View.VISIBLE)

Note: Succesfully tested on Android Studio 3.4.1, Gradle 6.0 and build-tool 28.0.1

Use show and hide methods to show and hide the Floating Action Button

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

// To show the Floating Action Button
fab.show();

// To hide the Floating Action Button
fab.hide();