How to add multiple implementations after AppCompatActivity?

Question

How to add multiple implementations after extending the AppCompatActivity?

Why am I getting this error? Please correct this piece of code.

public class MainActivity extends AppCompatActivity
    implements PopupMenu.OnMenuItemClickListener
    implements NavigationView.OnNavigationItemSelectedListener{

Answer 1

Change it to

public class MainActivity extends AppCompatActivity
    implements PopupMenu.OnMenuItemClickListener,  NavigationView.OnNavigationItemSelectedListener{

You should read this too.

Answer 2

You shouldn't use implements twice to do so, just use it like this:

public class MainActivity extends AppCompatActivity
     implements firstImplement, secondImplement {}