How can i use multiple implements?

Question

I'm making App with Android Studio.

I have a

public class MainActivity extends Activity implements View.OnClickListener, OnCheckedChangeListener

And I need to add "AppCompatActivity" to the MainActivity.

I have searched on the Internet and I found only one can be used for extends.

So I Changed to

public class MainActivity extends Activity implements View.OnClickListener, OnCheckedChangeListener, AppCompatActivity

This and AppCompatActivity has an error that "Interface expected here".

How can I solve this problem?

Answer 1

The AppCompatActivity is a class not an interface so you can't use implements keyword to inherit the AppCompatActivity

You need to use extends keyword to inherit the AppCompatActivity class

Use this

public class MainActivity extends AppCompatActivity implements View.OnClickListener, OnCheckedChangeListener

instead of

public class MainActivity extends Activity implements View.OnClickListener, OnCheckedChangeListener, AppCompatActivity