title: Extending from more classes
body: <pre><code>...
  import android.app.ListActivity;
  import android.support.v7.app.AppCompatActivity;
  
  public class MainActivity extends ListActivity implements AppCompatActivity {
  
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          Toolbar toolbar = (Toolbar) findViewById(R.id.tool_bar);
          setSupportActionBar(toolbar);    
      }
  
      //other methods where I make use of ListActivity
  }
  </code></pre>
  
  <p>I get "Interface expected here" error on "implements AppCompactActivity".
  I've already read many posts reguarding similar issues where it's been said to create an interface, but I can't really figure out how to do it on my code.</p>