title: MainActivity is not abstract and does not override abstract method onPageStarted(String,Bitmap) in Listener
body: <p>I'm trying to show a html file with <a href="https://github.com/delight-im/Android-AdvancedWebView" rel="nofollow noreferrer">AdvancedWebView</a> component. But the problem is, it shows an error for the line </p>
  
  <pre><code>public class MainActivity extends Activity implements AdvancedWebView.Listener {
  </code></pre>
  
  <p>The error says, </p>
  
  <blockquote>
    <p>Error:(18, 8) error: MainActivity is not abstract and does not
    override abstract method onPageStarted(String,Bitmap) in Listener</p>
  </blockquote>
  
  <p>This is my <strong>MainActivity.java</strong> file.</p>
  
  <pre><code>package com.test.test3;
  import android.annotation.SuppressLint;
  import android.app.Activity;
  import android.content.Intent;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View;
  import android.widget.Toast;
  
  import im.delight.android.webview.AdvancedWebView;
  
  public class MainActivity extends Activity implements AdvancedWebView.Listener {
      private AdvancedWebView mWebView;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          mWebView = (AdvancedWebView) findViewById(R.id.webview);
          mWebView.setListener(this, this);
          mWebView.setGeolocationEnabled(false);
          mWebView.setMixedContentAllowed(true);
          mWebView.setCookiesEnabled(true);
          mWebView.setThirdPartyCookiesEnabled(true);
  
          mWebView.addHttpHeader("X-Requested-With", "");
          mWebView.loadUrl("file:///android_asset/index.html");
      }
  }
  </code></pre>
  
  <p>What I'm doing wrong or missing here?</p>