Add back and forward button to WebView

layout.xml

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        // This line positions the layout below AppBar
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <WebView
        android:id="@+id/webview_devotions"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

        <Button
            android:id="@+id/bt_back_devo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_alignParentBottom="true"
            android:enabled="false"
            android:text="@string/back" />
        <Button
            android:id="@+id/bt_forward_devo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:text="@string/forward"
            android:enabled="false" />
    </RelativeLayout>

WebViewWithBackForward

       webView = findViewById(R.id.webview_devotions);

        //Button Initialization
        backButton =(Button) findViewById(R.id.bt_back);
        forwardButton =(Button) findViewById(R.id.bt_forward);
        //Back Button Action
        backButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // Going back if canGoBack true
                if(webView.canGoBack()){
                    webView.goBack();
                }
            }
        });

        //Forward Button Action
        forwardButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // Go Forward if canGoForward is true
                if(webView.canGoForward()){
                    webView.goForward();
                }
            }
        });
        
        webView.setWebViewClient(new WebViewClient() {
                @Override
                public boolean shouldOverrideUrlLoading(WebView view, String url) {
                    if (document.hasAttr("footer")) {
                        document.getElementById("footer").remove();
                    } else if (document.hasClass("header")) {
                        document.getElementsByClass("header header-default").remove();
                    }
                    return false;
                }

                /**
                 * Notify the host application that the WebView will load the resource
                 * specified by the given url.
                 *
                 * @param view The WebView that is initiating the callback.
                 * @param url  The url of the resource the WebView will load.
                 */
                @Override
                public void onLoadResource(WebView view, String url) {
                    Log.d(TAG, "onLoadResource entered");
                }

                @Override
                public void onPageFinished(WebView mWebView, String url) {
                    Log.d(TAG, "onPagFinished entered");

                    //Make Enable or Disable buttons
                    backButton.setEnabled(mWebView.canGoBack());
                    forwardButton.setEnabled(mWebView.canGoForward());
                }