GitHub: https://github.com/Pulimet/ScrollViewEventTest

First in onCreate() we will set our WebView:

private WebView mWebView;
private ScrollView mScrollView;
public static final long DELAY_TIME = 1000;
private long mTime;
...
mWebView = findViewById(R.id.webView);
mWebView.loadUrl("http:///alex.srv1043500.hstgr.cloud");

Enable JavaScript:

WebSettings webViewSettings = mWebView.getSettings();
webViewSettings.setJavaScriptEnabled(true);

Create a method that would invoke our JavaScript code:

private void invokeJavaScriptCode(String code) {
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    mWebView.evaluateJavascript(code, null);
  } else {
    mWebView.loadUrl(String.format("javascript:%s", code));
  }
}

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