How to prevent backtracking on android?

Question

JavaScript

I want the page to reload when I click back.
How to do it ?
Here's the version I came up with. But it seems to me that it is not stable, since the button numbers can be different.

window.onkeyup=function(ev){
      if(ev.keyCode==122){
        window.scrollTo(0,0);
        location.reload();
        ev.preventDefault();
        return false;
      }
    };

Answer 1

i use this piece of code if it is webview

webView.setOnKeyListener(new OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) { if(event.getAction() == KeyEvent.ACTION_DOWN) { WebView webView = (WebView) v; switch(keyCode) { case KeyEvent.KEYCODE_BACK: if(webView.canGoBack()) { webView.goBack(); return true; } break; } } return false; } });