[Android] WebView back button

LegalFragment.java

// Handles back button inside WebView.
// When user clicks back button and web history is not empty shows previous page from history.
mWebView.setOnKeyListener( new View.OnKeyListener() {
	@Override
        public boolean onKey( View v, int keyCode, KeyEvent event ) {
        	if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
        		mWebView.goBack();
                	return true;
       		}

        	return false;
        }
});

It is not working, Please try to update.