Why does the system back button of an android smartphone kick out of the app?

Question

Android

I have a simple webview application. When you walk through its pages, then you click on the system "Back", the application crashes, instead of the expected return to the previous page. Why is this happening and how can it be corrected?

Answer 1

Hello,
to redefine the behavior of the back button for your purposes, use the following method:

@Override
    public void onBackPressed() {
        if(webView.canGoBack() == true){
            webView.goBack();
        }else{
            super.onBackPressed();
        }
    }

Answer 2

Thanks