Problems with WebViewClient and onKeyDown

Question

I'm currently trying to make a WebView based app.

This is the code I currently have:

    WebView webview = new WebView(this);
    setContentView(webview);

    WebView webView = (WebView) findViewById(R.id.myWebView);
    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setLoadsImagesAutomatically(true);

    webView.setWebViewClient(new NewWebViewClient());
    webview.loadUrl("http://google.com");

And the "NewWebViewClient" class is under this also in the MainActivity.java

public class NewWebViewClient extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {

        view.loadUrl(url);
        return true;
    }
}

There is no error shown by Android Studio. But if I want to start the app on my smartphone it just crashes.

The same Problem I have with this:

public void onKeyDown() {
    WebView webView = (WebView) findViewById(R.id.myWebView);

    if (webView.copyBackForwardList().getCurrentIndex() > 0) {
        webView.goBack();
    }

    else {
        super.onBackPressed();
    }

}

Does anyone know how I get this both things get working?

EDIT:

It still crashes:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.webkit.WebView.setWebViewClient(android.webkit.WebViewClient)' on a null object reference

Answer 1

Try this

 @Override
public void onBackPressed() {
        WebView webView = (WebView) findViewById(R.id.myWebView);
    if(webView!=null)
               {
                  if(webView.canGoBack())
                    {
                        webView.goBack();
                    }
            else
                {
                  super.onBackPressed();
                }
           }
   }

After reading ur question, i think u need to perform go back when the user press the back button... If thatz whats u luking for u can use the above code...

And replace

 WebView webview = new WebView(this);

with

WebView webView = (WebView) findViewById(R.id.myWebView);