WebView calling setContentView bug

Issue

Okay, since it usually takes about 2 seconds for my WebView to load the page, I decided to display a "Loading" screen for my users. I found a very nice library called Shimmer that displays an animated textview. When my webview begins loading the page, I call setContentView to the shimmer layout and when it's done I call setContentView to the webview again. The problem is that the WebView is blank when I call setContentView. Why is that?

This is my code:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);

        WebView webView = (WebView) findViewById(R.id.webview);
        webView.setWebViewClient(new WebViewClient(){
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon)
            {
                // TODO show you progress image
                super.onPageStarted(view, url, favicon);
                Log.i("WEBVIEW", "Loading");
                shimmer = new Shimmer();
                setContentView(R.layout.shimmer);
                ShimmerTextView shimmerTextView = (ShimmerTextView) findViewById(R.id.shimmer_tv);
                shimmer.start(shimmerTextView);
            }

            @Override
            public void onPageFinished(WebView view, String url)
            {
                // TODO hide your progress image
                super.onPageFinished(view, url);
                Log.i("WEBVIEW", "Loading Done");
                shimmer.cancel();
                setContentView(R.layout.webview);
            }
        });
        webView.loadUrl(url);

Solution

I am pretty sure you are implementing the Shimmer wrong. You should not call setContentView() more than once.

You should do something like this:

1) Add a Fragment that contains your WebView and make it load the url.

2) Add a Fragment that contains the Shimmer View and start Shimmer after you inflate the View of the Fragment in onCreateView().

3) When the WebView finishes loading, use an event bus like Otto to let the Activity that contains Shimmer Fragment know to remove it.

Answered By - Emmanuel