Android WebView in a ViewSwitcher loadUrl loads once - android-webview

Question

I have in my ViewSwitcher a ListView and a WebView. In my ListView's adapter, I have an onclick listener that writes the clicked url in the list to sharedpreferences. I'm trying to load that url into the WebView using an onSharedPreferencesChangedListener.
This is the code in my adapter:
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
viewSwitcher.showNext();
Settings.writeSettings(context, "webviewUrl",
urls.get(position));
}
});
return convertView;
And in the preference listener:
#Override
public void onSharedPreferenceChanged(SharedPreferences pref, String key) {
if (key.equals("webviewUrl")) {
Log.d("TAG", pref.getString(key, null));
WebView wv = (WebView) findViewById(R.id.rss_webview);
wv.getSettings().setJavaScriptEnabled(true);
wv.setWebViewClient(new MyWebViewClient());
wv.loadUrl("about:blank");
wv.loadUrl(pref.getString(key, null));
}
}
This works great except it only works once. The preference listener code logs the correct urls, and the code executes each time I want it to, but wv.loadUrl() method seems to do nothing after the first successful call. Can anyone explain to me why this is happening and perhaps offer a solution? Thanks.

Answer 1

I solved the problem by implementing a static ViewHolder on the WebView whose reference I needed to keep longer than its views' lifecycle.
private static final class WebViewHolder {
WebView wv;
}
#Override
public void onSharedPreferenceChanged(SharedPreferences pref, String key) {
WebViewHolder holder = new WebViewHolder();
if (key.equals("webviewUrl")) {
if (wv == null) {
wv = new WebView(this);
holder.wv = (WebView) findViewById(R.id.rss_webview);
holder.wv.getSettings().setJavaScriptEnabled(true);
holder.wv.setWebViewClient(new MyWebViewClient());
wv.setTag(holder);
} else {
holder = (WebViewHolder) wv.getTag();
}
holder.wv.loadUrl("about:blank");
holder.wv.loadUrl(pref.getString(key, null));
}
}