当从底部导航选择时，如何阻止片段重新加载WebView？

public class MyFragment extends Fragment {
    private WebView webView;
    private WebViewState webViewState;

    // ...

    @Override
    public void onPause() {
        super.onPause();
        webViewState = new WebViewState();
        webView.saveState(webViewState);
    }

    @Override
    public void onResume() {
        super.onResume();
        webView.restoreState(webViewState);
    }

    // ...

    public void switchFragment(Fragment targetFragment) {
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.hide(this);
        transaction.show(targetFragment);
        transaction.commit();
    }
}