Android WebView无法维护历史记录

public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE)
{
    gameDetailsActivity = (GameDetailsActivity)getActivity();

    Bundle args = getArguments();
    int type = args.geTint(ARG_OBjeCT);
    View rootView = null;

    rootView = inflater.inflate(R.layout.gamedetailswebview,container,falsE);

    wv = (WebView) rootView.findViewById(R.id.WebViewGameDetails);

    wv.setWebViewClient(new WebViewClient());
    wv.getSetTings().setJavaScriptEnabled(true);
    wv.getSetTings().setPluginState(WebSetTings.PluginState.oN_DEMAND);
    wv.getSetTings().setBuilTinZoomControls(true); 
    wv.getSetTings().setSupportZoom(true);
    wv.getSetTings().setJavaScriptCanOpenWindowsAutomatically(true);   
    wv.getSetTings().setAllowFileAccess(true); 
    wv.getSetTings().setDomStorageEnabled(true);

    switch (typE)
    {
        case 1:
            wv.loadUrl(gameDetailsActivity.gameSumMaryURL);
            break;
        case 2:
            wv.loadUrl(gameDetailsActivity.gameReportURL);
            break;
    }

    return rootView;
}

public Boolean GoBACk()
{
    if (wv.canGoBACk())
    {
        wv.goBACk();
        return true;
    }

    return false;
}

@Override
public void onBACkPressed()
{
    int currentFragmenTindex = gameDetailsViewPager.getCurrentItem();

    if (currentFragmenTindex > 0)
    {
        Fragment webview = gameDetailsPagerAdapter
                .getItem(currentFragmenTindeX);
        if (webview instanceof GameDetailsWebViewFragment)
        {
            if (!((GameDetailsWebViewFragment) webview).GoBACk())
            {
                super.onBACkPressed();
            }
        }
    }
}