Not able to open default webpage in webview

I am new to android development, I have an application with a webview. This webview is inside my tablayout's framelayout. My tabs are showing up webpages proerly but but my default tab is displaying a blank screen. Here is my code which is implemented. Please help me to fix this problem.

private WebView webview;
private TabHost mTabHost;

public class HelloWebViewClient extends WebViewClient {
    @Override
   public boo开发者_运维知识库lean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);

    mTabHost = getTabHost();

    mTabHost.addTab(mTabHost.newTabSpec("tab_featured").setIndicator("Featured", getResources().getDrawable(R.drawable.featured_selected)).setContent(R.id.webview));
    mTabHost.addTab(mTabHost.newTabSpec("tab_recent").setIndicator("recent", getResources().getDrawable(R.drawable.recent_selected)).setContent(R.id.webview));
    mTabHost.addTab(mTabHost.newTabSpec("tab_playlist").setIndicator("playlist", getResources().getDrawable(R.drawable.playlist_selected)).setContent(R.id.webview));
    mTabHost.addTab(mTabHost.newTabSpec("tab_search").setIndicator("search", getResources().getDrawable(R.drawable.search_selected)).setContent(R.id.webview));

    mTabHost.setCurrentTab(0);

    webview = (WebView) findViewById(R.id.webview);

    webview.loadUrl("http://www.google.com");

    webview.setWebViewClient(new HelloWebViewClient());
    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setPluginsEnabled(true);
    webview.getSettings().setAllowFileAccess(true);

    mTabHost.setOnTabChangedListener(new OnTabChangeListener() {
        @Override
        public void onTabChanged(String tabId) {
            if(tabId.equals("tab_featured")){
                webview.loadUrl("http://www.facebook.com");
            }else if(tabId.equals("tab_recent")){
                webview.loadUrl("http://www.useit.com");
            }else if(tabId.equals("tab_playlist")){
                webview.loadUrl("http://www.flipkart.com");
            }else if(tabId.equals("tab_search")){
                webview.loadUrl("http://www.hotmail.com");
            }
        }  
    } );

Thanks in advance :)

Move

webview.loadUrl("http://www.google.com");

after this line

webview.getSettings().setAllowFileAccess(true);