问片段活动不能强制转换为app.Activity。

EN

07-30 20:54:05.950: ERROR/AndroidRuntime(7816): Caused by: java.lang.ClassCastException: com.fttech.gameIT.shopping_details_fragment cannot be cast to android.app.Activity

  public class shoppingClass extends FragmentActivity{
Button findIT;
EditText game;
String item = null;
WebView browser;
RadioGroup site;
RadioGroup type;
String url;
String console;
shopping_details_fragment shopping;

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.shopping);

    findIT = (Button)findViewById(R.id.findIT);
    shop = (EditText)findViewById(R.id.item);
    type = (RadioGroup)findViewById(R.id.console);
    site = (RadioGroup)findViewById(R.id.shopping_group);

    final Intent d = new Intent(this, shopping_details_fragment.class);
    findIT.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            getUserPreference();
            shopping.loadUrl(url);
            startActivity(d);


        }
    });

  }

public class shopping_details_fragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){

    //Return the view for our WebView
    return(inflater.inflate(R.id.browserFrag,container, false));

}

public void loadUrl(String url){
    ((WebView)getView().findViewById(R.id.browser)).loadUrl(url);
}