67、activity中调用fragment内部自定义的方法

fragment：

/**
 * author: Created by zzl on 15/11/19.
 */
@SuppressLint("validFragment")
public class pushMealHistoryFragment extends Fragment {

    Context ctxt;
    View gridALl;
    public pushMealHistoryFragment(Context ctxt)
    {
        this.ctxt = ctxt;
    }

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

        gridALl = inflater.inflate(R.layout.fragment_push_meal_history, null);

        return gridALl;
    }

    public void updateGridview()
    {
        final GridView gridviewHistory = (GridView)gridALl.findViewById(R.id.gridview_pushing_history);
        final Button btnBackground = (Button)gridALl.findViewById(R.id.empty_meal_done_history_gridview);

        ApisManager.getMealPushedHistory(CommonUtils.getFormatDate(0), new ApiCallback() {
            @Override
            public void success(final Object object) {

                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        HandlerUtils.showToast(ctxt, "hello,i'm refreshing...");
                        List<PushHistoryFood> list = (List<PushHistoryFood>) object;
                        PushHistoryAdapterr adapter = new PushHistoryAdapterr(ctxt, list);
                        gridviewHistory.setAdapter(adapter);
                        if (list.size() == 0) {
                            btnBackground.setVisibility(View.VISIBLE);
                        } else {
                            btnBackground.setVisibility(View.INVISIBLE);
                        }
                    }
                });

            }

            @Override
            public void error(BaseApi.ApiResponse response) {

            }
        });
    }

}

如果要在activity中调用上面的fragment的updateGridview方法，demo:

/**
 * author: Created by zzl on 15/11/19.
 */
public class PushMealActivity extends BaseActivity {

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mealdone);
        init();
    }

  public void init()
 {

   Fragment fragmentPushMealHistory = new pushMealHistoryFragment(ctxt);
    //在这里调用fragmentPushMealHistory的updateGridview方法
   ((pushMealHistoryFragment)fragmentPushMealHistory).updateGridview();

 }        

}

2015.11.27更新：

根本原因是fragmentPushMealHistory定义的类型为Fragment，如果为pushMealHistoryFragment，则不需要做强制转换了