public abstract class BaseFragment extends Fragment {

    public Activity mActivity;//这个activity就是MainActivity,可以用来获取Conrtent上下文对象

    // Fragment创建
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mActivity = getActivity();// 获取当前fragment所依赖的activity
    }

    // 初始化fragment的布局
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = initView();
        return view;
    }

    // fragment所依赖的activity的onCreate方法执行结束
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // 初始化数据
        initData();
    }

    // 初始化布局, 必须由子类实现
    public abstract View initView();

    // 初始化数据, 必须由子类实现
    public abstract void initData();
}