我在一个Fragment里面嵌套了一个FrameLayout,然后里面是有两个GridView，但是我写完后发现，这两个GridView都不会上下滑动了，数量是绝对足够用来下拉的，以下是代码： 两个显示的GridView我单独试过了，数据还有下拉什么都是正常，但是放到这里面就出问题了，显示没问题，就是没有下拉效果了，新人不怎么会写，求大佬们帮帮忙，先在这里谢过了

,还有就是想问一下  fragmentManager = getSupportFragmentManager();和  fragmentManager = getFragmentManager();区别是什么。这俩都是用来干什么的

public class FenleiFragmentTest extends Fragment {
    private FragmentManager fragmentManager;
    private FragmentTransaction transaction;
    private RadioGroup radioGroup;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fenlei_fragment_test, null);
        fragmentManager = getFragmentManager();
        radioGroup = (RadioGroup)view.findViewById(R.id.fenlei_test_radioGroup);
        //设置默认打开的页面
        ((RadioButton)radioGroup.findViewById(R.id.fenlei_test_radioGroup_btn1)).setChecked(true);
        transaction = fragmentManager.beginTransaction();
        Fragment fragment = new FenleiGridFragment();
        transaction.replace(R.id.fenlei_test_frame_layout, fragment);
        transaction.commit();

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case R.id.fenlei_test_radioGroup_btn1:
                        transaction = fragmentManager.beginTransaction();
                        Fragment fenleiFragment = new FenleiGridFragment();
                        transaction.replace(R.id.fenlei_test_frame_layout, fenleiFragment);
                        transaction.commit();
                        break;
                    case R.id.fenlei_test_radioGroup_btn2:
                        transaction=fragmentManager.beginTransaction();
                        Fragment fenleiFragement1=new FenleiGridFragmenta();
                        transaction.replace(R.id.fenlei_test_frame_layout,fenleiFragement1);
                        transaction.commit();
                        break;
                }
            }
        });
        return view;
    }
}

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