如何再次在FrameLayout中加载一个Fragment？

Question

可以说我有类别A和类别B。我根据类别将数据加载到RecyclerView中。 然后是一个过滤器，它实际上过滤内容。 这是打开/关闭过滤器时的操作：

@Override
        public void onShowSheet() {
            Fragment f = getActivity().getSupportFragmentManager().findFragmentById(R.id.filterContent);
            if (!(f instanceof FilterFragment)) {
                FilterFragment filterFragment = FilterFragment.newInstance();
                FragmentManager fm = getActivity().getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fm.beginTransaction();
                fragmentTransaction.replace(R.id.filterContent, filterFragment, "FilterFragment");
                fragmentTransaction.commit();
            }
        }

        @Override
        public void onHideSheet() {
            Fragment f = getActivity().getSupportFragmentManager().findFragmentById(R.id.filterContent);
            getActivity().getSupportFragmentManager().beginTransaction().
                    remove(getActivity().getSupportFragmentManager().findFragmentById(R.id.filterContent)).commit();
            FragmentManager manager = getActivity().getSupportFragmentManager();
            FragmentTransaction trans = manager.beginTransaction();
            trans.remove(f);
            trans.commit();
        }
    });

重新打开过滤器后，它将重新加载过滤器片段及其数据。

当我更改类别并打开过滤器时，它显示为空白。

我如何加载或杀死该片段，以使其不显示空白？

---

更新资料

更改类别并且过滤器为空白后，按返回键，然后返回到预览类别，并显示过滤器，但是如果尝试应用过滤器，应用程序将崩溃。

更改类别时，我会重新加载数据片段：

public static void inflateGridFragment() {
    GridFragment fragment = new GridFragment();
    FragmentManager fm = context.getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fm.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right,
            R.anim.slide_out_left, R.anim.slide_out_left);
    fragmentTransaction.add(R.id.mdContent, fragment, Strings.TAG_GRID_FRAMGMENT);
    fragmentTransaction.addToBackStack(Strings.TAG_GRID_FRAMGMENT);
    fragmentTransaction.commit();
}

Answer 1

问题在于，当从类别A更改为类别B时，我正在重新加载承载Filters片段的父片段。 因此，在更改类别时，我检查了包含RecyclerView片段是否在后堆栈中，然后将popBackStack to that fragment, and update the data from如下to that fragment, and update the data from RecyclerView` to that fragment, and update the data from ：

boolean foundGridFragment = false;
        String fragmentBackstackTag = "";
        FragmentManager fm = context.getSupportFragmentManager();
        for(int entry = 0; entry < fm.getBackStackEntryCount(); entry++){
            fragmentBackstackTag = fm.getBackStackEntryAt(entry).getName();
            Log.i(TAG, "Found fragment: " + fragmentBackstackTag);

            // check if null, because sometimes fragmentBackstacktag may null
            if (fragmentBackstackTag != null) {
                if (fragmentBackstackTag.equals(Strings.TAG_GRID_FRAMGMENT)) {
                    foundGridFragment = true;
                    fm.popBackStack(Strings.TAG_GRID_FRAMGMENT, 0);
                }
            }
        }
        if (!foundGridFragment) {
            inflateGridFragment();
        }

这也优化了内存使用。