Android 如何替换ViewPager中的片段

我在这个问题上纠结了几天，快把我逼疯了。看起来我正在尝试做的是一个非常常见的用例，但我一辈子都想不出来

因此，问题是：我想替换ViewPager中的片段，并保持Backback的正常操作

我的ViewPager包含两个显示ListView的片段。当处于ViewPager的第一个位置时，我希望能够深入查看ListView，并能够使用后退按钮后退，如下所示：

艺术家->专辑->歌曲

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艺术家您可以通过覆盖活动中的

onBackPressed

方法来管理“backbackback”，并跟踪用户当前处于哪个级别，并根据需要显示或返回活动

@Override
public void onBackPressed(){
    if (mLevel > 1) {
        // in your case probably change the adapter item for the page
        mViewPagerAdapter.notifyDataSetChanged()
    }
    ...
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    final Artist artist = (Artist) adapter.getItem(position);
    itemSelectedListener.onItemSelected(artist);
}

public class ListPagerAdapter extends FragmentPagerAdapter {
    SearchView searchView;
    BrowserFragment browserFragment;
    PlaylistFragment playlistFragment;

    public ListPagerAdapter(SearchView searchView, FragmentManager fm) {
        super(fm);
        this.searchView = searchView;
    }

    public boolean browserFragmentCanGoBack() {
        return browserFragment.canGoBack();
    }

    public void browserFragmentBack() {
        browserFragment.goBack();
    }

    @Override
    public Fragment getItem(int position) {
        if (position == 1) {
            if (playlistFragment == null) {
                playlistFragment = new PlaylistFragment(searchView);
            }
            return playlistFragment;

        } else {
            if (browserFragment == null) {
                browserFragment = new BrowserFragment(searchView);
            }
            return browserFragment;
        }
    }

    @Override
    public int getCount() {
        return 2;
    }
}

@Override
public void onBackPressed() {
    if (viewPager.getCurrentItem() == 0) {
        if (pagerAdapter.browserFragmentCanGoBack()) {
            pagerAdapter.browserFragmentBack();
        } else {
            super.onBackPressed();
        }
    } else {
        viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);
    }
}

@Override
public void onBackPressed(){
    if (mLevel > 1) {
        // in your case probably change the adapter item for the page
        mViewPagerAdapter.notifyDataSetChanged()
    }
    ...
}