android - 如何在 android 中从 BackStack 加载 fragment

Question

我在一个 fragment 中有 4 个按钮。当我单击一个按钮“A”时，将加载一个 fragment 。当单击按钮“B”时，将加载另一个 fragment ，依此类推。我的问题是当我再次点击按钮时，一个新的 fragment 正在加载。我想从 backStack 加载前一个 fragment 。

    if(rootView.findViewById(R.id.talk_main_container)!=null){
            FragmentTransaction transaction = getFragmentManager().beginTransaction();
            Bundle bundle=new Bundle();
            bundle.putString("cityid", cityId);
            if(position == 1){
                MainForumsFragment mTalkNewFragment = new MainForumsFragment(); 
                mTalkNewFragment.setArguments(bundle);
                transaction.replace(R.id.talk_main_container, mTalkNewFragment);  
            }
            if(position == 2){
                TalkNewFragment mTalkNewFragment = new TalkNewFragment();  
                mTalkNewFragment.setArguments(bundle);
                transaction.replace(R.id.talk_main_container, mTalkNewFragment);  
            }
            if(position == 3){
                TalkNewFragment mTalkNewFragment = new TalkNewFragment();  
                mTalkNewFragment.setArguments(bundle);
                transaction.replace(R.id.talk_main_container, mTalkNewFragment);  
            }
            transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
            transaction.addToBackStack(null);
            transaction.commit();  
        }

那么我该如何实现呢？

Answer 1

不要向堆栈添加任何 fragment

移除 transaction.addToBackStack(null);