得到的最新片段backstack [英] get the latest fragment in backstack

问题描述

我怎样才能获得最新的片段，比如在backstack加（如果我不知道该片段标记和ID）？

  FragmentManager fragManager = activity.getSupportFragmentManager（）;
FragmentTransaction fragTransacion = fragMgr.beginTransaction（）;

/ ****添加后，更换片段
  （一些片段被添加到backstack，有些则不是）*** /

//这里，我怎样才能从backstack最新添加的片段？
 

解决方案

您可以使用FragmentManager.BackStackEntry的GetName方法是在API级别14引入，此方法将返回一个字符串，它可以检查存储在addTobackStack字符串片段交易过程中（STR）的方法。

  FragmentManager.BackStackEntry backEntry=getFragmentManager().getBackStackEntryAt(getActivity().getFragmentManager().getBackStackEntryCount()-1);
    字符串str = backEntry.getName（）;
    片段片段= getFragmentManager（）findFragmentByTag（STR）。
 

您需要确保你所添加的片段backstack这样

  fragmentTransaction.addToBackStack（STR）;
 

How can I get the latest fragment instance added in backstack (if I do not know the fragment tag & id)?

FragmentManager fragManager = activity.getSupportFragmentManager();
FragmentTransaction fragTransacion = fragMgr.beginTransaction();

/****After add , replace fragments 
  (some of the fragments are add to backstack , some are not)***/

//HERE, How can I get the latest added fragment from backstack ??

解决方案

You can use getName method of FragmentManager.BackStackEntry which is introduced in API level 14 and this method will return a string which you can check as the string stored in addTobackStack(str) method during fragment transaction.

   FragmentManager.BackStackEntry backEntry=getFragmentManager().getBackStackEntryAt(getActivity().getFragmentManager().getBackStackEntryCount()-1);
    String str=backEntry.getName();
    Fragment fragment=getFragmentManager().findFragmentByTag(str);

You need to ensure that you have added the fragments in backstack like this

   fragmentTransaction.addToBackStack(str);

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