删除后片段仍然存在？

1将两个片段添加到FragmentManager

FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft1 = fm.beginTransaction();
ft1.add(containerId, fragment1, "fragment1");
ft1.addToBackStack(null);
ft1.commitAllowingStateLoss();

FragmentTransaction ft2 = fm.beginTransaction();
ft2.add(containerId, fragment2, "fragment2");
ft2.addToBackStack(null);
ft2.commitAllowingStateLoss();

2更改移动设置开发人员选项 - >不要保持活动 - >开启

3重新创建活动后删除所有片段

FragmentTransaction ft3 = fm.beginTransaction();
for(Fragment f : fm.getFragments())  ft3.remove(f); 
ft3.commitAllowingStateLoss();

我的问题是为什么删除后fm.findFragmentByTag("fragment1")不为null？

minSdkVersion 17 targetSdkVersion 22 compileSdkVersion 22

尝试使用此代码删除片段

FragmentManager manager = getActivity().getSupportFragmentManager();
FragmentTransaction trans = manager.beginTransaction();
trans.remove(myFrag);
trans.commit();
manager.popBackStack();

我想你还没有添加这种方法

manager.popBackStack();

要么

getSupportFragmentManager().popBackStack()