android – popBackStack导致一次又一次调用片段的oncreateView

public void addFragment(Fragment fragmenttoadd,String fragmentTag) {
        FragmentManager supportFragmentManager = getSupportFragmentManager();
        Fragment activeFragment = getActiveFragment();
        Fragmenttransaction fragmenttransaction = supportFragmentManager
                .begintransaction();
        if (null != activeFragment) {
            fragmenttransaction.hide(activeFragment);
        }
        fragmenttransaction.replace(R.id.layout_child_activity,fragmenttoadd,fragmentTag);

       if (supportFragmentManager.getBACkStackEntryCount() > 1) {
            supportFragmentManager.popBACkStack();
        }
        fragmenttransaction.addToBACkStack(fragmentTag);
        fragmenttransaction.commit();
    }

if (supportFragmentManager.getBACkStackEntryCount() > 1) {
    supportFragmentManager.popBACkStack();
}

正如文档所说,正如行为是正常的,来自后台交易. BACkstack,从不保存Fragments,它只是保存事务

http://developer.android.com/intl/es/guide/components/fragments.html

我做了什么,我不确定它是否是最好的方式,但是
当我想清除我做的所有交易

1)在您的活动中检查后堆栈中是否有任何交易,
并在你的片段中添加一个标志,在你的情况下是A.

int BACkStackCount = getSupportFragmentManager().getBACkStackEntryCount();

       if(BACkStackCount > 0) {
           transactions.MUST_DETACH_FROM_BACKSTACK = true;
           getSupportFragmentManager().popBACkStackImmediate(null,FragmentManager.POP_BACK_STACK_INCLUSIVE);
       }

2)在你的片段A里面,获取标志并删除fragent onCreateView并像这样返回null

public class transactions extends android.support.v4.app.Fragment{

public static Boolean MUST_DETACH_FROM_BACKSTACK = false;

public transactions() {
    // required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE) {
    Log.i("FRAGMENT","onCreateView "+MUST_DETACH_FROM_BACKSTACK);
    // Inflate the layout for this fragment
    if (MUST_DETACH_FROM_BACKSTACK) {
        MUST_DETACH_FROM_BACKSTACK = false;
        getActivity().getSupportFragmentManager().begintransaction().remove(this).commit();
        return null;
    }
    return inflater.inflate(R.layout.fragment_transactions,container,falsE);
}

@Override
public void onViewCreated(View view,Bundle savedInstanceStatE) {
    super.onViewCreated(view,savedInstanceStatE);


    Log.i("FRAGMENT","onViewCreated");
    if(view != null){

        Log.i("FRAGMENT","ThreadStarted");
        startThread(view);
    }
}

但要小心我得到onResume()之后调用

OnCreateView()

即使使用getActivity().getSupportFragmentManager().begintransaction().remove(this).commit();

因此,如果你有任何conde onResume方法,你应该适当地处理它