重新加载Fragment时，Fragment onCreate方法被调用多次

Question

重新加载Fragment时，Fragment onCreate方法被调用多次

androidandroid-listviewandroid-fragmentsandroid-fragmentactivityandroid-listfragment

5

以下是我的代码：

public class MyListFragmentActivity extends FragmentActivity{

@Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    System.out.println("DEBUG : MLFA onCreate");
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction().replace(fragmentID, new MyListFragment())
            .replace(detailFragmentID, new MyDetailFragment()).commit();
        }
    }



     @Override
    protected void onRestart() {
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            Fragment prevFrag = getSupportFragmentManager().findFragmentById(detailFragmentID);
    if (prevFrag != null) {
        fragmentTransaction.remove(prevFrag);
        getSupportFragmentManager().beginTransaction().replace(detailFragmentID, new MyDetailFragment()).commitAllowingStateLoss();
    } else {
        getSupportFragmentManager().beginTransaction().replace(detailFragmentID, new MyDetailFragment()).commitAllowingStateLoss();
    }
}

MyListFragment

public class MyListFragment extends Fragment{

//When we click on each item in list view call detail fragment to relad its layout
OnItemClickListener onItemClickListener = new OnItemClickListener() {

/** Getting the fragmenttransaction object, which can be used to add, remove or replace a fragment */
        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
        /** Getting the existing detailed fragment object, if it already exists.
        *  The fragment object is retrieved by its tag name
        * */
        Fragment prevFrag = getFragmentManager().findFragmentById(detailFragmentID);

        /** Remove the existing detailed fragment object if it exists */
        if (prevFrag != null) {
            fragmentTransaction.remove(prevFrag);
           MyDetailFragment mydetailFragment = new MyDetailFragment();
            fragmentTransaction.replace(detailFragmentID, mydetailFragment);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.show(getFragmentManager().findFragmentById(detailFragmentID));
            fragmentTransaction.commit();
        }
}

MyDetailFragment

public class MyDetailFragment extends Fragment{

onCreate() // on create being called multiple times ? why ?????????????

onCreateView()

}

当我单击列表项时，MyDetailFragment的onCreate（）仅被调用一次，但是当我将设备倾斜到纵向或横向时，MyDetailFragment的onCreate（）会被多次调用？

为什么会这样？我在这里做错了什么，如何解决？

- Goofy

1个回答

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- An SO User · Answer 1

每次更改方向，都相当于重新启动应用程序。您需要适当处理更改，例如释放资源、重新获取资源、停止任何正在进行的工作并恢复它们等等。

您没有做错任何事情。