我有一个片段，我放置了一个包含三个片段的视图寻呼机，当我在这个代码的帮助下从这三个片段中的任何片段打开另一个片段时：
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.content_frame, fragment);
fragment.setRetainInstance(true);
transaction.addToBackStack(null);
transaction.commit();
它打开就像一个魅力，但当我按下后退按钮时，其中一个视图寻呼机的视图已经消失。我尝试在stackoverflow中提到不同的方法，但没有任何帮助。
我内部的第一个片段放置了我的viewPager代码：
public class Fragment1 extends Fragment implements
OnClickListener {
ICallback callback;
private LinearLayout headerContainer;
private ImageView headerLogo;
private TextView headerName;
private Button menuBarButton;
MyAdapter adapter;
ViewPager pager;
ActionBar actionBar;
private Button progOverview, progStr, bonusPoint;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof ICallback) {
this.callback = (ICallback) activity;
}
actionBar = activity.getActionBar();
actionBar.show();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = setUpView(inflater, container);
return rootView;
}
private View setUpView(LayoutInflater inflater, ViewGroup container) {
View rootView = inflater.inflate(
R.layout.fragment_about_champions_club, container, false);
// set content of layout
headerContainer = (LinearLayout) rootView
.findViewById(R.id.second_top_header);
headerContainer.setBackgroundColor(getResources().getColor(
R.color.prog_str_blue));
headerLogo = (ImageView) rootView.findViewById(R.id.header_logo);
headerLogo.setBackgroundResource(R.drawable.about_champions_ticon);
headerName = (TextView) rootView.findViewById(R.id.header_name);
headerName.setText(R.string.about_champ_title);
adapter = new MyAdapter(getFragmentManager());
pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
return rootView;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
// Restore last state for checked position.
}
}
}
}
，其中一个显示内部viewpager的片段视图是：
public class ProgramOverViewFragment extends Fragment {
ICallback callback;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof ICallback) {
this.callback = (ICallback) activity;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.fragment_program_overview, container, false);
TextView termsAndCond = (TextView) rootView
.findViewById(R.id.terms_and_condition_button);
termsAndCond.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.content_frame, fragment);
fragment.setRetainInstance(true);
transaction.addToBackStack(null);
transaction.commit();
}
});
return rootView;
}
}
和我的适配器的代码：
public class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public android.support.v4.app.Fragment getItem(int index) {
switch (index) {
case 0:
return new ProgramOverViewFragment();
case 1:
return new ProgramStructureFragment();
case 2:
return new BonusPointFragment();
}
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
}