开启设备后,当运行 DialogFragment报错
After turning the device, when running DialogFragment error
有一个包含 FAB 和 ViewPager 的片段:
public class PageFragment extends Fragment {
public static final String ARG_PAGE = "ARG_PAGE";
private static final String DATE_PICKER_FRAGMENT = "dpf";
private FloatingActionButton FABAddDay;
BottomAppBar mBottomAppBar;
FragmentManager mFragmentManager;
SampleFragmentPagerAdapter mSampleFragmentPagerAdapter;
Fragment mDaysListFragment;
DialogFragment mDatePickerFragment;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_layout, container, false);
ViewPager viewPager = view.findViewById(R.id.viewpager);
mSampleFragmentPagerAdapter = new SampleFragmentPagerAdapter(getFragmentManager(), getActivity());
viewPager.setAdapter(mSampleFragmentPagerAdapter);
mDaysListFragment = DaysListFragment.newInstance();
mDatePickerFragment = DatePickerFragment.newInstance();
mFragmentManager = getFragmentManager();
TabLayout tabLayout = view.findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);
FABAddDay = view.findViewById(R.id.fab);
mBottomAppBar = view.findViewById(R.id.bottom_app_bar);
mBottomAppBar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.settings: {
Intent intent = new Intent(getActivity(), SettingsActivity.class);
startActivity(intent);
return true;
}
default:
return true;
}
}
});
FABAddDay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mDatePickerFragment.setTargetFragment(mDaysListFragment, DaysListFragment.REQUEST_DATE);
mDatePickerFragment.show(mFragmentManager, DaysListFragment.DIALOG_DATE);
}
});
return view;
}
public class SampleFragmentPagerAdapter extends FragmentPagerAdapter {
final int PAGE_COUNT = 2;
private String tabTitles[] = new String[]{"List", "Calendar"};
public SampleFragmentPagerAdapter(FragmentManager fm, Context context) {
super(fm);
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public androidx.fragment.app.Fragment getItem(int position) {
switch (position) {
case 0:
return mDaysListFragment;
case 1:
return new CalendarFragment();
default:
return null;
}
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}
}
ViewPager 中的一个片段从 DatePickerFragment(对话框)获取结果并在 onActivityResult 中处理它,一切正常,但是如果您旋转设备然后尝试 运行 DatePickerFragment,一个发生错误:
Process: com.example.taskplanner, PID: 7851
java.lang.IllegalStateException: Fragment DatePickerFragment{4d9dc48 (a5fb8e8f-12c0-4f7b-ad26-220f6322d846) dialogDate} declared target fragment DaysListFragment{990eae1 (70133c60-029f-4b23-ad5a-954b0abb630f)} that does not belong to this FragmentManager!
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:805)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
我不明白为什么会这样,我该怎么办?
不太明白为什么会报这个错,好像是重新创建target fragment的问题。我试图保存这个片段,一切正常。
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
mFragmentManager.putFragment(outState, "dlf", mDaysListFragment);
super.onSaveInstanceState(outState);
}
onCreateView:
if (savedInstanceState!=null){
mDaysListFragment= mFragmentManager.getFragment(savedInstanceState, "dlf");
}
else
mDaysListFragment = DaysListFragment.newInstance();
有一个包含 FAB 和 ViewPager 的片段:
public class PageFragment extends Fragment {
public static final String ARG_PAGE = "ARG_PAGE";
private static final String DATE_PICKER_FRAGMENT = "dpf";
private FloatingActionButton FABAddDay;
BottomAppBar mBottomAppBar;
FragmentManager mFragmentManager;
SampleFragmentPagerAdapter mSampleFragmentPagerAdapter;
Fragment mDaysListFragment;
DialogFragment mDatePickerFragment;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_layout, container, false);
ViewPager viewPager = view.findViewById(R.id.viewpager);
mSampleFragmentPagerAdapter = new SampleFragmentPagerAdapter(getFragmentManager(), getActivity());
viewPager.setAdapter(mSampleFragmentPagerAdapter);
mDaysListFragment = DaysListFragment.newInstance();
mDatePickerFragment = DatePickerFragment.newInstance();
mFragmentManager = getFragmentManager();
TabLayout tabLayout = view.findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);
FABAddDay = view.findViewById(R.id.fab);
mBottomAppBar = view.findViewById(R.id.bottom_app_bar);
mBottomAppBar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.settings: {
Intent intent = new Intent(getActivity(), SettingsActivity.class);
startActivity(intent);
return true;
}
default:
return true;
}
}
});
FABAddDay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mDatePickerFragment.setTargetFragment(mDaysListFragment, DaysListFragment.REQUEST_DATE);
mDatePickerFragment.show(mFragmentManager, DaysListFragment.DIALOG_DATE);
}
});
return view;
}
public class SampleFragmentPagerAdapter extends FragmentPagerAdapter {
final int PAGE_COUNT = 2;
private String tabTitles[] = new String[]{"List", "Calendar"};
public SampleFragmentPagerAdapter(FragmentManager fm, Context context) {
super(fm);
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public androidx.fragment.app.Fragment getItem(int position) {
switch (position) {
case 0:
return mDaysListFragment;
case 1:
return new CalendarFragment();
default:
return null;
}
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}
}
ViewPager 中的一个片段从 DatePickerFragment(对话框)获取结果并在 onActivityResult 中处理它,一切正常,但是如果您旋转设备然后尝试 运行 DatePickerFragment,一个发生错误:
Process: com.example.taskplanner, PID: 7851
java.lang.IllegalStateException: Fragment DatePickerFragment{4d9dc48 (a5fb8e8f-12c0-4f7b-ad26-220f6322d846) dialogDate} declared target fragment DaysListFragment{990eae1 (70133c60-029f-4b23-ad5a-954b0abb630f)} that does not belong to this FragmentManager!
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:805)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
我不明白为什么会这样,我该怎么办?
不太明白为什么会报这个错,好像是重新创建target fragment的问题。我试图保存这个片段,一切正常。
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
mFragmentManager.putFragment(outState, "dlf", mDaysListFragment);
super.onSaveInstanceState(outState);
}
onCreateView:
if (savedInstanceState!=null){
mDaysListFragment= mFragmentManager.getFragment(savedInstanceState, "dlf");
}
else
mDaysListFragment = DaysListFragment.newInstance();