Question

我有Activity 02 tabLayout

我在第一个标签中添加了First Fragment，因为我在第二个标签中添加了Second Fragment，所以每件事情都很好

我的Second Fragment有效但当我旋转设备时它会崩溃，这是我的代码和logCat ..

我试图以不同的方式将<{em>} FragmentTwo附加到我的MainActivity。任何人都可以告诉我什么是wroNg＆amp;＆amp;我怎么能正确地做到这一点？

先谢谢。

主要活动：

public class MainActivity extends AppCompatActivity { private DrawerLayout mDrawerLayout; private TabLayout tabLayout; private ViewPager viewPager; private int[] tabIcons = { R.drawable.ic_tab_note, R.drawable.ic_tab_calendar }; private static final int TIME_DELAY = 2000; private static long back_pressed; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //////// TOOLBAR Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); ActionBar actionBar = getSupportActionBar(); actionBar.setHomeAsUpIndicator(R.drawable.ic_menu); actionBar.setDisplayHomeAsUpEnabled(true); ///////// DRAWER mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view); navigationView.setNavigationItemSelectedListener (new NavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(MenuItem menuItem) { menuItem.setChecked(true); mDrawerLayout.closeDrawers(); Toast.makeText(MainActivity.this, menuItem.getTitle(), Toast.LENGTH_LONG).show(); return true; } }); viewPager = (ViewPager) findViewById(R.id.viewpager); setupViewPager(viewPager); tabLayout = (TabLayout) findViewById(R.id.tablayout); tabLayout.setupWithViewPager(viewPager); } private void setupViewPager(ViewPager viewPager) { ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); adapter.addFragment(new FragmentOne(), "ONE"); adapter.addFragment(new FragmentTwo(), "TWO"); viewPager.setAdapter(adapter); } class ViewPagerAdapter extends FragmentPagerAdapter { private final List<Fragment> mFragmentList = new ArrayList<>(); private final List<String> mFragmentTitleList = new ArrayList<>(); public ViewPagerAdapter(FragmentManager manager) { super(manager); } @Override public Fragment getItem(int position) { return mFragmentList.get(position); } @Override public int getCount() { return mFragmentList.size(); } public void addFragment(Fragment fragment, String title) { mFragmentList.add(fragment); mFragmentTitleList.add(title); } @Override public CharSequence getPageTitle(int position) { // return mFragmentTitleList.get(position); return null; } } }

FragmentTwo：

import ir.mirrajabi.persiancalendar.PersianCalendarView; import ir.mirrajabi.persiancalendar.core.PersianCalendarHandler; import ir.mirrajabi.persiancalendar.core.interfaces.OnDayClickedListener; import ir.mirrajabi.persiancalendar.core.interfaces.OnMonthChangedListener; import ir.mirrajabi.persiancalendar.core.models.CalendarEvent; import ir.mirrajabi.persiancalendar.core.models.PersianDate; public class FragmentTwo extends Fragment { private View view; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { view = inflater.inflate(R.layout.fragment_two_layout, container, false); final PersianCalendarView persianCalendarView = (PersianCalendarView) view.findViewById(R.id.persian_calendar); final PersianCalendarHandler calendar = persianCalendarView.getCalendar(); final PersianDate today = calendar.getToday(); calendar.addLocalEvent(new CalendarEvent( today, "Custom event", false )); calendar.addLocalEvent(new CalendarEvent( today.clone().rollDay(2, true), "Custom event 2", true )); calendar.setOnMonthChangedListener(new OnMonthChangedListener() { @Override public void onChanged(PersianDate date) { Toast.makeText(getActivity(), calendar.getMonthName(date), Toast.LENGTH_SHORT).show(); } }); persianCalendarView.setOnDayClickedListener(new OnDayClickedListener() { @Override public void onClick(PersianDate date) { for (CalendarEvent e : calendar.getAllEventsForDay(date)) Toast.makeText(getActivity(), e.getTitle(), Toast.LENGTH_LONG).show(); calendar.addLocalEvent(new CalendarEvent( today.clone().rollDay(2, false), "Some event that will be added in runtime", false )); persianCalendarView.update(); } }); calendar.setHighlightOfficialEvents(false); TextView txtDayMonth = (TextView) view.findViewById(R.id.txt_day_month); TextView txtYear = (TextView) view.findViewById(R.id.txt_year); String dayAndMonth = calendar.getWeekDayName(today) + calendar.formatNumber(today.getDayOfMonth()) + calendar.getMonthName(today); txtDayMonth.setText(dayAndMonth); txtYear.setText(calendar.formatNumber(today.getYear())); calendar.setColorBackground(getResources().getColor(android.R.color.holo_blue_dark)); persianCalendarView.update(); return view; } }

这是我的activity_main.xml：

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <RelativeLayout android:id="@+id/base2" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" android:theme="@style/ThemeOverlay.AppCompat.Dark"/> <android.support.design.widget.TabLayout android:id="@+id/tablayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="?attr/colorPrimary" app:tabGravity="fill" android:theme="@style/ThemeOverlay.AppCompat.Dark"/> <RelativeLayout android:id="@+id/relativee" android:layout_width="wrap_content" android:layout_height="wrap_content"> <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="match_parent" layout_weight="1"/> </RelativeLayout> </LinearLayout> </RelativeLayout> <android.support.design.widget.NavigationView android:id="@+id/navigation_view" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="start" app:headerLayout="@layout/drawer_header" app:menu="@menu/drawer"/> </android.support.v4.widget.DrawerLayout>

这里是fragment_two_layout.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/colorPrimaryDark" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="24dp"> <ir.mirrajabi.persiancalendar.PersianCalendarView android:id="@+id/persian_calendar" android:layout_width="match_parent" android:layout_height="290sp" app:pcv_colorBackground="#292929" app:pcv_colorDayName="#bab6b6" app:pcv_colorHoliday="#ffd506" app:pcv_colorHolidaySelected="#f1f2f3" app:pcv_colorNormalDaySelected="#d9d9d9" app:pcv_colorNormalDay="#f3f4f5" app:pcv_eventUnderlineColor="#02f0f0" app:pcv_fontSize="20sp" app:pcv_headersFontSize="14sp"/> </android.support.v7.widget.CardView> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_marginBottom="8dp"> <TextView android:id="@+id/txt_day_month" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/colorAccent" android:layout_gravity="center_horizontal" android:textSize="30sp"/> <TextView android:id="@+id/txt_year" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:textColor="@color/colorAccent" android:textSize="20sp"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal"> <Button android:id="@+id/change_to_ad" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Change to Gregorian Calendar" android:textSize="14dp"/> </LinearLayout> </LinearLayout>

logcat的：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.drgnme.listhamrah/com.drgnme.listhamrah.MainActivity}: java.lang.IllegalStateException: Fragment has not been attached yet. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2434) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4095) at android.app.ActivityThread.access$1000(ActivityThread.java:153) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1353) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5451) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.IllegalStateException: Fragment has not been attached yet. at android.support.v4.app.Fragment.instantiateChildFragmentManager(Fragment.java:2195) at android.support.v4.app.Fragment.getChildFragmentManager(Fragment.java:745) at ir.mirrajabi.persiancalendar.core.fragments.CalendarFragment.createViewPagers(CalendarFragment.java:55) at ir.mirrajabi.persiancalendar.core.fragments.CalendarFragment.access$000(CalendarFragment.java:27) at ir.mirrajabi.persiancalendar.core.fragments.CalendarFragment$1.update(CalendarFragment.java:46) at ir.mirrajabi.persiancalendar.PersianCalendarView.update(PersianCalendarView.java:116) at com.drgnme.listhamrah.FragmentTwo.onCreateView(FragmentTwo.java:87) at android.support.v4.app.Fragment.performCreateView(Fragment.java:2239) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1332) at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641) at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2959) at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201) at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:550) at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:177) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1238) at android.app.Activity.performStart(Activity.java:6340) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4095) at android.app.ActivityThread.access$1000(ActivityThread.java:153) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1353) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5451) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

将以下所有代码移至onActivityCreated()：

final PersianCalendarView persianCalendarView = (PersianCalendarView) view.findViewById(R.id.persian_calendar);
        final PersianCalendarHandler calendar = persianCalendarView.getCalendar();
        final PersianDate today = calendar.getToday();
        calendar.addLocalEvent(new CalendarEvent(
                today, "Custom event", false
        ));
        calendar.addLocalEvent(new CalendarEvent(
                today.clone().rollDay(2, true), "Custom event 2", true
        ));
        calendar.setOnMonthChangedListener(new OnMonthChangedListener() {
            @Override
            public void onChanged(PersianDate date) {
                Toast.makeText(getActivity(), calendar.getMonthName(date), Toast.LENGTH_SHORT).show();
            }
        });
        persianCalendarView.setOnDayClickedListener(new OnDayClickedListener() {
            @Override
            public void onClick(PersianDate date) {
                for (CalendarEvent e : calendar.getAllEventsForDay(date))
                    Toast.makeText(getActivity(), e.getTitle(), Toast.LENGTH_LONG).show();


                calendar.addLocalEvent(new CalendarEvent(
                        today.clone().rollDay(2, false), "Some event that will be added in runtime", false
                ));
                persianCalendarView.update();
            }
        });

        calendar.setHighlightOfficialEvents(false);
        TextView txtDayMonth = (TextView) view.findViewById(R.id.txt_day_month);
        TextView txtYear = (TextView) view.findViewById(R.id.txt_year);

        String dayAndMonth = calendar.getWeekDayName(today) + calendar.formatNumber(today.getDayOfMonth())
                + calendar.getMonthName(today);
        txtDayMonth.setText(dayAndMonth);
        txtYear.setText(calendar.formatNumber(today.getYear()));

        calendar.setColorBackground(getResources().getColor(android.R.color.holo_blue_dark));
        persianCalendarView.update();

除了在onCreateView()

中扩充布局之外，最好不要做任何其他工作

Answer 2

问题不在您的应用中，问题出现在PersianCalendar Lib中，

如果你在PersianCalendarView.java中检查它们的实现，你在Fragment类的布局中膨胀PersianCalendarView，1。它们正在膨胀一个布局，并且他们试图在该FragmentManager中的那个布局中添加一个Fragment并且它正在工作精细。 2.但不仅仅是那个Fragment中他们试图使用getChildFragmentManager()添加ViewPager问题只是她的问题。

你可以问为什么？已经有一个FragmentManager添加了这个Fragment，它的工作正常，但现在它正在崩溃，为此，你可以检查this S0 Answer中的2 FragmnetManger之间的区别

对于这个问题，你可以做三件事， 1.您可以为他们创建票证并等待结果你可以解决这个问题 3.而不是添加布局，只需在Fragment中创建一个ViewGroup，当调用onActivtyCreated时，您可以添加该布局运行时。

<强> EDITED

我尝试了那个样本，并且我尝试将其添加到Fragment中，我遇到的问题是，实际上即使我们的Fragment附加到Activity上也没有附加CalendarView片段，所以我在解决方案3中提到我们可以添加它在onActivtyCreated中出错了。

然后我们如何暂时解决？

我通过添加onStart中的视图解决了（我知道这是错误的地方，这将在Fragment的生命周期中多次调用），但我们可以添加一些逻辑，我们只能添加此日历视图一旦让它现在工作，直到他们的lib中的开发工具。

我的样本：

我的片段布局：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             tools:context="ir.mirrajabi.pc.sample.BlankFragment">

    <LinearLayout
        android:id="@+id/calendar_container"
        android:layout_width="match_parent"
        android:layout_height="290dp"
        android:orientation="vertical"/>

    <TextView
        android:id="@+id/txt_day_month"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textColor="#f0f2f3"
        android:textSize="30sp"/>

    <TextView
        android:id="@+id/txt_year"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textColor="#c6d9e2"
        android:textSize="20sp"/>

</FrameLayout>

片段代码

public class BlankFragment extends Fragment {

    private LinearLayout mLinearLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_blank, container, false);

        mLinearLayout= (LinearLayout) view.findViewById(R.id.calendar_container);

        return view;
    }

    @Override
    public void onStart() {
        super.onStart();

        final PersianCalendarView persianCalendarView = new PersianCalendarView(getContext());

        // All your remaining PersianCalendarView implementation code here
        mLinearLayout.addView(persianCalendarView);
    }
}

注意：

如果你采取上述方法，请添加一些逻辑并确保它在片段中的onStart调用时不添加多个时间。

Answer 3

只需在persianCalendarView.update()的{{1}}内移动FragmentTwo行，然后将其从onAttach移除：

onCreate()

同时从@Override public void onAttachFragment(Fragment childFragment) { super.onAttachFragment(childFragment); persianCalendarView.update(); }的{{1}}内删除update()。我在测试时添加了该行，忘记将其从示例应用中删除。 您不必更新persianCalendarView ，除非您需要更改主题或在运行时添加事件。

旋转崩溃时出现此错误：片段尚未附加

3 个答案: