嵌套片段getchildfragmentmanager导致崩溃 [英] Nested fragments getchildfragmentmanager causing crash
问题描述
我有一个包含片段的viewPager，每个片段都有viewpager以显示图像和横幅
I have viewPager which contains fragments each of these fragment has viewpager to display Images and banners
现在给每个片段图像适配器了，我通过getChildFragmentManager（）如下所示
now to each fragment Image adapter I am passing getChildFragmentManager() as below
CarouselAdapter carouselAdapter = new CarouselAdapter(getChildFragmentManager());
但是上面的代码在更改显示以下消息的viewpager选项卡时会导致崩溃
But above code is causing crash while changing viewpager tabs showing following message
java.lang.IllegalArgumentException: No view found for id 0x7f1000ef
的视图
但是，如果我通过getFragmentManager（），它不会崩溃，但是适配器会在一段时间内变为空白，然后提示如何处理嵌套的片段。
But if I pass getFragmentManager() it is not crashing but adapter goes blank for some time any Idea how to handle nested fragments.
我在两个Viewpagers上都使用FragmentPagerAdapter，但仍然无法正常工作
I am using FragmentPagerAdapter for both viewpagers but still its not working
以下是崩溃日志
java.lang.IllegalArgumentException: No view found for id 0x7f1000ef (com.packagename:id/viewPagerBanners) for fragment MainBannerFragmentNew{308cb84 #0 id=0x7f1000ef android:switcher:2131755247:0}
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1292)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1523)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1585)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2832)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:2199)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1323)
at android.support.v4.app.FragmentManagerImpl.moveFragmentsToInvisible(FragmentManager.java:2323)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2136)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2092)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1969)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:620)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1268)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:273)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:603)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
以下是轮播适配器代码
public class CarouselAdapter extends FragmentPagerAdapter {
private List<CarouselItem> carouselItemsList;
public CarouselAdapter(FragmentManager fm, List<CarouselItem> carouselItemsList) {
super(fm);
this.carouselItemsList = carouselItemsList;
}
@Override
public Fragment getItem(int position) {
return MainBannerFragmentNew.newInstance(R.drawable.gray_logo, carouselItemsList.get(position));
}
@Override
public int getCount() {
return carouselItemsList.size();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
}
}
以下是滑动标签适配器代码
Following is sliding tab adapter code
public class HomeTabsPagerAdapter extends FragmentPagerAdapter {
ArrayList<HomeTabItem> homeTabItems;
public HomeTabsPagerAdapter(FragmentManager manager, ArrayList<HomeTabItem> homeTabItems) {
super(manager);
this.homeTabItems = homeTabItems;
}
@Override
public Fragment getItem(int position) {
HomeTabItem homeTabItem = homeTabItems.get(position);
return OfferZoneFragment.newInstance(homeTabItem.getId());
}
@Override
public int getCount() {
return homeTabItems.size();
}
@Override
public CharSequence getPageTitle(int position) {
return homeTabItems.get(position).getTitle();
}
}
每个滑动标签片段都有recyclerview这个recylerview包含轮播viewpager以下是bindview中的代码
Every sliding tab fragment has recyclerview this recylerview contains carousel viewpager following is the code in bindview
((BannerHolder) holder).viewPager.setAdapter(new CarouselAdapter(fragmentManager, homePageItems.get(position).carouselItems));
((BannerHolder) holder).circlePageIndicator.setViewPager(((BannerHolder) holder).viewPager);
final float density = context.getResources().getDisplayMetrics().density;
((BannerHolder) holder).circlePageIndicator.setBackgroundColor(0x00000000);
((BannerHolder) holder).circlePageIndicator.setRadius(5 * density);
((BannerHolder) holder).circlePageIndicator.setFillColor(ContextCompat.getColor(context, R.color.appthemecolor));
((BannerHolder) holder).circlePageIndicator.setPageColor(0xFFFFFFFF);
((BannerHolder) holder).circlePageIndicator.setStrokeColor(0x00000000);
((BannerHolder) holder).circlePageIndicator.setStrokeWidth(2 * density);
if (((BannerHolder) holder).viewPager.getAdapter().getCount() <= 1) {
((BannerHolder) holder).circlePageIndicator.setVisibility(View.GONE);
} else {
((BannerHolder) holder).circlePageIndicator.setVisibility(View.VISIBLE);
}
推荐答案
您正在使用 getChildFragmentManager 获取正确的嵌套片段。
You are using getChildFragmentManager for nested fragments which is correct.
您正在做什么：
在您的情况下，片段要附加到（孩子的）viewpager，但此处viewpager没有附加到其父视图（仍然分离）。
In your case when the fragments wants to be attached to the (child's) viewpager but here the viewpager is not attached to its parent (still detached).
您应该做什么：
创建自定义 ViewPager 覆盖其 onAttachedToWindow 并执行惰性设置适配器。
Create a custom ViewPager override its onAttachedToWindow and do the lazy set adapter.
有关详细信息看看 IllegalArgumentException：无视图找到片段ID的内容-ViewPager中的ViewPager 。
更新：
如果要使用 getFragmentManager 或 getSupportFragmentManager 来更改的父类， PagerAdapter 从 android.support.v4.app.FragmentPagerAdapter 到 android.support.v4.app.FragmentStatePagerAdapter 。
If you want to use getFragmentManager or getSupportFragmentManager than change the parent class of your PagerAdapter from android.support.v4.app.FragmentPagerAdapter to android.support.v4.app.FragmentStatePagerAdapter.
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