问题描述
在多Fragment 切换时报了这个异常, google 搜了一些答案都没能解决这个问题.app 布局是这样的:刚开始是一个Fragment,里面有 viewpager ,viewpager 里面有三个 fragment, 然后是侧滑导航栏可切换到其他的 Fragment 但切换回来第一个界面的时候报了这个错误,不知道是布局的问题还是什么问题...是因为用了 v4 包的 Fragment 吗?看别人没用 v4包的 Fragment 不会报错,求解~
异常java.lang.IllegalStateException: FragmentManager is already executing transactions at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1631) at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679) at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) at android.support.v4.view.ViewPager.populate(ViewPager.java:1272) at android.support.v4.view.ViewPager.populate(ViewPager.java:1120) at android.support.v4.view.ViewPager.setOffscreenPageLimit(ViewPager.java:884) at com.muxistudio.jobs.ui.find.FindFragment.setupViewPager(FindFragment.java:69) at com.muxistudio.jobs.ui.find.FindFragment.initView(FindFragment.java:43) at com.muxistudio.jobs.ui.BaseFragment.onViewCreated(BaseFragment.java:42) at com.muxistudio.jobs.ui.find.FindFragment.onViewCreated(FindFragment.java:75) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1132) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1295) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1682) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:541) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)代码
第一个界面的 Fragment 中添加子 Fragment(在第二次切换到这个界面执行 mViewPager.setOffscreenPageLimit(2); 时抛出了这个异常)
for (int i = 0; i < 3; i++) { mTabLayout.addTab(mTabLayout.newTab().setText(titleList.get(i))); } mTabLayout.setBackgroundColor(Color.WHITE); mTabLayout.setTabTextColors(Color.BLACK, getResources().getColor(R.color.colorAccent)); List<Fragment> fragments = new ArrayList<>(); fragments.add(InfoFragment.newInstance(1)); fragments.add(InfoFragment.newInstance(2)); fragments.add(InfoFragment.newInstance(3)); FragmentAdapter adapter =new FragmentAdapter(getActivity().getSupportFragmentManager(), fragments, titleList); mViewPager.setAdapter(adapter); mViewPager.setOffscreenPageLimit(2); mTabLayout.setupWithViewPager(mViewPager);
切换 fragment
@Override public void showFragment(Fragment fragment) { getSupportFragmentManager().beginTransaction().replace(R.id.content, fragment).commit(); Logger.d((fragment instanceof FindFragment) + ''); if (fragment instanceof FindFragment) { invalidateOptionsMenu(); } }
OnNavigationItemClick(mMainView是MainActivity实现的一个接口对象,用了 MVP,来回切换就会报这个异常...)
@Override public void onNavigationItemClick(MenuItem item) { switch (item.getItemId()){ case R.id.action_find:mMainView.showFragment(FindFragment.newInstance());break; case R.id.action_date:break; case R.id.action_person:mMainView.showFragment(CollectionFragment.newInstance());break; case R.id.action_discuss:break; case R.id.action_setting:mMainView.showSetting();break; case R.id.action_about:break; } mMainView.setTitle(item.getTitle().toString()); }
问题解答
回答1：解决了，我这个问题放了几天后来去搜Stack OverFlow时发现有个回答解决了我的问题 FragmentManager is already executing transactions. When is it safe to initialise pager after commit?
FragmentAdapter adapter =new FragmentAdapter(getActivity().getSupportFragmentManager(), fragments, titleList);
要改为
FragmentAdapter adapter = new FragmentAdapter(getChildFragmentManager(),fragments,titleList);回答2：
楼主解决问题了没有，我和你遇到了一样的问题。
