Question

我一直在导航抽屉的某些片段中实现导航抽屉和标签很长一段时间。问题永远不会出现，它仍然没有出现在少数片段中，但它只出现在导航抽屉中的两个片段中。

在导航栏中，每个项目代表一个由以下代码打开的片段

FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
currentFragment = new SomeFragment();
home_container_drawer_layout.closeDrawers();
fragmentTransaction = setFTAnimation(fragmentTransaction);
fragmentTransaction.replace(R.id.framelayout_activity_home, currentFragment).commitNow();

一旦加载了片段，我就使用我创建的ION包装器进行服务调用，并在响应时在该片段的ViewPager中动态设置选项卡

以下是设置标签监听器和设置viewpager adapter

的两个函数

 private void addListeners() {
        pager_account_cash_mail.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tablayout_fragment_account_cash_mail));
        tablayout_fragment_account_cash_mail.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {

        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            pager_account_cash_mail.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {
        }
    });
}
   private void setAdapter() {
        mAdapter = new CashMailPagerAdapter(this.getChildFragmentManager(), tabs_fragments_list);
        pager_account_cash_mail.setAdapter(mAdapter);
        pager_account_cash_mail.setOffscreenPageLimit(tabs_fragments_list.size());
    }

此外，我的代码包含addTab函数，该函数在服务响应后动态地将选项卡添加到选项卡布局中，并且在添加选项卡之后我调用这两个函数。

每当setAdapter行执行时，调试器进入viewpager适配器的getItem函数，一旦所有项都返回，应用程序崩溃说：

进程：com.foo.myapplication，PID：17278 java.lang.IllegalStateException：FragmentManager已经在执行事务在android.support.v4.app.FragmentManagerImpl.execSingleAction（FragmentManager.java:1626）在android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss（BackStackRecord.java:679）在android.support.v4.app.FragmentStatePagerAdapter.finishUpdate（FragmentStatePagerAdapter.java:166）在android.support.v4.view.ViewPager.populate（ViewPager.java:1240）在android.support.v4.view.ViewPager.populate（ViewPager.java:1088）在android.support.v4.view.ViewPager.onMeasure（ViewPager.java:1614）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1467）在android.widget.LinearLayout.measureVertical（LinearLayout.java:747）在android.widget.LinearLayout.onMeasure（LinearLayout.java:638）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）在android.view.View.measure（View.java:17356）在android.widget.RelativeLayout.measureChildHorizontal（RelativeLayout.java:727）在android.widget.RelativeLayout.onMeasure（RelativeLayout.java:463）在android.view.View.measure（View.java:17356）在android.support.v4.widget.DrawerLayout.onMeasure（DrawerLayout.java:1085）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）在android.support.v7.widget.ContentFrameLayout.onMeasure（ContentFrameLayout.java:135）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1467）在android.widget.LinearLayout.measureVertical（LinearLayout.java:747）在android.widget.LinearLayout.onMeasure（LinearLayout.java:638）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1467）在android.widget.LinearLayout.measureVertical（LinearLayout.java:747）在android.widget.LinearLayout.onMeasure（LinearLayout.java:638）在android.view.View.measure（View.java:17356）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5367）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）在com.android.internal.policy.impl.PhoneWindow $ DecorView.onMeasure（PhoneWindow.java:2576）在android.view.View.measure（View.java:17356）在android.view.ViewRootImpl.performMeasure（ViewRootImpl.java:2056）在android.view.ViewRootImpl.measureHierarchy（ViewRootImpl.java:1199）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1405）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1087）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6040）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:793）在android.view.Choreographer.doCallbacks（Choreographer.java:606）在android.view.Choreographer.doFrame（Choreographer.java:575）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:779）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:135）在android.app.ActivityThread.main（ActivityThread.java:5538） at java.lang.reflect.Method.invoke（Native Method）在java.lang.reflect.Method.invoke（Method.java:372）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:960）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:755）

IllegalStateException片段管理器已在使用中

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