FragmentManager已經在執行交易

所以我有這個問題，當與FragmentStatePagerAdapter使用ViewPager，然後我試圖選擇當前頁面（即顯示第二頁到用戶，而不是第一個），我得到這個不時有例外。FragmentManager已經在執行交易

這個問題似乎是併發性的，因爲viewpager仍在添加/初始化片段，即當前正試圖設置當前頁面時正在運行片段事務。事情是這樣的：

pagerAdapter = new MyFragmentPagerAdapter(getChildFragmentManager()); 
viewPager.setAdapter(pagerAdapter); 
pagerAdapter.addItems(...) //Addings ID's here for each fragment, this is where the adapter notifies the viewpager 
viewPager.setCurrentItem(1); //This is where the two transactions at the same time might happen

的問題是：我應該怎麼知道什麼時候該viewpager完成初始化的片段，它的安全設置當前頁面？

確切的例外情況是這樣的：

Fatal Exception: 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.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166) 
    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.onMeasure(ViewPager.java:1646) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:703) 
    at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) 
    at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1367) 
    at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:768) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
    at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5972) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
    at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2693) 
    at android.view.View.measure(View.java:18916) 
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2231) 
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1307) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1549) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1198) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6268) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873) 
    at android.view.Choreographer.doCallbacks(Choreographer.java:676) 
    at android.view.Choreographer.doFrame(Choreographer.java:606) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859) 
    at android.os.Handler.handleCallback(Handler.java:739) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:168) 
    at android.app.ActivityThread.main(ActivityThread.java:5885) 
    at java.lang.reflect.Method.invoke(Method.java) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:687)

來源

2017-01-16 breakline

  Handler handler = new Handler(); 
      handler.post(new Runnable() { 
       @Override 
       public void run() { 
        viewPager.setCurrentItem(1); 
       } 
      });

來源

2017-05-22 15:24:53

FragmentManager已經在執行交易

回答

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