java.lang.IllegalStateException：已添加片段：NamedFragment

我希望你們中的許多人遇到此問題。情景非常簡單，我有一個ViewPager活動。在那個ViewPager中，我需要顯示兩個片段或一個基於邏輯的片段。因此，我從FragmentPagerAdapter創建了一個ViewPagerAdapter，並根據條件動態添加片段。然而，它不工作，並給出以下錯誤，java.lang.IllegalStateException：已添加片段：NamedFragment

java.lang.IllegalStateException: Fragment already added: NamedFragment{2c7b548 #0 id=0x7f0e0097 android:switcher:2131624087:0} 
                      at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1669) 
                      at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:720) 
                      at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2303) 
                      at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2132) 
                      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.onMeasure(ViewPager.java:1642) 
                      at android.view.View.measure(View.java:18805) 
                      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716) 
                      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462) 
                      at android.view.View.measure(View.java:18805) 
                      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716) 
                      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462) 
                      at android.view.View.measure(View.java:18805) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
                      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:18805) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
                      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:18805) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                      at android.view.View.measure(View.java:18805) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
                      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:18805) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                      at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643) 
                      at android.view.View.measure(View.java:18805) 
                      at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100) 
                      at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216) 
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452) 
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) 
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) 
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 
                      at android.view.Choreographer.doCallbacks(Choreographer.java:670) 
                      at android.view.Choreographer.doFrame(Choreographer.java:606) 
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) 
                      at android.os.Handler.handleCallback(Handler.java:739) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:148) 
                      at android.app.ActivityThread.main(ActivityThread.java:5417) 
                      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)

請有人幫我解決它。

謝謝

來源

2017-01-06 RRaveen

，因爲它說，你在兩次相同內容的佈局添加相同的片段。你應該使用replace（）而不是add（）來避免這種情況。

來源

2017-01-06 01:40:33 fly904021125

嗨，我只打了一次我的方法，所以我相信我沒有添加兩次，謝謝 – RRaveen

您不應該將片段手動添加到viewpager，而應使用FragmentPagerAapter使用FragmentStatePagerAdapter，然後使用適配器的notifydatasetchange（）方法動態更改viewpager顯示的片段數。我不會給你的代碼，但方向

來源

2017-01-06 03:22:33

「因此，我創建了一個來自FragmentPagerAdapter的ViewPagerAdapter並動態添加片段庫條件「爲ViewPagerAdapter。我正在按照您所提到的方式進行操作，但仍然出現此錯誤。爲什麼 – RRaveen

您是否使用notifydatasetchange？ –

檢查此鏈接https://medium.com/inloop/adventures-with-fragmentstatepageradapter-4f56a643f8e0#.vs2ua2izs –

java.lang.IllegalStateException：已添加片段：NamedFragment

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