Fatal Exception: java.lang.NullPointerException при использовании ViewPager

Я использую ViewPager в своем приложении, чтобы показать 3 фрагмента в закладках. После Крэш сообщается в Dev консоли без подробного указателя к проблемеFatal Exception: java.lang.NullPointerException при использовании ViewPager

Ошибка:

Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference

И Ниже крах деталь -

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference 
    at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1613) 
    at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:633) 
    at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
    at android.support.v4.view.ViewPager.populate(ViewPager.java:1177) 
    at android.support.v4.view.ViewPager.populate(ViewPager.java:1025) 
    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545) 
    at android.view.View.measure(View.java:18880) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
    at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668) 
    at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:735) 
    at android.view.View.measure(View.java:18880) 
    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716) 
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462) 
    at android.view.View.measure(View.java:18880) 
    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716) 
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462) 
    at android.view.View.measure(View.java:18880) 
    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:135) 
    at android.view.View.measure(View.java:18880) 
    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:18880) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
    at android.view.View.measure(View.java:18880) 
    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:18880) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5952) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
    at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2650) 
    at android.view.View.measure(View.java:18880) 
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2104) 
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1220) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1456) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1111) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6017) 
    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:224) 
    at android.app.ActivityThread.main(ActivityThread.java:5526) 
    at java.lang.reflect.Method.invoke(Method.java) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Любой сталкивался подобной проблемой и что может быть решением?

источник

2016-05-22 user669231

напишите свой код Java здесь. – Ironman

добровольно опубликуйте свой код, возможно, проблема в том, как вы используете FragmentManager и проверяете эту тему http://stackoverflow.com/questions/34332900/android-support-v4-app-fragmentmanagerpopbackstackimmediate-results-in-a- null –

почтовый код, другое предложение было бы использовать этот учебник http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/ – Manny265

Я столкнулся с этим и когда-нибудь. Я не знаю, используете ли вы Handler (android.os.handler) в этом случае. Если вы используете, убедитесь, что вы инициализировали его onCreate. После инициализации я решил этот тип ошибки log cat

источник

2016-05-22 06:00:59 user6363583

Fatal Exception: java.lang.NullPointerException при использовании ViewPager

ответ

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