// java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(android.support.v4.app.Fragment)' on a null object reference
// at android.support.v4.app.Fragment.setUserVisibleHint(Fragment.java:801)
// at android.support.v4.app.FragmentPagerAdapter.setPrimaryItem(FragmentPagerAdapter.java:130)
// at android.support.v4.view.ViewPager.populate(ViewPager.java:1010)
// at android.support.v4.view.ViewPager.populate(ViewPager.java:881)
// at android.support.v4.view.ViewPager$3.run(ViewPager.java:237)
// at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1695)
// at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:1829)
// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2108)
// at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)
// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197)
// at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)
// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197)
// at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)
// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197)
// at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)
// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197)
// at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403)
// at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737)
// at android.app.Activity.dispatchTouchEvent(Activity.java:2771)
// at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364)
// at android.view.View.dispatchPointerEvent(View.java:9520)
// at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230)
// at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096)
// at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)
// at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)
// at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)
// at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787)
// at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)
// at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844)
// at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)
// at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)
// at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)
// at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)
// at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642)
// at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5922)
// at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5896)
// at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5857)
// at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6025)
// at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
// at android.os.MessageQueue.nativePollOnce(Native Method)
// at android.os.MessageQueue.next(MessageQueue.java:323)
// at android.os.Looper.loop(Looper.java:135)
// at android.app.ActivityThread.main(ActivityThread.java:5417)
// at java.lang.reflect.Method.invoke(Native Method)
// at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
// at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)