SharedElement导致活动转换崩溃

Question

我正在使用来自ViewPager（在调用活动中）的活动转换，以及共享元素和内容转换。我得到这个崩溃时，重新进入调用活动：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.os.ResultReceiver.send(int, android.os.Bundle)' on a null object reference
  at android.app.EnterTransitionCoordinator.sendSharedElementDestination(EnterTransitionCoordinator.java:199)
  at android.app.EnterTransitionCoordinator.viewsReady(EnterTransitionCoordinator.java:123)
  at android.app.EnterTransitionCoordinator$2.onPreDraw(EnterTransitionCoordinator.java:148)
  at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:895)
  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2153)
  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1180)
  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6558)
  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
  at android.view.Choreographer.doCallbacks(Choreographer.java:590)
  at android.view.Choreographer.doFrame(Choreographer.java:560)
  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
  at android.os.Handler.handleCallback(Handler.java:739)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:145)
  at android.app.ActivityThread.main(ActivityThread.java:5832)
  at java.lang.reflect.Method.invoke(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)

此外，一旦返回，屏幕开始持续闪烁，白色屏幕来回闪烁。

以下是我的转换标志：

<item name="android:windowContentTransitions">true</item>
<item name="android:windowActivityTransitions">true</item>
<item name="android:windowAllowReturnTransitionOverlap">false</item>

我尝试在调用和调用活动上设置进入/退出转换，但没有运气。

Answer 1

尝试从FragmentManager获取片段：

fragmentManager.findFragmentByTag("android:switcher:" + R.id.viewPager + ":" + position)

如果片段为null，请尝试创建新片段。