android – 崩溃删除片段

概述我的平板电脑崩溃对我来说非常神秘： java.lang.NullPointerException: Attempt to read from field 'int android.support.v4.app.Fragment.mContainerId' on a null object reference 我的平板电脑崩溃对我来说非常神秘：

java.lang.NullPointerException: Attempt to read from fIEld 'int androID.support.v4.app.Fragment.mContainerID' on a null object reference                                                                             at androID.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1012)                                                                             at androID.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:971)                                                                             at androID.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:95)                                                                             at androID.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2143)                                                                             at androID.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2098)                                                                             at androID.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2008)                                                                             at androID.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:710)                                                                             at androID.os.Handler.handleCallback(Handler.java:751)                                                                             at androID.os.Handler.dispatchMessage(Handler.java:95)                                                                             at androID.os.Looper.loop(Looper.java:154)                                                                             at androID.app.ActivityThread.main(ActivityThread.java:6077)                                                                             at java.lang.reflect.Method.invoke(Native Method)                                                                             at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)                                                                             at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:755)

它只发生在我的API 24 Pixel C上.调试模式无法帮助我找出它的位置.当我删除一个删除片段的按钮时会发生这种情况,但代码的“片段删除”部分会被正确执行,执行我的OnClickListener后会发生一些事情.

我删除了交易动画并遇到了同样的崩溃.

以前有人经历过吗？

谢谢

解决方法 似乎解决方案不是保留片段的引用,而是使用标记找到它：

之前：

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();courseLauncherFragment = CourseLauncherFragment.newInstance(courseID);fragmentTransaction.replace(R.ID.launcher_finish_frame_layout,courseLauncherFragment);fragmentTransaction.commit();getSupportFragmentManager().executePendingTransactions();

然后删除它：

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.setCustomAnimations(R.anim.slIDe_in_left,R.anim.slIDe_out_left);fragmentTransaction.remove(courseLauncherFragment);fragmentTransaction.commit();

现在 ：

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.replace(R.ID.launcher_finish_frame_layout,CourseLauncherFragment.newInstance(courseID),LAUNCHER_FRAGMENT_TAG);fragmentTransaction.commit();getSupportFragmentManager().executePendingTransactions();

然后 ：

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.setCustomAnimations(R.anim.slIDe_in_left,R.anim.slIDe_out_left);Fragment fragment = fragmentManager.findFragmentByTag(LAUNCHER_FRAGMENT_TAG);fragmentTransaction.remove(fragment);fragmentTransaction.commit();

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