报如下异常：java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

[HolenZhou]

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1377)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1395)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:637)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:616)
at com.talkweb.cloudcampus.view.ActionSheet.show(ActionSheet.java:65)
at com.talkweb.cloudcampus.view.ActionSheet$Builder.show(ActionSheet.java:482)
at com.talkweb.cloudcampus.ui.common.ImageViewPagerActivity.LongPress(ImageViewPagerActivity.java:128)
at com.talkweb.cloudcampus.ui.common.ImageViewPagerActivity$ImagePagerAdapter$2.onLongClick(ImageViewPagerActivity.java:155)
at com.talkweb.cloudcampus.view.gallery.touchview.TouchImageView$1.onLongPress(TouchImageView.java:146)
at android.view.GestureDetector.dispatchLongPress(GestureDetector.java:690)
at android.view.GestureDetector.access$200(GestureDetector.java:37)
at android.view.GestureDetector$GestureHandler.handleMessage(GestureDetector.java:266)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5372)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)

很难复现的情况，不知道是不是使用方法的问题？

[baoyongzhang]

当Activity不在前台的时候，系统可能会回收的时候会调用onSaveInstanceState，这时候再show就会出现这个异常。将show方法里面的commit改为commitAllowingStateLoss应该可以解决。

[HolenZhou]

我试了将commit改为commitAllowingStateLoss，也查过原因应该是当前Activity被回收造成的，但是我无法复现这个crash，不知是不是有什么方法可以复现这个crash呢？因为有其他地方有类似的crash，如果可以复现，我就可以测试是否真正解决，我自己通过更改手机字体大小来模拟内存回收，但也没演示出bug，请大牛指点，非常感谢！

[XingmingLi]

@HolenZhou
用Handler延迟执行一个继承自DialogFragment的对话框的显示。显示前按home，就可以出现这个错。
我的解决办法（针对对话框）：
`override fun show(manager: FragmentManager?, tag: String?) {
if (manager == null)
return

    if (Integer.valueOf(android.os.Build.VERSION.SDK) > Build.VERSION_CODES.JELLY_BEAN) {
        if (manager.isDestroyed)
            return
    }

    try {
        super.show(manager, tag)
    } catch (e: Exception) {
        e.printStackTrace()
    }
}`