我有一个Live Android应用程序,从市场上我收到了以下堆栈跟踪,我不知道为什么它会发生,因为它不是发生在应用程序代码中,而是由应用程序的一些或其他事件引起的(假设)
我没有使用片段,仍然有一个FragmentManager的参考。
如果有人能揭示一些隐藏的事实,以避免这类问题:
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399)
at android.app.Activity.onBackPressed(Activity.java:2066)
at android.app.Activity.onKeyDown(Activity.java:1962)
at android.view.KeyEvent.dispatch(KeyEvent.java:2482)
at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1720)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1258)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2851)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2824)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2011)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4025)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at dalvik.system.NativeStart.main(Native Method)
好吧,在尝试了以上所有的解决方案都没有成功(因为基本上我没有事务)。
在我的情况下,我使用alertdialog和ProgressDialog作为片段,有时,在旋转时,当请求FragmentManager时,错误会上升。
我找到了一个混合了许多类似帖子的变通方法:
这是一个3步解决方案,所有在你的FragmentActivity(在这种情况下,它被称为GenericActivity):
private static WeakReference<GenericActivity> activity = null; //To avoid bug for fragments: Step 1 of 3
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//To avoid bug for fragments: Step 2 of 3
activity = new WeakReference<GenericActivity>(this);
}
@Override
public FragmentManager getSupportFragmentManager(){
//To avoid bug for fragments: Step 3 of 3
if (this == activity.get()) {
return super.getSupportFragmentManager();
}
return activity.get().getSupportFragmentManager();
}
我有这个问题。但是我认为这个问题与commit和commitAllowStateLoss无关。
下面的堆栈跟踪和异常消息是关于commit()的。
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1341)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1352)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
但是这个异常是由onBackPressed()引起的
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(Unknown Source)
at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(Unknown Source)
at android.support.v4.app.FragmentActivity.onBackPressed(Unknown Source)
它们都是由checkStateLoss()引起的
private void checkStateLoss() {
if (mStateSaved) {
throw new IllegalStateException(
"Can not perform this action after onSaveInstanceState");
}
if (mNoTransactionsBecause != null) {
throw new IllegalStateException(
"Can not perform this action inside of " + mNoTransactionsBecause);
}
mStateSaved在onSaveInstanceState之后为真。
这个问题很少发生。我从来没有遇到过这个问题。我不能再出现这个问题。
我找到了25517号
它可能在下列情况下发生
Back键在onSaveInstanceState之后,但在新活动开始之前被调用。
在代码中使用onStop()
我不确定问题的根源是什么。
所以我用了一个丑陋的方法。
@Override
public void onBackPressed() {
try{
super.onBackPressed();
}catch (IllegalStateException e){
// can output some information here
finish();
}
}