I got this issue.But I think this problem is not related to commit and commitAllowStateLoss.

The following stack trace and exception message is about commit().

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)

But this exception was caused by onBackPressed()

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)

They were all caused by checkStateLoss()

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 will be true after onSaveInstanceState.

This problem rarely happens.I have never encountered this problem.I can not reoccurrence the problem.

I found issue 25517

It might have occurred in the following circumstances

1. Back key is called after onSaveInstanceState, but before the new activity is started.

2. use onStop() in code

I'm not sure what the root of the problem is. So I used an ugly way.

@Override
public void onBackPressed() {
    
    try{
        super.onBackPressed();
    }catch (IllegalStateException e){
        // can output some information here
        finish();
    }
}

I got this issue.But I think this problem is not related to commit and commitAllowStateLoss.

The following stack trace and exception message is about commit().

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)

But this exception was caused by onBackPressed()

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)

They were all caused by checkStateLoss()

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 will be true after onSaveInstanceState.

This problem rarely happens.I have never encountered this problem.I can not reoccurrence the problem.

I found issue 25517

It might have occurred in the following circumstances

1. Back key is called after onSaveInstanceState, but before the new activity is started.

2. use onStop() in code

I'm not sure what the root of the problem is. So I used an ugly way.

@Override
public void onBackPressed() {
    
    try{
        super.onBackPressed();
    }catch (IllegalStateException e){
        // can output some information here
        finish();
    }
}

I replace all commit with commitAllowingStateLoss.

But this problem still occurs.I feel so confused about it.

The exception throw in

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);
    }
}

so I override onBackPressed()

@Override
public void onBackPressed() {

    try{
        super.onBackPressed();
    }catch (IllegalStateException e){
        finish();
    }
}

I got this issue.But I think this problem is not related to commit and commitAllowStateLoss.

The following stack trace and exception message is about commit().

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)

But this exception was caused by onBackPressed()

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)

They were all caused by checkStateLoss()

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 will be true after onSaveInstanceState.

This problem rarely happens.I have never encountered this problem.I can not reoccurrence the problem.

I found issue 25517

It might have occurred in the following circumstances

1. Back key is called after onSaveInstanceState, but before the new activity is started.

2. use onStop() in code

I'm not sure what the root of the problem is. So I used an ugly way.

@Override
public void onBackPressed() {
    
    try{
        super.onBackPressed();
    }catch (IllegalStateException e){
        // can output some information here
        finish();
    }
}