Can not perform this action after onSaveInstance错误

测试部挂monkey，跑出个这么个崩溃日志，分析来分析去也没分析出什么问题。

从搜索来看，还是有人遇到这个问题。

记录下。

http://zhiweiofli.iteye.com/blog/1539467

关于onSaveInstance方法和commit方法之间的关系，在FragmentManager.java （./framework/base/core/java/android/app/FragmentManager.java）

/**
     * Start a series of edit operations on the Fragments associated with
     * this FragmentManager.
     *
     * <p>Note: A fragment transaction can only be created/committed prior
     * to an activity saving its state.  If you try to commit a transaction
     * after {@link Activity#onSaveInstanceState Activity.onSaveInstanceState()}
     * (and prior to a following {@link Activity#onStart Activity.onStart}
     * or {@link Activity#onResume Activity.onResume()}, you will get an error.
     * This is because the framework takes care of saving your current fragments
     * in the state, and if changes are made after the state is saved then they
     * will be lost.</p>
     */
    public abstract FragmentTransaction beginTransaction();

从上面可以看出，transaction的创建以及commit必须比activity的save要早。

从

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);
        }
    }

可以看出。

分析log，量的时候比较轻松，量多了，整个十几个压缩包，真是一件痛苦的事。

因此，分析log掌握方法很有必要。比如查找对应的导致FC的进程id，然后根据这个id 顺藤摸瓜，或者根据事件code，比如keyCode = 4 是返回键，此时，

adb等工具命令排上用场。