java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

1、栈顶原因分析:

FragmentManager.checkStateLoss这里抛的异常,翻下源码会发现:如果FragmentTransaction.commit时候activity的状态被保存(即调用了onsaveInstance回调后),就会在这个地方抛这样的异常;

2、相关知识点:

a、在android HONEYCOMB(Api11)之前:onsaveinstance回调是在onpause之前,在Api11之后调整到了opause之后onstop之前;

b、从报错信息栈里可以看出我这个项目里用了:FragmentTabHost控件,FragmentTabHost在调用addTab时候会调事务的commit;

c、FragmentTransaction.commit接口是不允许在activity的状态保存之后调用(即调用了onsaveInstance回调后)

3、解决方案:

a、由于v4支持包中FragmentActivity的onsaveInstance回调存在bug,在回调这个方法时候有可能会有异常,这里重写这个方法不去调用super:

 @Override
    protected void onSaveInstanceState(Bundle outState) {
//        super.onSaveInstanceState(outState);
        //No call for super(). Bug on API Level > 11.
    }

b、使用FragmentTransaction.commitAllowingStateLoss来提交事务,但由于我这里提交事务是在源码里的,无法复写,故没法处理了;

c、通过复写FragmentTabHost的onAttachedToWindow方法捕获异常:

 @Override
    protected void onAttachedToWindow() {
        try {
            super.onAttachedToWindow();
        } catch (IllegalStateException e) {
            //由于ft.commit();
        }
    }

自己在项目采用的方式是:将onSaveInstanceState()中的super.onSaveInstanceState(outState)注释即可。

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