相关疑难解决方法(0)

我有一个LoginActivity(用户登录).它基本上是它自己Activity的主题就像一个对话框(看起来像一个对话框).它出现在一个SherlockFragmentActivity.我想要的是:如果登录成功,应该有两个FragmentTransaction更新视图.这是代码:

在LoginActivity,如果成功登录,

setResult(1, new Intent());

在SherlockFragmentActivity:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == 1) {
        LoggedStatus = PrefActivity.getUserLoggedInStatus(this);
        FragmentTransaction t = MainFragmentActivity.this.getSupportFragmentManager().beginTransaction();
        SherlockListFragment mFrag = new MasterFragment();
        t.replace(R.id.menu_frame, mFrag);
        t.commit();

        // Set up Main Screen
        FragmentTransaction t2 = MainFragmentActivity.this.getSupportFragmentManager().beginTransaction();
        SherlockListFragment mainFrag = new FeaturedFragment();
        t2.replace(R.id.main_frag, mainFrag);
        t2.commit();
    }
}

它在第一次提交时崩溃,使用此LogCat:

E/AndroidRuntime(32072): Caused by: java.lang.IllegalStateException: Can not perform this action …