我在ViewPager中有ListFragments，每个ListFragment都包含在一个活动中，并且有自己的选项菜单项，用户可以单击/点击以启动名为addEditItem的活动。现在，我想在addEditItem活动中provide up navigation，按该活动中的主页按钮（向上按钮）将返回ListFragment。我不知道我们是否可以Fragment指定Activity作为optionsItemSelectedItem的父级specify activies.我在addEditItem内部NullPointerException at navigateUpTo活动中尝试的内容如下（但这是通过@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent upIntent = NavUtils.getParentActivityIntent(this);
if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
// This activity is NOT part of this app's task, so create a new
// task
// when navigating up, with a synthesized back stack.
TaskStackBuilder.create(this)
// Add all of this activity's parents to the back stack
.addNextIntentWithParentStack(upIntent)
// Navigate up to the closest parent
.startActivities();
} else {
// This activity is part of this app's task, so simply
// navigate up to the logical parent activity.
Log.i(MyConstants.LOG_TAG, "navigate up to");
try {
NavUtils.navigateUpTo(this, upIntent);
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
default:
break;
}
return super.onOptionsItemSelected(item);
}
）：
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