Android导航回“活动"；不要重新加载父母 [英] Android Navigate Back to Activity; Don't Reload Parent

问题描述

我有一个场景，我单击一个ListFragment并旋转一个新的Activity，如下所示:

I have a scenario where I am clicking on a ListFragment and spinning up a new Activity like below:

public void onListItemClick(ListView l, View v, int position, long id) {

  super.onListItemClick(l, v, position, id);

  Intent intent = new Intent(getActivity(), VenueBeerActivity.class);
  Parcelable wrapped = Parcels.wrap(mAdapter.getItem(position));
  intent.putExtra("venue", wrapped);

  startActivity(intent);
}

这可以正常工作并显示新活动.

This works fine and displays the new activity.

我修改了此活动清单，使其指向其父活动(在本例中为主要活动)

I've modified this activities manifest so it points back to its parent activity (in this case main activity)

但是我遇到的问题是，当按下后退按钮时，它会重新加载整个父级.父级是一个列表，我不希望它重新加载用户位置.我该如何预防?

However the problem I have is when the back button is pressed, it reloads the entire parent. The parent is a list and I don't want it to reload the users position. How can I prevent this?

请注意.父级包含页面标签条".

As a note. The parent houses a Page Tab Strip.

我确定这是一个相对简单的解决方法...

I'm sure this is a relatively simple fix...

推荐答案

后退按钮"是什么意思?它是工具栏中的向上按钮吗?如果是这种情况，请将VenueBeerActivity中的onOptionsItemSelected编辑为:

What do you mean by "back button"? Is it the up button in the toolbar? If that's the case, edit the onOptionsItemSelected in your VenueBeerActivity to:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case android.R.id.home:
            onBackPressed();
            return true;  
    }

    return super.onOptionsItemSelected(item);
}

因此，当用户按下向上按钮时，它将在导航栏中显示后退按钮的行为.

So when user press the Up button it will get the behavior of the back button in the navigation bar.

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