AFAIK, the top left icon has no effect, other than whatever effect you
apply yourself. Just marking it as "up enabled" does not cause Android
to somehow magically know how to handle that. Instead, you have to
override onOptionsItemSelected() and watch for android.R.id.home and
do something there.
For example, in one of my activities that uses
setDisplayHomeAsUpEnabled(), I have:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return(true);
}
return(super.onOptionsItemSelected(item));
}
In this case, the flow is much like yours -- "up" equates to "back",
so I just finish() the current activity to make it happen.
If you are using startActivity() with FLAG_ACTIVITY_REORDER_TO_FRONT
to go "home", that's not going to immediately destroy your original
activity, any more than any other startActivity() call does.
So... what are you doing in onOptionsItemSelected()?
On Sat, Jun 4, 2011 at 7:22 PM, Christer Nordvik <[email protected]> wrote:
> I have two activities.
>
> 1. Home
> 2. Details
>
> In the details activity I set:
> ActionBar actionBar = this.getActionBar();
> actionBar.setDisplayHomeAsUpEnabled(true);
>
> and this causes the top left icon to act as a home button.
>
> But what I hadn't anticipated was that the details activity isn't
> destroyed when pressing the home button. If I press the back button
> then the activity is destroyed.
>
> Can anyone explain why the details activity isn't destroyed? Do I need
> to intercept the user clicking the home button and destroy the
> activity myself since I want to cleanup the image resources it uses...
>
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