[android-developers] Re: ActionBar problems

Here's my class that accesses 3.0 related functionality. This is for
the invalidateOptionsMenu API which is now needed on 3.0 to update the
Action Bar properly:

public class SDKLevel11Bridge
{
private static final SDKLevel11Interface intf;

private interface SDKLevel11Interface
{
void invalidateOptionsMenu(Activity activity);
}

private static class SDKLevel11Interface4 implements
SDKLevel11Interface
{
SDKLevel11Interface4()
{
// Default constructor
}

@Override
public void invalidateOptionsMenu(Activity activity)
{
// Nothing
}
}

private static class SDKLevel11Interface11 implements
SDKLevel11Interface
{
SDKLevel11Interface11()
{
// Default constructor
}

@Override
public void invalidateOptionsMenu(Activity activity)
{
activity.invalidateOptionsMenu();
}
}

// Can't instantiate this class
private SDKLevel11Bridge()
{
// Nothing to do
}

static
{
if (SDKLevelUtil.isAtLeastLevel11())
intf = new SDKLevel11Interface11();
else
intf = new SDKLevel11Interface4();
}

public static void invalidateOptionsMenu(Activity activity)
{
intf.invalidateOptionsMenu(activity);
}
}

And the when I need to call the 3.0 API, I just do a:

SDKLevel11Bridge.invalidateOptionsMenu(this); // "this" is the
current Activity

On Mar 25, 6:24 am, Brion Emde <brione2...@gmail.com> wrote:
> Hi All,
>
> We're trying to use ActionBars on Honeycomb and stay backward
> compatible with earlier code. Everything seemed to be fine when we
> just used the default behaviors, like the upgrade of options menus to
> show in the action bar as Actions.
>
> But then the requirements got broader and they wanted us to start
> styling the action bar, setting its background, adding the "go to
> home" indicator to the icon and other things and we lost our backwards
> compatibility.
>
> I've been trying to figure it out and saw this paragaph in the "using
> action bars" document:
>
> ---
>
> In this example, the application requires a minimum version of API
> Level 4 (Android 1.6), but it also targets API Level 11 (Android 3.0).
> This way, when the application is installed on a device running
> Android 3.0 or greater, the system applies the holographic theme to
> each activity, and thus, each activity includes the Action Bar.
>
> However, if you want to use Action Bar APIs, such as to add tabs or
> modify Action Bar styles, you need to set the android:minSdkVersion to
> "11", so you can access the ActionBar class.
>
> ---
>
> This seems to say that if we want to talk to the ActionBar directly,
> i.e. use the Action Bar API, that we have to set our minSdkVerion="11"
> in the manifest.
>
> I'm having an argument with my boss, who thinks that since it "works"
> on Honeycomb, that the above excerpt does not apply to us. But I point
> out that when I comment out the code that tries to talk to the action
> bar directly, then I don't get Verify Errors on pre-Honeycomb devices.
> Everything used to work fine before we started trying to talk to the
> Action Bar directly.
>
> So, does that section, specifically the second paragraph that starts
> with "However", which seems to modify the paragraph before it, really
> apply? If so, why can we talk to the ActionBar on Honeycomb devices,
> despite our minSdkVersion="8".
>
> Our access to the action bar is wrapped in a wrapper class, as
> described in the "backwards compatilibility" article.
>
> Thanks!!

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