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POSetting Android Background & Persistence Menu Bar - Using attribute on older versions causes crash - Is there a theme /pattern approach?
 

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  1. POSetting Android Background & Persistence Menu Bar - Using attribute on older versions causes crash - Is there a theme /pattern approach?
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    <p>In Android 3.0, the concept of "checked" can be rendered using an "activated" background. This gives you the persistent bar you see when you tap on a list fragment, providing context for the fragment to the list's right (e.g., tapping on a folder in Gmail highlights that folder and opens up another list fragment to show the conversations in that folder).</p> <p>For example, the fragment samples show stuff like:</p> <pre><code>setListAdapter(new ArrayAdapter&lt;String&gt;(getActivity(), android.R.layout.simple_list_item_activated_1, Shakespeare.TITLES)); </code></pre> <p>That resource (<code>android.R.layout.simple_list_item_activated_1</code>) is new to Android 3.0. What makes it "activated" is:</p> <pre><code>android:background="?android:attr/activatedBackgroundIndicator" </code></pre> <p>That attribute value is new to Android 3.0 and will cause you to crash if you try using it on earlier versions of Android, from what I can tell. I want to set the background to this magic value for the 3.0/large/landscape combination, and skip it otherwise.</p> <p>I can accomplish this by having two separate versions of the layout, one in a <code>-v11</code> resource set, one in a regular resource set. This is a bit less DRY than I'd like, though, since the bulk of the layout is the same, with only this one attribute either being included or being skipped.</p> <p>I took a stab at trying to use drawable resource aliases, so the <code>android:background</code> could refer to the alias and the alias would handle the <code>-v11</code> differentiation, but <code>&lt;bitmap&gt;</code> drawables don't seem to like <code>android:src="@null"</code>.</p> <p>I suspect there's a styles-and-themes approach to this problem, but since I've never fully wrapped my head around those (one of my more embarrassing Android knowledge gaps), I'm not completely sure what to do.</p> <p>Has anyone worked out a pattern for using "activated" on 3.0 and skipping it on pre-3.0, beyond separate layouts?</p> <p>Thanks!</p>
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    1. USMichael Durrant
    1. USCommonsWare
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    1. COCan't <include /> work here? Or different versions of a theme maybe?
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      1. USalexanderblom
    2. CO@alexanderblom: `<include>` wouldn't help here -- I need the background on the root element of the row layout. "different versions of a theme" is certainly in the realm of possibility, but that's why I'm asking the question. :-)
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      1. USCommonsWare
    3. COyeah at first glance themes separated out -v11 or not seem to be the way to go. Less copy/pasting that doing an entire layout at least :/
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      1. USschwiz
 

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