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    <p>That attribute is basically the persistence for the "Associated Activity" selection above the layout. At runtime, a layout is always associated with an activity. It can of course be associated with more than one, but at least one. In the tool, we need to know about this mapping (which at runtime happens in the other direction; an activity can call setContentView(layout) to display a layout) in order to drive certain features.</p> <p>Right now, we're using it for one thing only: Picking the right theme to show for a layout (since the manifest file can register themes to use for an <em>activity</em>, and once we know the activity associated with the layout, we can pick the right theme to show for the layout). In the future, we'll use this to drive additional features - such as rendering the action bar (which is associated with the activity), a place to add onClick handlers, etc.</p> <p>The reason this is a tools: namespace attribute is that this is only a designtime mapping for use by the tool. The layout itself can be used by multiple activities/fragments etc. We just want to give you a way to pick a designtime binding such that we can for example show the right theme; you can change it at any time, just like you can change our listview and fragment bindings, etc.</p> <p>(Here's the full changeset which has more details on <a href="https://android-review.googlesource.com/#/c/36273/">this</a>)</p> <p>And yeah, <a href="http://tools.android.com/recent/newconfigchooser">the link</a> Nikolay listed above shows how the new configuration chooser looks and works</p> <p>One more thing: The "tools" namespace is special. The android packaging tool knows to ignore it, so none of those attributes will be packaged into the APK. We're using it for extra metadata in the layout. It's also where for example the attributes to suppress lint warnings are stored -- as tools:ignore. </p>
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    1. POWhat's "tools:context" in Android layout files?
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    1. USTor Norbye
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    1. COhow does it know the full path to the activity if it has no base package ? does it look at the manifest file?
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    2. COYes, it's treating it the same way as activity registrations in the manifest file, where you can also omit the package in the name attribute. It prepends the package declaration from the manifest file root element, if necessary.
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    3. COnice . will all of this (and more) be shown at google io 2012 ? i can't wait to hear about the new features . :)
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