What is the best UI Java markup language for designing applications for Google Android? [closed]

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What is the best (meaning: most popular) UI Java markup language for designing applications for Google Android?

So i will say something like

<Application layout="vertical">
 <Panel width="250" height="200" layout="vertical" horizontalAlign="center" 
 verticalAlign="middle" title="This is a panel">
  <Button label="This is a button"/>
 </Panel>
</Application>

and get something like

_{(source: vdrillpro.net)}

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Er, the Android one? I'm not aware of any alternative either.