August 2016
Intermediate to advanced
360 pages
8h 44m
English
Content preview from Seven Mobile Apps in Seven WeeksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Day 2: What Can I Get for a Buck?
Or, Building a Conversion Interface
We’ve got a solid foundation in place for getting data to and from the API. Now let’s get into building an interface for the app.
Building an Interface
To allow the user to be able to do the conversion of one currency to another, we’ll need an interface. Android’s interface definition is done mostly in XML, with sensible layout language and a very powerful system for dealing with device differences. Let’s start by building a form for the user to specify two currencies and convert an amount in one to an amount in the other.
Creating a Linear Layout
The activity_convert.xml layout is the view that ConvertActivity manages. Here’s the first line of input fields for currencies. ...
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