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Should I use several activities for an app with several screens?

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http://stackoverflow.com – I'm new to Android and I'm building a simple application to start with. It consists of a client with three screens. In the first screen the user is prompted for an Ip to connect to a server (I use an EditText and a button). If the connection is successfully established, some data will be retrieved from the server and the client will show the data on a blank screen (I use a TextView). This would be the second screen. Then, the user could ask the server for detailed information about any data that has been retrieved from the server, which would be the third screen (I use a TextView again). The (HowTos)