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= Using HTTP =
There are many reasons to connect to a server from your application - most often you'll want to retrieve content from the web to display and manipulate in your app.
Any network operation can potentially take a very long time, so you'll have to do all your network stuff in a separate thread or AsyncTask.
== Connecting ==
You'll need to use an [http://developer.android.com/intl/ja/reference/java/net/HttpURLConnection.html HttpURLConnection].
Your app will get fewer bad reviews if it displays a good error message when a network is not available. See [http://developer.android.com/intl/ja/training/basics/network-ops/connecting.html#connection here] for a simple example of how to check the status of your connectivity.
// do something
}</source>
= Parsing XML =
= Reading and Writing JSON =