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Are there any good database abstraction layers/object relational mappers/ActiveRecord implementations/whatever they are called for Android? I'm aware that db4o is officially supported, but it has quite a large footprint and I'd rather use a more conventional database (SQLite).
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The data layer is made of repositories that each can contain zero to many data sources. You should create a repository class for each different type of data you handle in your app.
SQLite is a opensource SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation.
I am the main author of ORMLite which was designed to be small[ish] but still provide higher level functionality. ORMLite makes calls to the native Android OS database APIs to support its ORM functionality. See the following for general information
http://ormlite.com/sqlite_java_android_orm.shtml
Here are some Android example applications:
http://ormlite.com/docs/android-examples
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I tried the Sugar ORM, which is very basic (and easy to use) but it worked for my needs.
Sugar website
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