Opening and Closing an Application and Saving Data

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In Android, every application, also called an activity, is given a unique user ID and runs in its own process. The system—more specifically, the Activity Manager—manages the life cycle of applications and provides a common activity stack.

The application life cycle has three states: active, paused, and stopped. The Activity Manager keeps track of the list of application processes currently running, in order, from newest to oldest. If memory is needed, the oldest application is terminated first. It may receive an event first or be terminated at once.

The decision is therefore very much a result of the user’s interaction and history, with the current activity being the most important. AIR applications on Android are treated as any other application

While an application has a limited life cycle, it has the ability to save persistent data. Android provides an SQLite database, document-like data, as well as an internal state, which is a simple set of name/value pairs associated with an activity.

AIR uses its own APIs to save data. The AIR runtime comes with an SQLite engine and access to the filesystem. It also provides local shared objects, a cookie-like solution. We will go over all of these options.

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