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While, as mentioned earlier, a desktop app is traditionally running as a monolithic process, a properly written Android app needs to be much more flexible as the user weaves their way through the different apps on their device, constantly switching flows and tasks.For example, consider what happens when you share a photo in your favorite social network app.The most important thing you should focus on is the separation of concerns in your app.It is a common mistake to write all your code in an .Because app components are ephemeral and their lifecycle (when they are created and destroyed) are not under your control, you should not store any app data or state in your app components and your app components should not depend on each other.If you can't use app components to store app data and state, how should apps be structured?A typical Android app is constructed out of multiple app components, including activities, fragments, services, content providers and broadcast receivers.Most of these app components are declared in the app manifest which is used by the Android OS to decide how to integrate your app into the overall user experience with their devices.



Models are components that are responsible for handling the data for the app.Also, the user could be interrupted by a phone call at any point in this process and come back to share the photo after finishing the phone call.In Android, this app-hopping behavior is common, so your app must handle these flows correctly.Keep in mind that mobile devices are resource constrained, so at any time, the operating system may need to kill some apps to make room for new ones.

The point of all this is that your app components can be launched individually and out-of-order, and can be destroyed at anytime by the user or the system.

The app triggers a camera intent from which the Android OS launches a camera app to handle the request.



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