![]() The OS invokes these callbacks when the activity moves from one state to another. Notice different callbacks between states. Destroyed: Activity is destroyed and the OS can reclaim its memory.In this state, the user is likely interacting with the activity. Resumed: Activity is visible to the user and has focus.Started: Activity is visible to the user.Created: Activity is now completely initialized and ready to configure its UI.Initialized: Activity instance is created and its properties initialized.The figure above shows different states that activity goes through during its lifecycle: Not using these components correctly can result in the system killing the process while it’s doing important work. As the user navigates within the app, activities go through different lifecycle states.ĭevelopers must understand how different components impact the process’s lifetime. Every Android app has one or more activities. The most common app component is Activity. That type depends on the app components that are currently running and their current state. The importance hierarchy categorizes processes as different types. ![]() The Android OS uses an importance hierarchy to determine which processes to keep alive or to kill. When no app component is running and the OS needs to free memory to run other apps, it kills the process. The OS creates the process when any of the app components need to execute. In most cases, every app runs in its own Linux process. ![]() The Android operating system (OS) is a multi-user Linux system. Understanding the Role of the Lifecycle in Apps Pupp圜ounterApplication: the app class.īefore going into details of the activity lifecycle, here’s some background on the lifecycle’s role in Android apps.SplashActivity: a splash activity that opens up when you start the app.Besides those packages, notice these three things: You’ll become familiar with classes inside as you go through the tutorial. Right now, don’t worry about the details. You’ll move between them as you learn about activity and fragment lifecycle. The most important packages are activities and fragments. :]Īs you can see, a lot is already prepared for you. In this tutorial, you won’t implement that logic, but you can pretend that it exists. Tap Share to open a dialog that asks you if you want to share your count. Share screen: Displays your dog count.In the top bar, you have two buttons: The first one resets the values and the second one opens the Share screen. You can tap the cards or the plus and minus buttons to update the counters. Main screen: Allows you to count dogs of different sizes.Once the project opens, let it build and sync, and you’ll be ready to go! Open the starter project in Android Studio. ![]() To start, download the materials by using the Download Materials button at the top or bottom of this tutorial.
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