When an activity transitions into and out of the different lifecycle states as it runs, the Android system calls several lifecycle callback methods at each stage. As the user interacts with your app and other apps on the device, the different activities move into different states.Ĩ Contd. Here is a skeleton subclass of AppCompatActivity:ħ Activity Life Cycle The activity lifecycle is the set of states an activity can be in during its entire lifetime, from the time it is initially created to when it is destroyed and the system reclaims that activity's resources. ![]() The AppCompatActivity class is a subclass of Activity that lets you to use up- to-date Android app features such as the action bar and material design, while still enabling your app to be compatible with devices running older versions of Android. Override the standard Activity Lifecycle Callback onCreate() must be implemented. When you create a new project for your app, or add a new activity to your app, in Android Studio (with File > New > Activity), template code for each of these tasks is provided for you.Ĭreate an Activity Class that extends Activity class or any of its subclass. Declare that new activity in the app manifest. Implement a user interface for that activity. Ĥ Creating Activities To implement an activity in your app, do the following: Create an activity Java class. For example, a messaging app you write could start an activity in a camera app to take a picture, and then start the activity in an app to let the user share that picture in. Your app is a collection of activities that you either create yourself, or that you reuse from other apps. An activity is usually presented to the user as a full-screen window. ![]() Example: taking a photo, sending an, or viewing a map. Mobile Programming Activities and Intentsģ Activity An Activity represents a single screen in your app with which your user can perform a single, focused task.
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