FRAGMENT LIFECYCLE IN ANDROID ANDROID
FRAGMENT LIFECYCLE IN ANDROID SOFTWARE

The restarted activity will then become the foreground activity again.

onRestart - If the user returns to the app before the activity has fully shut down, then the activity can be restarted via the onRestart stage.It is recommended to perform intensive operations in the onStop stage rather than the onPause stage because the onPause stage can often finish quickly when the app is shutting down. The onStop stage is where you should perform the most intensive shutdown processes such as saving data. onStop - An activity enters the onStop stage when it is no longer visible to the user.For example, the onPause stage can be used to disconnect from cameras and sensors or stop processes that might otherwise cause an unnecessary drain on the device's processing power and battery life. Typically, the onPause stage is used to stop processes that may be expected to resume again shortly if the activity returns to the foreground. For example, the activity may be one of multiple activities being displayed simultaneously on devices that support multi-window mode. The loss of foreground status usually means the activity is no longer visible, but not always. onPause - The onPause stage occurs when the activity is no longer the foreground activity.An activity remains in the onResume stage until it loses its foreground status. onResume - Activities in the onResume stage are visible to the user and are prioritised for system resources.You could use the onStart stage to handle processes related to displaying the user interface to the user. onStart - In the onStart stage, the activity enters the Started state and prepares to enter the device's foreground, which means the activity will be prioritised when the device allocates system resources.Also, the onCreate stage is when you would retrieve any state information that is stored if that the activity is temporarily destroyed and restarted such as when the user rotates the device. For example, you should initialise the activity's user interface layout and supporting components such as view models. At which point, you should define any processes that should persist throughout the lifetime of the activity. In the onCreate stage, the activity enters the Created state.

FRAGMENT LIFECYCLE IN ANDROID ANDROID

onCreate - The first stage in the Android activity lifecycle is onCreate.To better understand the Android activity lifecycle, a diagram and explanation of the different stages are included below: In which case, it may forcibly shut down apps such as yours and any activities that are in the onStop stage of their lifecycle.

The device may determine that it does not have sufficient computational resources to keep idle apps running in the background. However, imagine the user does not return for a while and other apps are required to perform more complex and urgent tasks. In which case, the activity from your app will no longer be visible but could be resumed if the user returns to your app.

For example, if the user switches to another app but leaves your app running in the background, then the activity from your app will enter the onPause and onStop stages of its lifecycle. Also, the lifecycle states are related to how much computational resources the device will allocate to the app, and hence the activity. The collection of states is called the activity lifecycle, and each state is associated with a different level of readiness for the activity and its components. The Android activity lifecycleĪn Android activity progresses through various states from the moment it is opened until it is closed. In this tutorial, we will explore the purpose of each lifecycle stage, discuss how you can provide custom instructions for a given stage, and compare the relationship between the activity and fragment lifecycles. An awareness of the lifecycle states for activities and fragments is critical for designing robust Android applications that perform effectively. Activities and fragments also have lifecycles, which describe a sequence of state changes the components progress through from their creation until they are destroyed. A fragment must be tied to an activity, but an activity can exist without fragments. For example, if you are designing a Music Player app, you might use an activity to coordinate the music library and have separate fragments within the activity for the Albums view, Artists view and Playlists view. Meanwhile, a fragment is a module within an activity. An activity describes a unit of the application that is dedicated to a task, such as drafting an email. The Android Activity and Fragment lifecyclesĪctivities and fragments are core Android application components.

Interacting with the Android fragment lifecycle stages.

Interacting with the Android activity lifecycle stages.

The Android Activity and Fragment lifecycles.

FRAGMENT LIFECYCLE IN ANDROID SOFTWARE

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Fragment lifecycle in android