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    Activity Life Cycle

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    tanveer Mulla
    An Android activity represents a single screen in an app. It has a lifecycle with states like foreground, background, and paused. The activity lifecycle involves various callback methods like onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() that control when an activity is visible, active, or destroyed. Activities transition between states like foreground and background based on user interactions with the app or other apps.

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    Activity Life Cycle

    Uploaded by

    tanveer Mulla
    31 views8 pages
    An Android activity represents a single screen in an app. It has a lifecycle with states like foreground, background, and paused. The activity lifecycle involves various callback methods like onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() that control when an activity is visible, active, or destroyed. Activities transition between states like foreground and background based on user interactions with the app or other apps.

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    An Android activity represents a single screen in an app. It has a lifecycle with states like foreground, background, and paused. The activity lifecycle involves various callback methods like onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() that control when an activity is visible, active, or destroyed. Activities transition between states like foreground and background based on user interactions with the app or other apps.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    31 views8 pages

    Activity Life Cycle

    Uploaded by

    tanveer Mulla
    An Android activity represents a single screen in an app. It has a lifecycle with states like foreground, background, and paused. The activity lifecycle involves various callback methods like onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() that control when an activity is visible, active, or destroyed. Activities transition between states like foreground and background based on user interactions with the app or other apps.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 8

    Android Activity

    and
    Activity Life Cycle
    Android Activity:
    • Activity is a single page application with some UI components.
    • An activity is a Java file.
    • We know that for every individual screen or activity in android we
    need two things
    1. XML File
    2. Java File
    • XML file is called as layout and Java file is called as activity.
    • There are no. of stages are involved in activity phases so it called
    as activity life cycle.
    Android Activity Life Cycle:
    Activity class is having some of major methods which will be
    participate in an activity life cycle, these methods are shown below
    1. onCreate()
    2. onStart()
    3. onResume()
    4. onPause()
    5. onStop()
    6. onRestart()
    7. onDestroy()
    Android Activity Life Cycle (Continued….):
    Android Activity Life Cycle (Continued….):
    There are four states of an activity in activity life cycle.
    1. Activity in does not exist state:
    Means that activity currently is not started.
    2. Activity is in foreground state:
    • Whenever we are opening any application by using any
    device, we see the home page of that application, means the
    activity is in foreground state i.e. an activity comes from does
    not exist state to foreground state.
    • An activity comes from does not exist state to foreground state
    by calling 3 major methods
    onCreate(), onStart(), onResume()
    • Above 3 major methods are invoked to start on activity.
    • The current visible activity is destroyed by calling following 3
    major methods
    onPause(), onStop(), onDestroy()
    Android Activity Life Cycle (Continued….):
    3. Activity is in background state:
    • Whenever we are opening any secondary page of an existing
    application or opening another new application then some
    other activity comes into foreground state and current visible
    activity goes into background state.
    • An activity goes from foreground state to background state by
    calling following 2 major methods
    onPause(), onStop()
    • Above 2 major methods are invoked to turn a current activity
    from foreground state to background state.
    • A background state activity turns into a foreground state by
    calling following 3 major methods
    onRestart(), onStart(), onResume()
    Android Activity Life Cycle (Continued….):
    3. Activity is in background state:
    • Whenever we are opening any secondary page of an existing
    application or opening another new application then some
    other activity comes into foreground state and current visible
    activity goes into background state.
    • An activity goes from foreground state to background state by
    calling following 2 major methods
    onPause(), onStop()
    • Above 2 major methods are invoked to turn a current activity
    from foreground state to background state.
    • A background state activity turns into a foreground state by
    calling following 3 major methods
    onRestart(), onStart(), onResume()
    Android Activity Life Cycle (Continued….):
    4. Activity is in paused state:
    • An activity turns or enters from foreground state to pause state
    by calling onPause() method.
    • An activity turns or enters from pause state to foreground state
    by calling onResume() method.

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