Hence, all in all there are four states of an Activity(App) in Android namely,
Active , Paused , Stopped and Destroyed
. From the user’s perspective, The activity is either visible, partially visible or invisible at a given point of time.
What is instance state and how is it used in activities?
The state of each activity is
stored as a set of key/value pairs in a Bundle object
called the activity instance state. The system saves default state information to instance state bundle just before the activity is stopped, and passes that bundle to the new activity instance to restore.
What is the activity lifecycle?
The activity lifecycle is
the set of states an activity can be in during its entire lifetime
, from the time it’s created to when it’s destroyed and the system reclaims its resources. As the user interacts with your app and other apps on the device, activities move into different states.
How does an activity know about change in states?
As it is known that android has launched a multi-window feature for the Android 7 for the apps with API level 24 and higher, so when any configuration changes of the android app, the android system notify such events and change the lifecycle states of the activity according to
the conditions in which configuration of
…
Which of the following is not a state in the service lifecycle?
| Q. Which of the following is NOT a state in the lifecycle of a service? | B. running | C. destroyed | D. paused | Answer» d. paused |
|---|
Which is not state of an activity?
| State Description | Stopped Activity is not visible, instance is running but might be killed by the system. | Killed Activity has been terminated by the system of by a call to its finish() method. |
|---|
What is activity view state?
Activity view data –
the state of all Views in the Activity’s layout
. 2. Activity non-view data – Activity instance variables. 3. Persistent data – data associated with multiple uses of the Activity separated by.
What should be done in order to preserve the state of an activity?
- pressing the back button.
- swiping the activity off of the Overview (Recents) screen.
- navigating up from the activity.
- killing the app from Settings screen.
- completing some sort of “finishing” action (which is backed by Activity. finish())
What is the difference between onCreate and onStart activity?
onCreate() is
called when the when the activity is first created
. onStart() is called when the activity is becoming visible to the user.
What is an activity?
An activity
provides the window in which the app draws its UI
. This window typically fills the screen, but may be smaller than the screen and float on top of other windows. … Typically, one activity in an app is specified as the main activity, which is the first screen to appear when the user launches the app.
In which state the activity is if it is not in focus but still visible on the screen?
3)
Paused State
:
When an activity is not in focus (i.e. not interacting with the user), but is still visible on the screen, it is in the paused state.
When you open the app it will go through the states of activity life cycle?
When opening the application, we can see one Window(Activity). onCreate (created) -> onStart(started) -> onResume(resume state) will be called. when closing the application from the background, activity has to be destroyed to free up some memory. So, onPause -> onStop -> onDestroy methods will be called.
When onPause of activity lifecycle is called?
‘onPause’ is called
when partially invisible
. A new, semi-transparent activity (such as a dialog) opens. As long as the activity is still partially visible but not in focus, it remains paused. So I have thought that if a dialog is opened, then the activity is paused.
When activity is moved to stopped state then what will happen to the life cycle of a fragment which is in that activity?
fragment will be
destroyed and recreated when activity reaches onResume again
.
Which stage of the lifecycle service value is seen?
Value of ITIL Service Operation
In the ITIL service lifecycle, each stage adds some value to the business involved. Service Strategy, Service Design, and Service Transition play a major role in providing value to a service, but it is only in
the Service Operations stage
that the actual value imparted is visible.
What is the first callback method during activity lifecycle in Android?
| Sr.No Callback & Description | 1 onCreate() This is the first callback and called when the activity is first created. | 2 onStart() This callback is called when the activity becomes visible to the user. | 3 onResume() This is called when the user starts interacting with the application. |
|---|
Which of the following is not the feature of service?
marketability
is the answer.
What method is called in an activity when it is destroyed?
Finally, the activity is destroyed.
As the activity moves from running to destroyed, the
onPause() and onStop() methods
get called before the activity is destroyed.
What is activity lifecycle What is the significant role of each state?
| Method Description | onStart called when activity is becoming visible to the user. |
|---|
When an activity is in the partially visible state?
to be partially visible is like for
situation
like poping a dialog themed Activity up over your Activity means that the activity is visible for user even it lost interaction with user.
Which function is used to restore activity state?
Restoring activity instance state
The
onCreate() callback method
, which is called with the instance state bundle when the activity is created. The onRestoreInstanceState() callback, which is called after onStart() after the activity is created.
What is saved instance state?
The savedInstanceState is
a reference to a Bundle object that is passed into the onCreate method of every Android Activity
. Activities have the ability, under special circumstances, to restore themselves to a previous state using the data stored in this bundle.
How do you save state on onPause?
Before your app is suspended, the onSaveInstanceState() method of your Activity will be fired, followed by onPause() . You should
place code in onSaveInstanceState()
that saves any UI state that you don’t want to lose. Other data, that does not relate to UI state, should be saved in onPause() .
What is tag in log?
The TAG has a
prefix of CCC (a short, easy to type string)
so that it is easy to list only your logs in android monitor in Android Studio. Sometimes you are running services or other classes simultaneously.
How can you persist the state information during changes in configuration?
If you want to persist the state of an activity so that it can be restored later, when the activity is recreated (when the device changes orientation), a much simpler way is to
implement the onSaveInstance() method
, as it provides a Bundle object as an argument so that you can use it to save your activity’s state.
What happens when we change the orientation of an activity?
When you rotate your device and the screen changes orientation,
Android usually destroys your application’s existing Activities and Fragments and recreates them
. Android does this so that your application can reload resources based on the new configuration.
What is difference between onCreate and onStart Mcq?
onCreate() is
called when the Activity is created
; that is, it is launched or started. (Additionally, this triggers when the orientation is changed.) It is called again when the process is killed, then returned to. while onStart() called following onCreate() at startup.
What is the difference between onPause and onStop?
onPause() is called
when an activity is about to lose focus
. onStop() is called when the activity is has already lost the focus and it is no longer in the screen. But onPause() is called when the activity is still in the screen, once the method execution is completed then the activity loses focus.
What are bundles in Android?
Android Bundles are generally
used for passing data from one activity to another
. Basically here concept of key-value pair is used where the data that one wants to pass is the value of the map, which can be later retrieved by using the key.
Is it possible activity without UI in Android?
Explanation. Generally, every activity is having its UI(Layout). But
if a developer wants to create an activity without UI
, he can do it.
What is Android application life cycle?
The Three Lives of Android
The
Entire Lifetime
: the period between the first call to onCreate() to a single final call to onDestroy(). … The Foreground Lifetime: The period between a call to onResume() until a corresponding call to onPause().
What are examples of activities?
The definition of activity is something that you do or something that is going on.
Going to the movies is
an example of an activity. A parade is an example of activity. A room where a lot of people are moving about is an example of a room alive with activity.
What are activities in school?
Popular activities include
sports, scouts, art, theater, music, and community service
. Many children also join school-affiliated organizations like student council, competitive academic clubs (like Model U.N. or math club), and affinity groups that help connect kids with shared identities.
What are the example of physical activities?
- Going for a walk, bike, or run (join our indoor walking program).
- Doing household chores.
- Taking the stairs instead of the elevator.
- Playing at the park.
- Raking leaves or shovelling snow.
What is the state of activity when it is in the foreground and the user can interact with it?
The main state of an activity is when it’s
running
or active. An activity is running when it’s in the foreground of the screen, has the focus, and the user can interact with it.
Is onResume always called?
onResume()
will always be called when the activity goes into foreground
, but it will never be executed before onCreate() .
How many time can a method be called?
Infinitely
. Not really until you don’t overflow the stack with function calls. Since each time a function is called all the variables used need space to be store in stack and stack is of limited size so someway in middle of any hundredth or thousandth call you will run out stack for function call.
Which of the following is not a state in the service lifecycle?
| Q. Which of the following is NOT a state in the lifecycle of a service? | B. running | C. destroyed | D. paused | Answer» d. paused |
|---|
Which is not state of an activity?
| State Description | Stopped Activity is not visible, instance is running but might be killed by the system. | Killed Activity has been terminated by the system of by a call to its finish() method. |
|---|
Which activity state is attained when a new activity is started on top of the current activity?
When a new Activity is started on top of the current one or when a user hits the Home key, the
activity is brought to Stopped state
. The activity in this state is invisible, but it is not destroyed.
