What is a state in Android?
State in an app is any value that can change over time. This is a very broad definition and encompasses everything from a Room database to a variable on a class. All Android apps display state to the user. A few examples of state in Android apps: A Snackbar that shows when a network connection can’t be established.
What is saving state in Android?
SavedStateProvider , which defines a single method called saveState() . The saveState() method allows your component to return a Bundle containing any state that should be saved from that component. SavedStateRegistry calls this method during the saving state phase of the UI controller’s lifecycle.
When should I call onSaveInstanceState?
Note that onSaveInstanceState() is called when your activity goes into the background and NOT when the app process is about to be killed.
What is the life cycle of Android activity?
An Android activity goes through six major lifecycle stages or callbacks. These are: onCreate() , onStart() , onResume() , onPause() , onStop() , and onDestroy() . The system invokes each of these callbacks as an activity enters a new state.
What do you know about state?
The state is a form of human association distinguished from other social groups by its purpose, the establishment of order and security; its methods, the laws and their enforcement; its territory, the area of jurisdiction or geographic boundaries; and finally by its sovereignty.
What are the states of an activity?
Hence, all in all there are four states of an Activity(App) in Android namely, Active , Paused , Stopped and Destroyed .
What are the intents in Android?
An intent is to perform an action on the screen. It is mostly used to start activity, send broadcast receiver,start services and send message between two activities. There are two intents available in android as Implicit Intents and Explicit Intents. Here is a sample example to start new activity with old activity.
What does addToBackStack null do?
Use . addToBackStack(“fragName”) : if you want later popToBackStack(String name, int flags) to pop more than one back stack. Use . addToBackStack(null) : If you don’t want later pop more than one back stack, but still want to pop one at a time.
What is an android activity?
An Android activity is one screen of the Android app’s user interface. In that way an Android activity is very similar to windows in a desktop application. An Android app may contain one or more activities, meaning one or more screens.
What are the types of intent in android?
There are two types of intents in android:
- Implicit and.
What are the four essential states of an activity in Android?
What is an Android activity?