How do I use onSaveInstanceState?
The onSaveInstanceState() method allows you to add key/value pairs to the outState of the app. Then the onRestoreInstanceState() method will allow you to retrieve the value and set it back to the variable from which it was originally collected.
How do I use savedInstanceState on Android?
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.
What is Save instance state in Android?
The savedInstanceState is only for saving state associated with a current instance of an Activity, for example current navigation or selection info, so that if Android destroys and recreates an Activity, it can come back as it was before. See the documentation for onCreate and onSaveInstanceState.
What is onSaveInstanceState?
Save simple, lightweight UI state using onSaveInstanceState() As your activity begins to stop, the system calls the onSaveInstanceState() method so your activity can save state information to an instance state bundle.
What is use of onSaveInstanceState in Android?
onSaveInstanceState method gets called typically before/after onStop() is called. This varies from Android version to version. In the older versions it used to get before onStop() . Inside this method, we save the important values in the Bundle in the form of key value pairs.
What is a fragment in Android?
A Fragment represents a reusable portion of your app’s UI. A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. Fragments cannot live on their own–they must be hosted by an activity or another fragment.
What is the use of setContentView in Android?
SetContentView is used to fill the window with the UI provided from layout file incase of setContentView(R. layout. somae_file). Here layoutfile is inflated to view and added to the Activity context(Window).
What is onCreate method in Android?
onCreate is used to start an activity. super is used to call the parent class constructor. setContentView is used to set the xml.
What is process death in Android?
Your Android application (process) can be killed at any time if it’s in paused or stopped state . … The state of your Activities, Fragments and Views will be saved.
What is the bundle in Android?
An Android App Bundle is a publishing format that includes all your app’s compiled code and resources, and defers APK generation and signing to Google Play. … You no longer have to build, sign, and manage multiple APKs to optimize support for different devices, and users get smaller, more-optimized downloads.
What is intent class in Android?
An Intent is a messaging object which provides a facility for performing late runtime binding between the code in different applications in the Android development environment.
What is a ViewModel Android?
The android. ViewModel is a class that is responsible for preparing and managing the data for an Activity or a Fragment . … It also handles the communication of the Activity / Fragment with the rest of the application (e.g. calling the business logic classes).
Is onSaveInstanceState always called?
onSaveInstanceState() gets called regardless of whether or not your app process is killed.
Is OnRestoreInstanceState called after onCreate?
OnRestoreInstanceState(Bundle)
This method is called after OnStart() when the activity is being re-initialized from a previously saved state, given here in savedInstanceState .
What does Super onCreate do?
By calling super. onCreate(savedInstanceState); , you tell the Dalvik VM to run your code in addition to the existing code in the onCreate() of the parent class. The code in the framework classes handles stuff like UI drawing, house cleaning and maintaining the Activity and application lifecycles.