How would you preserve activity state during a screen rotation?
How would you preserve activity state during a screen rotation?
4 Answers
- Assuming you have 2 XML layout files for portrait and landscape, put your main.xml layout file in the following folders: res/layout/main.xml <– this will be your portrait layout.
- Now to save your text from the text view =) Lets assume your textview is named as MyTextView in your layout xml file.
What is saving state in Android?
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.
How do I manage changes to screen orientation?
If you want to manually handle orientation changes in your app you must declare the “orientation” , “screenSize” , and “screenLayout” values in the android:configChanges attributes. You can declare multiple configuration values in the attribute by separating them with a pipe | character.
How do you persist 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.
How do you change orientation when retaining data?
Another most common solution to dealing with orientation changes by setting the android:configChanges flag on your Activity in AndroidManifest. xml. Using this attribute your Activities won’t be recreated and all your views and data will still be there after orientation change.
What is UI state in Android?
The UI state is application data transformed by the ViewModel. The UI notifies the ViewModel of user events. The ViewModel handles the user actions and updates the state. The updated state is fed back to the UI to render.
What is super onCreate savedInstanceState in Android?
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. If you leave out this line, then only your code is run.
What happens when screen orientation changes in android?
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 happens when orientation changes android?
How do you prevent data from reloading and resetting when the screen is rotated?
Just add android:configChanges=”orientation|screenSize” in activity tab of manifest file. So, Activity won’t restart when orientation change.
