保存活动状态 Android studio

Question

How could i save the activity state and values after closing application and when i open it again it have the values of radio button and spinner and edit text

in android studio in kotlin or in java

Answer 1

You could save your data in SQLite database before closing your application and then retrieving again when the activity is started. Checkout this guide on how to use Room to save data. I also recommend you to read about other types of storage in this guide

Answer 2

You could use SharedPreferences.

SharedPreferences can be used as some sort of cache/cookie which will be useful when the user's detail/action is to be remembered when he comes back to use the application.

Android provides many ways of storing data of an application. One of this way is called Shared Preferences. Shared Preferences allow you to save and retrieve data in the form of key,value pair.