Save Changes In Activity Onpause()

am having an activity which has a recycler view that displays data fetched from database , it displays products to add in cart so user sets the quantity of the product . all good h

Solution 1:

Yes its good idea to avoid losing data or state.

1. Save Instance state by Implementing onSaveInstanceState Method.

   @Override 
    protected void onSaveInstanceState(@NonNull Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString("productName",productText.getText().toString());
    outState.putInt("quantity", Integer.parseInt(quantityText.getText().toString())); 
   }
   

2. Restore in onCreate.

   if (savedInstanceState != null) {
        productText.setText(savedInstanceState.getString("productName"));
        quantityText.setText(String.valueOf(savedInstanceState.getInt("quantity")));
   
    }
   

Solution 2:

Instead of using SharedPreferecnes, use the ViewModel class that specific purpose is to store and manage UI-related data in a lifecycle-conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations. https://developer.android.com/topic/libraries/architecture/viewmodel