constant expression required when trying to create a switch case block

`an error keeps saying "constant expression required" preventing me from running the app on a device to further develop the app.

am trying to create a sort of google pay.. so i need the selected amounts. but am getting an error saying "constant expression required".. the variable is declared private and not final so i dont know why am getting this error. the value is not even highlighted showing that it is being used. how can i solve this error. i tried innitialising the variable to zero but it still does not help..
`

package com.example.greenearth;
import android.media.Image;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RelativeLayout;
import android.widget.Toast;
public class Donations extends Fragment {
RadioGroup radioGroup;
RadioButton minimum;
RadioButton average;
RadioButton maximum;
private int google_amount=0;
RelativeLayout rl;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_donations, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
radioGroup=view.findViewById(R.id.select);
minimum=view.findViewById(R.id.fifty);
average=view.findViewById(R.id.five_hundred);
maximum=view.findViewById(R.id.ten_thousand);
rl=view.findViewById(R.id.donater);
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId){
case R.id.fifty:
google_amount=50;
break;
case R.id.five_hundred:
google_amount=500;
break;
case R.id.ten_thousand:
google_amount=10000;
break;
}
}
});
rl.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (google_amount>0) {
//googlepay
} else {
Toast.makeText(getContext(),"Please choose an amount", Toast.LENGTH_SHORT).show();
}
}
});
}
}

Starting with Android Gradle Plugin 8.0.0, by default, your resources (e.g. R.id. ...) are no longer declared final (i.e. constant expressions) for optimized build speed, which is a prerequisite to be used in switch statements:
https://developer.android.com/build/optimize-your-build#use-non-constant-r-classes

If you want to keep the old behavior, you can add this line in the gradle.properties file:

android.nonFinalResIds=false

If you want to fix it by converting it to if/else statements, Android Studio will help you with

<kbd>Ctrl</kbd> + <kbd>1</kbd> or

<kbd>Alt</kbd> + <kbd>Enter</kbd>

on the switch keyword.

Put this line

android.nonFinalResIds=false

In this file and sync

gradle.properties

That's works for me

Replace your switch statement with if condition like below

 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (checkedId == R.id.fifty) {
google_amount = 50;
} else if (checkedId == R.id.five_hundred) {
google_amount = 500;
} else if (checkedId == R.id.ten_thousand) {
google_amount = 10000;
}
}
});

If you encounter the "constant expression required" error, ensure that the expression used in the switch statement is indeed a constant expression. If you need to evaluate a non-constant expression, you might consider using if-else statements instead.