Android Studio Constant expression required

"Constant expression required" error in Android Studio usually occurs when you try to use a non-constant value in a place where a constant value is required.

To fix this error, you need to make sure that all the values that you use in the code are constants. For example, if you are defining an array size, you need to use a constant value instead of a variable.

Here is an example:

int size = 10;
int[] arr = new int[size]; // This will cause "Constant expression required" error

// To fix this error, you can define the array size as a constant value:
final int SIZE = 10;
int[] arr = new int[SIZE];

By defining the array size as a constant value, you can avoid the "Constant expression required" error in Android Studio.