button color dont changing in android studio code example

Example 1: android studio change button color programmatically

// If you're in an activity:
Button11.setBackgroundColor(getResources().getColor(R.color.red));
// OR, if you're not: 
Button11.setBackgroundColor(Button11.getContext().getResources().getColor(R.color.red));

Example 2: android studio change button color programmatically

Button11.setBackgroundColor(0xFFFF0000); // 0xAARRGGBB