Cores randomicas em 5 lineares

Button changeColorsButton = findViewById(R.id.change_colors_button);
final LinearLayout linear1 = findViewById(R.id.linear1);
final LinearLayout linear2 = findViewById(R.id.linear2);
final LinearLayout linear3 = findViewById(R.id.linear3);
final LinearLayout linear4 = findViewById(R.id.linear4);
final LinearLayout linear5 = findViewById(R.id.linear5);
final Random random = new Random();

changeColorsButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        linear1.setBackgroundColor(random.nextInt(2) == 0 ? Color.RED : Color.BLUE);
        linear2.setBackgroundColor(random.nextInt(2) == 0 ? Color.RED : Color.BLUE);
        linear3.setBackgroundColor(random.nextInt(2) == 0 ? Color.RED : Color.BLUE);
        linear4.setBackgroundColor(random.nextInt(2) == 0 ? Color.RED : Color.BLUE);
        linear5.setBackgroundColor(random.nextInt(2) == 0 ? Color.RED : Color.BLUE);
    }
});