Get the background color of a button in android
android:tag="#ff0000"

String colorCode = (String)btn.getTag();

Button button = (Button) findViewById(R.id.my_button);
Drawable buttonBackground = button.getBackground();

ColorDrawable buttonColor = (ColorDrawable) button.getBackground();

int colorId = buttonColor.getColor();

if (colorID == R.color.green) {
  log("color is green");
}

public Drawable getBackground();

public int getColor()