How to set TextInputLayout error message colour?

I needed to do this dynamically. Using reflection:

java

public static void setErrorTextColor(TextInputLayout textInputLayout, int color) {
  try {
    Field fErrorView = TextInputLayout.class.getDeclaredField("mErrorView");
    fErrorView.setAccessible(true);
    TextView mErrorView = (TextView) fErrorView.get(textInputLayout);
    Field fCurTextColor = TextView.class.getDeclaredField("mCurTextColor");
    fCurTextColor.setAccessible(true);
    fCurTextColor.set(mErrorView, color);
  } catch (Exception e) {
    e.printStackTrace();
  }
}

You will need to call textInputLayout.setErrorEnabled(true) before invoking the above method for this to work.