TextInputLayout Error right align

So thanks to Mike's answer I was able to figure out the solution.

I created a custom class:

public class CustomTextInputLayout extends TextInputLayout {

    public CustomTextInputLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setErrorEnabled(boolean enabled) {
        super.setErrorEnabled(enabled);

        if (!enabled) {
            return;
        }

        try {
            Field errorViewField = TextInputLayout.class.getDeclaredField("mErrorView");
            errorViewField.setAccessible(true);
            TextView errorView = (TextView) errorViewField.get(this);
            if (errorView != null) {
                errorView.setGravity(Gravity.RIGHT);
                LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
                params.gravity = Gravity.END;
                errorView.setLayoutParams(params);
            }
        }
        catch (Exception e) {
            // At least log what went wrong
            e.printStackTrace();
        }
    }
}

Now I simply replaced my TextInputLayout with the CustomTextInputLayout. Works like a charm. Thanks a lot Mike. I wish I could credit you more for this answer.

Here's a hack in Kotlin that doesn't depend on view hierarchy:

class CustomTextInputLayout @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : TextInputLayout(context, attrs, defStyleAttr) {

    override fun setError(errorText: CharSequence?) {
        super.setError(errorText)
        with(findViewById<TextView>(R.id.textinput_error)) {
            // this will work as long as errorView's layout width is
            // MATCH_PARENT -- it is, at least now in material:1.2.0-alpha06
            textAlignment = TextView.TEXT_ALIGNMENT_VIEW_END
        }
    }
}