Android – view.setbackground throws nosuchmethoderror

See English answer > setbackground vs setbackgrounddrawable (Android) 12 following codes:

View inflate = inflater.inflate(R.layout.page, null);
Drawable img = getResources().getDrawable((Integer) (item.get("img")));
inflate.findViewById(R.id.page_img).setBackground(img);

The following error occurred:

java.lang.NoSuchMethodError：android.view.View.setBackground

I don't know why. I've tried setbackground with r.drawable.img, but I got the same error

resolvent:

This method was introduced in API level 16, and you are likely to run on an earlier version:

http://developer.android.com/reference/android/view/View.html#setBackground (android.graphics.drawable.Drawable)

Use setbackgrounddrawable()