NoSuchMethodError setBackground兼容低版本

转自:http://gushedaoren.blog.163.com/blog/static/173663405201392443255888/

判断：

int sdk = android.os.Build.VERSION.SDK_INT;if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {    setBackgroundDrawable();} else {    setBackground();}

如：

Resources resources = getActivity().getResources(); 
Drawable btnDrawable = resources.getDrawable(drawableId); //R.drawable.selector_attention_shape_focus_bg

setBackground(btnDrawable);