android - How to change spinner background image? -

hi new android,i using spinner background image. spinner contains 4 values, , each 1 has images.if click spinner values, images changed in spinner background. please me how can change background image when spinner value changed?

give id parent (linear or relative) layout of main.xml file , in java file,if 4 values of spinner mercury,venus,earth,mars, in onselected itemlistener,put code this

public void onitemselected(adapterview<?> parent, view view, int pos, long id) {       toast.maketext(parent.getcontext(), "the planet " +           parent.getitematposition(pos).tostring(), toast.length_long).show();       if(parent.getitematposition(pos).tostring().equalsignorecase("mercury"))       {           ll1.setbackgroundresource(r.drawable.java_j2me);       }       if(parent.getitematposition(pos).tostring().equalsignorecase("venus"))       {           ll1.setbackgroundresource(r.drawable.image);       }       if(parent.getitematposition(pos).tostring().equalsignorecase("earth"))       {           ll1.setbackgroundresource(r.drawable.javaandroid);       }       if(parent.getitematposition(pos).tostring().equalsignorecase("mars"))       {           ll1.setbackgroundresource(r.drawable.party);       } }