Android Save chosen item from Context Menu -


hi struggling witch menu context after chose item setting new background color how save it??? idea save doesn't work :(

public class mainactivity extends appcompatactivity {

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      button btn2 = (button)findviewbyid(r.id.btn2);      linearlayout mainscreen = (linearlayout) findviewbyid(r.id.mainscreen);      this.registerforcontextmenu(btn2);      sharedpreferences settings = getsharedpreferences("mypref", 0);     if(settings!=null){         //do nothing     }else if(settings.getstring("color", "red").equals("red")){         mainscreen.setbackgroundcolor(color.red);     }else if(settings.getstring("color", "blue").equals("blue")){         mainscreen.setbackgroundcolor(color.blue);     }else if(settings.getstring("color", "green").equals("green")){         mainscreen.setbackgroundcolor(color.green);     }else if(settings.getint("color", 1)==1){         mainscreen.setbackgroundresource(r.drawable.tlodelikatne);     }else if(settings.getint("color", 2)==2){         mainscreen.setbackgroundresource(r.drawable.tlodelikatne);     } }  public void onhelp(view v) {     opencontextmenu(v); }  @override public void oncreatecontextmenu(contextmenu menu, view v, contextmenu.contextmenuinfo menuinfo){     if(v.getid()==r.id.btn2){         this.getmenuinflater().inflate(r.menu.settings_menu, menu);      }     super.oncreatecontextmenu(menu, v ,menuinfo); }  @override public boolean oncontextitemselected(menuitem item) {     int selecteditemid = item.getitemid();     linearlayout mainscreen = (linearlayout) findviewbyid(r.id.mainscreen);      sharedpreferences settings = getsharedpreferences("mypref", 0);     sharedpreferences.editor editor = settings.edit();      editor.commit();     switch (selecteditemid) {         case r.id.minired:             mainscreen.setbackgroundcolor(color.red);             editor.putstring("color", "red");             break;         case r.id.miniblue:             mainscreen.setbackgroundcolor(color.blue);             editor.putstring("color", "blue");             break;         case r.id.minigreen:             mainscreen.setbackgroundcolor(color.green);             editor.putstring("color","green");             break;         case r.id.light:             mainscreen.setbackgroundresource(r.drawable.backgroundone);             editor.putint("color",1);             break;         case r.id.blue:             mainscreen.setbackgroundresource(r.drawable.backgroundtwo);             editor.putint("color",2);             break;      }     editor.commit();     return super.oncontextitemselected(item); }

}


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