Calling a function from another class? Android -

store activity:

  public void unlockcup2(){      } 

main activity:

public void unlock2(){     x = (x-100);      imageview img5 = (imageview) findviewbyid(r.id.bluecake);     img5.setvisibility(view.visible); } 

soo, want make when button in store activity(witch calls unlockcup2()) call unlock2 in mainactivity . how do this?

localbroadcastmanager can job. send broadcast in storeactivity , receive in mainactivity , call unlock2()

mainactivity (receiver)

    private broadcastreceiver mreceiver = new broadcastreceiver() {         @override         public void onreceive(context context, intent intent) {             // in case, there's 1 type of action, no need check action             unlock2();         }     };      @override     public void oncreate(bundle savedinstancestate) {         ...         localbroadcastmanager.getinstance(this).registerreceiver(mreceiver,                 new intentfilter("custom-action-name"));     }      @override     protected void ondestroy() {         ...         localbroadcastmanager.getinstance(this).unregisterreceiver(mreceiver);     } 

storeactivity (sender)

    public void unlockcup2() {         ...         localbroadcastmanager.getinstance(this)                 .sendbroadcast(new intent("custom-action-name"));     }