java - Android: How to Use Handlers With Thread Class and UI Thread (MainActivity) -


i viewed answer here: updating android ui using threads

but not able understand how instantiate handler in background thread match uithread.

i want clear , im using 2 entirely separate classes.

uithread handler code: 

      final handler handler = new handler(){       @override       public void handlemessage(message msg) {         if(msg.what==update_image){           images.get(msg.arg1).setimagebitmap((bitmap) msg.obj);         }         super.handlemessage(msg);       }     };

background thread handler code:

    if(dataarrives){         message msg = handler.obtainmessage();         msg.what = update_image;         msg.obj = bitmap;         msg.arg1 = index;         handler.sendmessage(msg);     }

in background class, im getting "handler" undefined. please show entire thread classes in answer if can.


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