android - How can I jump from a Handler started from a service to the service's thread? -

i use handler in service class background work, when it's done, must execute code on service's thread. here's code:

i create handler in service's oncreate method.

    handlerthread handlerthread = new handlerthread(getpackagename());     handlerthread.start();     looper looper = handlerthread.getlooper();     mhandler = new handler(looper); 

how use handler. method getting called dozens of times during session.

    mhandler.post(new runnable() {         @override         public void run() {               // takes few seconds execute method,                // must running on separate thread.               object o = supermethod();                // however, must called service's thread.               useobject(o);         }     };) 

so how can service's thread?

service runs on main thread here want switch handler thread(background thread) service(main thread).

handler handler = new handler(getmainlooper());         handler .post(new runnable() {             @override             public void run() {                 // main thread task here             }         });