java - Run a function synchronously in another thread -

how can run function synchronously in thread, meaning main ui thread has function calls function work on thread, waits new thread finish , returns value:

int mainfunction() //this function on main ui thread {    return doworkonnewthread(); }  int doworkonnewthread() {    //do work on new thread } 

you can use async task this, though it's asynchronous. can use callbacks onpostexecute , onprogressupdate update values needed. should note don't want synchronized block ui thread cause application not responding alert depending on how long calculation takes.