java - What is the best way to wait until a runnable on the main thread completes in Android? -


i need collect username , password user inside webviewclient#shouldinterceptrequest, must block webview io thread until user supplies username , password on main thread. best way wait until runnable completes?

my current favorite way (exceptions , timeouts omitted brevity):

final countdownlatch countdownlatch = new countdownlatch(1); new handler(looper.getmainlooper()).post(new runnable() {   public void run() {     callsomethingwithasynccallback(new runnable() {       public void run() {         countdownlatch.countdown();       }     });   } }); countdownlatch.await();

something uses executorservices seems better since can use future#get block. however, there no executorservice runs on main thread, , using 1 executors bounce main thread seems wasteful. thoughts?

please use asynctask rather using runnable.

  • the asynctask executes in doinbackground() inside of thread, not have access gui views are.
  • preexecute() , postexecute() offer access gui before , after heavy lifting occurs in new thread, can pass result of long operation postexecute() show results of processing.

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