android - How to update Map via Handler? -


i updating map asynctask. want same handler. looked around couldn't understand should do. asynctask kinda slow , want bit fast.

here doing in asynctask:

    class drawroutetask extends asynctask<geopoint, void, polyline> {      private exception exception;     private polyline roadoverlay;      @override     protected void onpostexecute(polyline polyline) {         super.onpostexecute(polyline);         log.i("asynctask ", " in post execute " + roadoverlay);         roadoverlay = roadoverlay;          // mosmv.invalidate();          mosmv.getoverlays().add(roadoverlay);         mosmv.invalidate();     }      @override     protected polyline doinbackground(geopoint... geopoints) {         try {             log.i("asynctask", "start point >> " + geopoints[0]);             log.i("asynctask", "end point >> " + geopoints[1]);              roadmanager roadmanager = new osrmroadmanager(getcontext());              arraylist<geopoint> waypoints = new arraylist<>();             waypoints.add(geopoints[0]);             waypoints.add(geopoints[1]);               marker marker =  new marker(mosmv);             marker.setposition(geopoints[0]);             marker.setposition(geopoints[1]);              marker.settitle("your location ");             log.i("asynctask ", "drawable >> "+ contextcompat.getdrawable(getcontext(), r.drawable.pin));             marker.seticon(contextcompat.getdrawable(getcontext(), r.drawable.pin));               mosmv.getoverlays().add(marker);              road = roadmanager.getroad(waypoints);              roadoverlay = roadmanager.buildroadoverlay(road);             roadoverlay.setcolor(color.red);               return roadoverlay;           } catch (exception e) {             e.printstacktrace();         }          return null;      } }

any appreciated.

you mean thread , handler?

do whatever inside doinbackground() function inside thread , send via handler main thread.

your code should this.

    new thread(new runnable(){           public void run(){                 // doinbackground() codes..                 message msg = handler.obtainmessage(what);//what refers field inside message;                 msg.obj = want put;                 msg.sendtotarget(); //dispatches msg handler.           }      }).start();  private handler handler = new handler(){   public void handlemessage(message msg){      //handles message dispatched above code.       int = msg.what; //you can use 'what' switch-case case.      someobject data = (someobject) msg.obj; //   }  }

note thread's run() or asynctask's doinbackground not ui thread, means changing ui inside these methods cause crashes. but, handlermessage() or onpostexecute() methods performed inside main thread, can use update view.


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