performance - android : play short sound with short evoluting period using SoundPool -


i want implement sort of radar can find on cars parking. on service correctly connected activity binder, start thread must repeat short sound.wav (110ms long) short period change. code, @ beginning first loop plays sound has difficulties , lose rythm. worst, service never stop. garbage collector saturated. didn't find way realise this. thx

        public class mainservice extends service implements onloadcompletelistener{             private boolean soundradarloaded;             private soundpool spoolradar;             private int soundradarid;             private thread timerthread;             private boolean timerthreadrunning;              public int onstartcommand(intent intent, int flags, int startid) {                  soundradarloaded=false;                 spoolradar = new soundpool(10, audiomanager.stream_music, 0);                 soundradarid = spoolradar.load(this, r.raw.beepradar1, 1);                 spoolradar.setonloadcompletelistener(this);                 timerthreadrunning=true;                 timerthread=new thread(new runnable() {                 @override                 public void run() {                       int counter=0;                     long offset=system.currenttimemillis();                     while(timerthreadrunning) {                         // traitement                         longtime=system.currenttimemillis()-offset;                         if(soundradarloaded && longtime%400==0){//play every 400ms                             spoolradar.play(soundradarid, 1, 1, 1, 0, 1f);                         }                         try {                            thread.sleep(1);                         } catch (interruptedexception ex) {                         }                     }                      }             });              timerthread.start();         }      @override     public void onloadcomplete(soundpool arg0, int arg1, int arg2) {                  if(arg0==spoolradar)                     soundradarloaded=true;      }     @override     public void onstop() {         timerthreadrunning=false;         try{                 thread.sleep(1);               }catch (interruptedexception ex) {                         }         spoolradar.release(soundradarid);         }  }

precision of thread.sleep() isn't guaranteed. if thread.sleep(1) ignored line

if(soundradarloaded && longtime%400==0){//play every 400ms

may executed multiple times during same millisecond , multiple audio streams played @ same time (or @ undesired time later). second problem timerthread running , using cpu (and battery) time.

look @ https://developer.android.com/reference/java/util/timer.html or maybe https://developer.android.com/reference/java/util/concurrent/scheduledthreadpoolexecutor.html better solution.


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