android - running multiple AsyncTasks: task.executeOnExecutor not working -


i have college project need use threads run tasks in paralel. started using asynctask , simple task.execute(params), found out not allow multiple asynctasks run, 1 per time. discovered task.executeonexecutor, use this(code inside elevatorcontrol class):

taskdesligalampada.executeonexecutor(asynctask.thread_pool_executor, "");

i execute in elevatorcontrol class(which not activity). funny thing is: executeonexecutor not starting doinbackground method of task. tried using logging debuggig this(inside asynctask):

@override protected string doinbackground(string... string_qualquer)  {     //parei aki parece que essa task nÃo executa. problema execute on executor?     log.i("elevatorcontrol", "elevador id=" + elevatorcontrol.getidelevador() + ";fechando porta");     this.interfacedaporta.fecharporta(andaratual, this.elevatorcontrol.getidelevador());     return ""; }

but log not appear on logcat, means it's not running. tried catching state variable returned after executteonexecutor this(method inside elevatorcontrol task):

//os eventos abaixo deveriam ser concorrentes. por isso tasks foram criadas     taskfechaporta taskfechaporta = new taskfechaporta(this, interfacedaporta, sobeoudesceouparado, andaratual);     status statusthreadroda = taskfechaporta.executeonexecutor(asynctask.thread_pool_executor, "").getstatus();

and, debugging, found out status "running". why not running doinbackground method of task?

can me doing wrong?

p.s.: use lot of asynctasks project, @ least 18 running because teacher said so.

first of all, android has limit of threads , asynctask. "all asynctasks controlled internally shared (static) threadpoolexecutor , linkedblockingqueue. when call execute on asynctask, threadpoolexecutor execute when ready time in future."

in post:android asynctask threads limits?

what version of android? feature available since honeycomb.

regards.


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