Java Async wait for finish

Question

Ho do i get my function to wait for being done with it's async task before returning the variable?

public boolean CheckOnline(){
    OnlineAsyncTask onlinetsk = new OnlineAsyncTask();
    onlinetsk.execute();
    return Online;
}

Then it should be not async. Execute it in a normal thread and call join() on the thread object, to wait until it finishes. Make sure you don't block the UI-thread. — Eng.Fouad
– Eng.Fouad, Commented Mar 12, 2015 at 11:15

laalto · Accepted Answer · 2015-03-12 11:15:51Z

2

You can call get() to wait for the async task to complete and retrieve the result.

However that defeats the purpose of an async task - it's no longer asynchronous. Consider redesigning your app so that you don't need to wait for a result. Instead e.g. use a callback interface to notify that the async task has finished and a result is available.

answered Mar 12, 2015 at 11:15

laalto

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Fahim · Accepted Answer · 2015-03-12 11:15:53Z

0

String str_result= new OnlineAsyncTask().execute().get();

This will make it wait till it returns the value

answered Mar 12, 2015 at 11:15

Fahim

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1 Comment

Anthony Over a year ago

Would this also then run on the main thread and not on a separate thread?

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