why android cant download a file in main activity ?

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i want to know why android cant download a file in main Activity . i read a lot of articles and they all said you cant do a long time operations in main activity BUT They dont have any useful explanation !
i want a Scientific reason .

Posted 25-Dec-14 10:17am

seyed mahmud shahrokni

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Sergey Alexandrovich Kryukov 25-Dec-14 16:39pm

Just my guess: isn't that because event-oriented UI is executed by the main activity, so any other lengthy operations would block the UI? I personally would always advise using a separate thread for network communications (and many other things), but no wonder if some library enforce that. Doesn't it make sense?
—SA

Afzaal Ahmad Zeeshan 25-Dec-14 17:22pm

Instead of these opinion based questions. It is better to ask real questions that you've encountered. What error did you get?

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