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Why handlers/AsyncTask are used?

gauravkv gupta
Greenhorn

Joined: Feb 18, 2012
Posts: 21
I am new to Android technology, and after going through various post and blogs i understand the "What is handler/AsyncTask and how it is used" but i could not understand the fact that what we lose if we omit the Handlers and AsyncTasks from Android. So, i want to know "Why handlers are used and what problem handlers solve".

Please spare your valueable time and help me out in this.

Thanks in appreciation.
Deepak Bala
Bartender

Joined: Feb 24, 2006
Posts: 6662
    
    5

You cannot perform long running tasks on the UI thread on Android. Doing so will make the OS want to kill your app quickly. The OS usually waits for ~X seconds before waiting for your UI thread to return. To avoid being zapped by android, you can use a AsyncTask / Service to perform long running operations.

Here is a great video that explains async operations



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subject: Why handlers/AsyncTask are used?