Скачать или смотреть Android AsyncTask

AsyncTask :
A thread is an independent path of execution in a running program. When an Android program is launched, the Android Runtime system creates a thread called the "Main" thread. As your program runs, each line of code is executed in a serial fashion, line by line. This main thread is how your application interacts with components from the Android UI Toolkit, and it's why the main thread is sometimes called the "UI thread". However, sometimes an application needs to perform resource intensive work, such as downloading files, database queries, playing media, or computing complex analytics. This type of intensive work can block the UI thread if all of the code executes serially on a single thread. When the app is performing resources intensive work, the app does not respond to the user or draw on the screen because it is waiting for that work to be done. This can yield poor performance, which negatively affects the user experience. Users may get frustrated and uninstall your Android app if the performance of the app is slow.
To keep the user experience (UX) running smoothly and responding quickly to user gestures, the Android Framework provides a helper class called AsyncTask which processes work off of the UI thread. An AsyncTask is an abstract Java class that provides one way to move this intensive processing onto a separate thread, thereby allowing the UI thread to remain very responsive.

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