Multi-threading 。Put non-Ul work on a Android App separate thread UI For example,download an Main Thread image,connect to a remote server,open a web browser... Java Threads BG BG BG Background Thread 9 Multi-threading • Put non-UI work on a separate thread • For example, download an image, connect to a remote server, open a web browser… 9 UI Android App Java Threads BG BG BG Main Thread Background Thread