(Android contacts the instance of event management operation, the source code of TouchScreen, and event contact are the basis of Android mobile phone operation. A good event contact mechanism can improve the operating experience of Android. This code demonstrates all aspects of Android's contact with things through a series of examples, such as judging whether to contact, Android making pictures, opening pictures to contact mobile things, touching and pressing things, obtaining the X and Y coordinates of clicks, etc. Although it is very specific, it is a basic skill.)