(The stock uses the source code files related to Android mobile phone clients, which are compiled under the compilation environment. Although it is a stock client software, it can also be learned to write and implement other client software. General implementation idea: As my fingertip moves on the screen, I continuously output onScroll information. Finally, I use onScroll () and onFling(). When I scroll, I switch with the movement of my finger. When my finger is released, I use Fling to achieve inertial switching, which seems natural. Finally, I extract some code)