Android 34 Advanced

 Public View GetView (int position, view Convertview, ViewGroup parent) {////Convertview is a cache, Each time a layout is returned to the system, the Android system is displayed according to the layout and dataof the layout,// This layout is also stored in the Convertview, The number of Convertview cache layout is the number of the list displayed on the screen,// But when the screen scrolls, the data that is removed from the screen is added to the newly displayed data, ensuring that only one screen is displayed at the same time. View layout=view.inflate (mainactivity.  thisnull);}

Android 34 Advanced