(It took a long time to get the source code of the page turning function of the book. Download it and have a look. This material includes the following attachments:
Book\bin\com\xin\book\view\BookAdapter.class
Book\bin\com\xin\book\view\BookLayout$1.class
Book\bin\com\xin\book\view\BookLayout$2.class
Book\bin\com\xin\book\view\BookLayout$3.class
Book\bin\com\xin\book\view\BookLayout$BookOnGestureListener.class
Book\bin\com\xin\book\view\BookLayout$BookView.class
Book\bin\com\xin\book\view\BookLayout$DrawThread.class
Book\bin\com\xin\book\view\BookLayout$WhiteView.class
Book\bin\com\xin\book\view\BookLayout.class
Book\bin\com\xin\book\view\BookState.class
Book\bin\com\xin\book\view\Corner.class
Book\bin\com\xin\book\view\IAdapter.class
Book\bin\com\xin\book\view\IBook.class
Book\bin\com\xin\book\view\IListener.class
Book\bin\com\xin\book\MainActivity.class
Book\bin\com\xin\book\R$attr.class
Book\bin\com\xin\book\R$drawable.class
Book\bin\com\xin\book\R$layout.class
Book\bin\com\xin\book\R$string.class
Book\bin\com\xin\book\R.class
Book\bin\Book.apk
Book\bin\classes.dex
Book\bin\resources.ap_
Book\gen\com\xin\book\R.java
Book\res\drawable-hdpi\icon.png
Book\res\drawable-ldpi\icon.png
Book\res\drawable-ldpi\ly.xml
Book\res\drawable-mdpi\icon.png
Book\res\layout\main.xml
Book\res\values\strings.xml
.....)