下拉头部变化的 ScrollView Android 组件
Home Page: http://jiyiren.github.io/2015/08/13/android-scrollview/
项目结构
代码结构
Activity ,PullToZoomScrollView ( 即自定义的 ScrollView )，主布局
分为两块，一个为TopBar，即标题栏（这个不用说了），另外一个是自定义的ScrollView，即PullToZoomScrollView。既然是ScrollView,它也是ViewGroop，所以它内部也可以包含多个布局。
PullToZoomScrollView 布局
也包含两块，一个是上面要下拉可以变大的布局(即含背景图的布局)，一个就是下面的文字显示布局。我这里是分别写两个layout布局，在主布局里include进去的。
向上滑动时不是整体滑动，而是下面的item向上动。接下来才是整体滑动。如何才能让图片和item一起向上滑动
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