1. add camera button drawables 2. remote some useless code
fix crash :
reference solution:

PagerAdapter对于notifyDataSetChanged()和getCount()的执行顺序是非常严格的，系统跟踪count的值，如果这个值和getCount返回的值不一致，就会抛出这个异常。所以为了保证getCount总是返回一个正确的值，那么在初始化ViewPager时，应先给Adapter初始化内容后再将该adapter传给ViewPager，如果不这样处理，在更新adapter的内容后，应该调用一下adapter的notifyDataSetChanged方法。

java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 0, found: 1 Pager id: com.art.tech:id/pager Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.art.tech.fragment.ImagePagerFragment$ImageAdapter
1. make edit button click has animation 2. can delete current image in pager view
add user profile page