Android 里常用的一个设计是点击两次Back键退出应用或Activity功能，避免误操作。 这种设计很贴心，实现也比较简单。 (read more...)

• Viewholder模式在Adapter中有广泛的应用， 一般的写法是在Adapter类中写一个静态内部类，
• 里面包含几个静态成员变量。这里介绍的写法很酷。 但是执行效果跟普通做法基本一致。本类中用到了
• 效率比较高的集合类SparseArray.也是Android里 推荐用它类替换HashMap<Integer,Object>。 (read more...)

You’ve most likely heard of the MVC (Model-View-Controller) pattern, and you’ve probably used it in different frameworks. When I was trying to find a better way to test my Android code, I learned about the MVP (Model-View-Presenter) pattern. The basic difference between MVP and MVC is that in MVP, the presenter contains the UI business logic for the view and communicates with it through an interface. In this hack, I’ll show you how to use MVP inside Android and how it improves the testability of the code. To see how it works, we’ll build a splash screen. A splash screen is a common place to put initialization code and verifications, before the application starts running. In this case, inside the splash screen we’ll provide a progress bar while we’re checking whether or not we have internet access. If we do, we continue to another activity, but if we don’t, we’ll show the user an error mes- sage to prevent them from moving forward. (read more...)