前序 单实例Singleton设计模式可能是被讨论和使用的最广泛的一个设计模式了，这可能也是面试中问得最多的一个设计模式了。这个设计模式主要目

Context is probably the most used element in Android applications…it may also be the most misused.Context objects are so common, and get passed around so frequently, it can be easy to create a situation you didn’t intend. Loading resources, launching a new Activity, obtaining a system service, getting internal file paths, and creating views all require a Context (and that’s not even getting started on the full list!) to accomplish the task.

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