Context字面意思上下文，位于framework package的android.content.Context中，

其實該類為LONG型，類似Win32中的Handle句柄，很多方法需要通過Context才能識別調用者的實例。

官方說明：

Interface to global information about an application environment.? This is an abstract class whose implementation is provided by the Android system.? It allows access to application-specific resources and classes, as well as up-calls for application-level operations such as launching activities, broadcasting and receiving intents, etc.

轉載于:https://www.cnblogs.com/YangBinChina/p/3198535.html

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