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android中间件指的是什么

发布时间:2019-07-05 07:16 来源:未知 编辑:admin

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  2013-07-27展开全部android的虚拟机是Dalvik 。系统本身是完全开源的,但硬件厂商可以写闭源驱动。

  Android applications are written in the Java programming language. The compiled Java code — along with any data and resource files required by the application —many ways, each Android application lives in its own world:By default, every application runs in its own Linux process. Android starts the process when any of the applications code needs to be executed, and shuts down the process when its no longer needed and system resources are required by other applications.Each process has its own virtual machine (VM), so application code runs in isolation from the code of all other applications.By default, each application is assigned a unique Linux user ID. Permissions are set so that the applications files are visible only to that user and only to the application itself — although there are ways to export them to other applications as well.Its possible to arrange for two applications to share the same user ID, in which case they will be able to see each others files. To conserve system resources, applications with the same ID can also arrange to run in the same Linux process, sharing the same VM.

  中间件其实就是屏蔽硬件系统差异,并提供统一接口给各种应用程序,可供二次开发的一些组件,类库。 一般都是应用和系统之间的软件层,在android上就是类似应用程序框架之上应用程序之间的那种链接部分,由于是手机这样的嵌入式系统,硬件比较特殊,可能也涉及底层的驱动及库的支持,提供驱动+库支持+系统软件框架之上支持应用程序运行的软件开发。

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