android升级ADT新建项目出现appcompat_v7

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升级到最新的开发工具后，发现新建项目出现一个名为appcompat_v7de 项目而且有红叉，经查询资料知道ADT22.3.x前的版本不会有这种情况。

作用是兼容老版本的系统的ActonBar。

打开readme 发现:

Library Project including compatibility ActionBar.

This can be used by an Android project to provide
access to ActionBar on applications running on API 7+.

There is technically no source, but the src folder is necessary
to ensure that the build system works. The content is actually
located in libs/android-support-v7-appcompat.jar.
The accompanying resources must also be included in the application.

为了解决兼容API 7+ (anroid2.1+)系统的问题

解决方法：Minimun Required SDK 调大。不兼容旧版本的android系统。

解决方法2：重新clear 两个项目去掉红叉

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