APPCOMPAT_V7 issues with new ADT when creating a project

Android developers have recently discovered that after updating ADT to 22.6.0, a new Setup project will appear, and the contents of the appcompat_v7 are created. and create a new content that will appear. What the hell is going on here? The original appcompat_v7 is Google's own one of the compatibility package, is a support library, can make more than 2.1 full use of the 4.0 version of the interface. The following let the author take you slowly approached this problem and solve it. 1. First we open eclipse, create a new Android project, where the name is "test", all the way to the default next down, and finally "finish" to complete the project creation. 2. You will find that after the project is created, the workspace column in addition to the "Test" project we created, there is a package called "Appcompat_v7", and the package shows an error (red X), and the "test" package shows a red exclamation mark. Questions about APPCOMPAT_V7 When creating a project with the new ADT 3 If you are not accustomed to APPCOMPAT_V7 package automatic generation and delete this package, then the "test" package will have a lot of errors. So how do you settle this series of questions? Take a look at the workaround below. WORKAROUND: 1 First solve the project after the completion of the APPCOMPAT_V7 package error. The test package has a red warning issue. Click "Project" on the menu bar, select "Clean", then "OK", and when clean is complete, you will find the APPCOMPAT_V7 package error. The problem with the red warning in the test package has been resolved, except that the test package has a yellow warning, just because the import class in Test's Java file is not being used, so it is completely out of control. If it does not work, then right-click Appcompat_v7 package, select Properties, click "Android", if the library under the "Is Library" box is not checked, tick, click "OK", then follow the above steps to perform "clean" Operation. After the 2APPCOMPAT_V7 package is deleted, the test project has various errors, stating that the test project is dependent on the APPCOMPAT_V7 package, so this APPCOMPAT_V7 package cannot be deleted. Then you don't have to take care of the bag, just do your project. 3 If you're still brooding over the appcompat_v7 bag, I'll tell you how to build a project without the APPCOMPAT_V7 package. Since the APPCOMPAT_V7 package is a support library that allows more than 2.1 to use the 4.0 version of the interface, when we build the project, we simply select the minimum SDK above Android4.0 and don't need this support library? The result proves that our idea is right. AboveContents excerpt from http://jingyan.baidu.com/article/3ea51489e04eb852e61bbaa4.html

A appcompat_v7 problem occurred while creating a project with the new ADT