I'm new with Android and the project appcompat_v7 always be created when I create new Android application project makes me so uncomfortable. This is just a walk around. Choose Project Properties -> Android then at Library box just remove appcompat_v7_x and add appcompat_v7. Now you can delete appcompat_v7_x. Uncheck Create Activity in create project wizard doesn't work, because when creating activity by wizard the appcompat_v7_x appear again. My ADT's version is v22.6.2-1085508. I'm sorry if my English is bad.

之所以包含它，是因为您的最低SDK版本设置为10。ActionBar是在API 11中引入的。Eclipse会自动添加它，这样你的应用就能在你支持的所有android版本中看起来更加一致。

根据http://developer.android.com/guide/topics/ui/actionbar.html

ActionBar API最初是在Android 3.0 (API级别11)中添加的，但它们也可以在支持库中使用，以兼容Android 2.1 (API级别7)及以上。

简而言之，你所看到的自动生成项目模块化了将ActionBar添加到api 7-10的过程。

有关该主题的简化解释和教程，请参阅http://hmkcode.com/add-actionbar-to-android-2-3-x/。

为什么我的eclipse自动添加appcompat v7库支持 每当我创建一个新项目

因为您的目标SDK设置为15，其中操作栏默认开启，您的最小支持SDK设置为10。操作栏在11年推出，所以你需要一个支持库，Eclipse为你添加了它。参考。

您可以在项目属性的构建路径中配置项目库。

我注意到在创建ADT 22.6.2版本的新android项目时创建了“appcompat”库，即使minSDK设置为11,targetSDK设置为19

这是因为，在新的项目模板中，android正在使用一些来自支持库的属性。例如，如果一个新项目是用actionbar创建的，那么在菜单的main.xml中，你可以从支持库中找到app:showAsAction="never"。

If the app is targeted at android version 11 and above then one can change this attribute to android:showAsAction in menu's main.xml Also the default theme set could be "Theme.AppCompat.Light.DarkActionBar" as shown below (styles.xml) <style name="AppBaseTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <!-- API 14 theme customizations can go here. --> </style> In this case the parent theme in style.xml has to be changed to "android:style/Theme.Holo.Light.DarkActionBar" In addition to this if reference to Fragment,Fragments Manager from support library was made in the code of MainActivity.java, these have to appropriately changed to Fragment, FragmentManager of the SDK.

I'm new with Android and the project appcompat_v7 always be created when I create new Android application project makes me so uncomfortable. This is just a walk around. Choose Project Properties -> Android then at Library box just remove appcompat_v7_x and add appcompat_v7. Now you can delete appcompat_v7_x. Uncheck Create Activity in create project wizard doesn't work, because when creating activity by wizard the appcompat_v7_x appear again. My ADT's version is v22.6.2-1085508. I'm sorry if my English is bad.