无法安装Android 4.2 API

I updated ADT through Eclipse today to version 21. Now when I open the SDK Manager I would expect there to be a folder like "Android 4.2 (API 17)", which would contain the SDK Platform and APIs, documentation, etc. However, instead I just get a folder called "API 17", and the only thing in it is "Google APIs", which I can't even install because

我今天通过Eclipse更新了ADT到21版。现在当我打开SDK Manager时，我希望有一个像“Android 4.2（API 17）”的文件夹，其中包含SDK平台和API，文档等。但是，相反，我只得到一个名为“API 17”的文件夹，其唯一的东西是“Google API”，我甚至无法安装，因为

Installing this package also requires installing: - Missing SDK Platform Android, API 17

安装此软件包还需要安装： - 缺少SDK平台Android，API 17

What do I do here? Thanks

我该怎么办？谢谢

7 个解决方案

#1

225

I figured this out myself after some poking around. I went into the settings for the SDK Manager, cleared the cache, and told it to use HTTPS, then refreshed the listing and it all appeared normally.

经过一番探讨，我自己想出了这个。我进入了SDK管理器的设置，清除了缓存，并告诉它使用HTTPS，然后刷新列表，它们都正常显示。

#2

Eclipse > Window > Android SDK Manager > Packages > Reload

Eclipse> Window> Android SDK Manager> Packages> Reload

It then properly updated the UI to let me choose updated software.

然后它正确更新了UI，让我选择更新的软件。

Why do I need to click "Reload" manually ?! I expect that to happen automatically when I open the SDK Manager.

为什么我需要手动点击“重新加载”？我希望在打开SDK Manager时自动发生这种情况。

#3

By this step~

通过这一步〜

1) Eclipse > Window > Android SDK Manager > Packages > Reload

1）Eclipse> Window> Android SDK Manager> Packages> Reload

2) then install the sdk

2）然后安装sdk

ref: http://my.eoe.cn/iceskysl/archive/1027.html

参考：http：//my.eoe.cn/iceskysl/archive/1027.html

#4

Eclipse > Window > Android SDK Manager > Preferences > Clear Cache Button click> Done.

Eclipse> Window> Android SDK Manager>首选项>清除缓存按钮单击>完成。

#5

I had this problem in ubuntu.

我在ubuntu中遇到过这个问题。

Open a terminal and navigate to the android-sdk-linux folder: cd android-sdk-linux

打开终端并导航到android-sdk-linux文件夹：cd android-sdk-linux
Then manually update the sdk: tools/android update sdk -u

然后手动更新sdk：tools / android update sdk -u

After it is done, restart Eclipse.

完成后，重新启动Eclipse。

#6

As error suggest : API 18 depends on SDK version n etc etc. So first update SDK tool to latest version (deselect API 18) then try to install API 18.

正如错误所示：API 18依赖于SDK版本n等等。因此，首先将SDK工具更新为最新版本（取消选择API 18），然后尝试安装API 18。

#7

Try approving each package one by by instead of doing approve all. If any package has an error, you can't download all at the same time.

尝试逐个批准每个包，而不是批准所有。如果任何包有错误，则无法同时下载所有包。

#1

225