如何为Android4.4W安装系统映像(API 20)

Question

我是Android开发的新手。我遵循http://developer.android.com/上的安装说明，所以我下载了Eclipse。在尝试创建和Android虚拟设备(AVD)时，OK按钮被禁用，因为我没有为目标安装系统映像(Android4.4W-API级别20)。因此，我启动了来下载和安装它们，但我看不到安装它们的任何选项，也看不到“Android4.4W (API20)”下的"Android源代码“。下面是我的Android管理器的快照：

如何为Android4.4W安装系统映像(API 20)

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编辑：，正如@ashoke所建议的，我安装了独立的SDK工具，但这也只显示了以下内容：

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在启动SDK管理器时，我会得到以下异常：

[2014-09-13 00:44:05 - SDK Manager] [SDK Manager] Exception in thread "Loading Sources" java.lang.UnsatisfiedLinkError: sun.net.PortConfig.getLower0()I
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.net.PortConfig.getLower0(Native Method)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.net.PortConfig.<clinit>(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.net.SocketPermission$1.run(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.net.SocketPermission$1.run(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.security.AccessController.doPrivileged(Native Method)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.net.SocketPermission.initEphemeralPorts(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.net.SocketPermission.<clinit>(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.util.SecurityConstants.<clinit>(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.lang.Class.getProtectionDomain(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.JceSecurity$2.run(JceSecurity.java:226)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.security.AccessController.doPrivileged(Native Method)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.JceSecurity.getCodeBase(JceSecurity.java:224)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.JceSecurityManager.getCryptoPermission(JceSecurityManager.java:107)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.Cipher.getConfiguredPermission(Cipher.java:2503)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.Cipher.initCryptoPermission(Cipher.java:685)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.Cipher.chooseProvider(Cipher.java:848)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at javax.crypto.Cipher.init(Cipher.java:1348)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherBox.<init>(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherBox.newCipherBox(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherSuite$BulkCipher.newCipher(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.CipherSuite.isAvailable(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.SSLContextImpl.getApplicableCipherSuiteList(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.SSLContextImpl.getDefaultCipherSuiteList(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.SSLSocketImpl.init(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.SSLSocketImpl.<init>(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at sun.security.ssl.SSLSocketFactoryImpl.createSocket(Unknown Source)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.conn.ssl.SSLSocketFactory.createSocket(SSLSocketFactory.java:342)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.UrlOpener.openWithHttpClient(UrlOpener.java:404)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.UrlOpener.openUrl(UrlOpener.java:183)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.DownloadCache.openUrl(DownloadCache.java:293)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.DownloadCache.downloadAndCache(DownloadCache.java:676)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.DownloadCache.openCachedUrl(DownloadCache.java:598)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.AddonsListFetcher.fetchXmlUrl(AddonsListFetcher.java:267)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.AddonsListFetcher.fetch(AddonsListFetcher.java:132)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.updater.PackageLoader.loadRemoteAddonsListInTask(PackageLoader.java:460)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.updater.PackageLoader.access$200(PackageLoader.java:47)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.updater.PackageLoader$3.run(PackageLoader.java:430)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdkuilib.internal.tasks.ProgressView$2.run(ProgressView.java:140)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdkuilib.internal.tasks.ProgressView.startTask(ProgressView.java:162)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdkuilib.internal.tasks.ProgressViewFactory.start(ProgressViewFactory.java:46)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.updater.PackageLoader.loadRemoteAddonsList(PackageLoader.java:427)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdklib.internal.repository.updater.PackageLoader$1.run(PackageLoader.java:233)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at com.android.sdkuilib.internal.tasks.ProgressView$2.run(ProgressView.java:130)
[2014-09-13 00:44:05 - SDK Manager] [SDK Manager]   at java.lang.Thread.run(Unknown Source)

Answer 1

请检查“工具”下的设置，查看是否启用了预览工具。我的Android管理器显示了系统图像供穿，请参见下面(还包括我的设置屏幕截图)：

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如果在您验证了您的设置之后，它仍然无法工作，我将下载SDK工具，只打包http://developer.android.com/sdk/index.html并尝试使用它。

此外，尝试将https强制到选项下的http，以消除在执行ssl时的异常。

Answer 2

您正在代理服务器上运行互联网，所以请在Android中指定Manager>Tools>Proxy设置中的服务器地址和端口地址，输入这些地址，然后就可以了。