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我是Android開發新手。我遵循http://developer.android.com/上的設置說明，因此我下載了Eclipse ADT。在嘗試創建Android虛擬設備（AVD）時，確定按鈕被禁用，因爲我沒有爲目標（Android 4.4W - API Level 20）安裝系統映像。所以我推出了Android SDK Manager來下載和安裝它們，但是我沒有看到任何安裝它們的選項，也沒有看到「Android 4.4W（API20）」下的「android sdk的源代碼」。這是我在Android SDK管理器的快照：如何爲Android 4.4W安裝系統映像（API 20）
如何做我安裝系統映像爲Android 4.4W（API 20）
編輯： 作爲建議的@ashoke我安裝單機SDK工具，但只是太顯示了這個： 
在啓動SDK管理器中我得到這個異常：
[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)
我有啓用了預覽工具，但仍然有相同的行爲。現在只會嘗試下載SDK工具包，謝謝。 – 2014-09-12 18:15:04
我試過'SDK工具只有'，你能否建議如何繼續。 – 2014-09-12 18:37:16
將您的eclipse IDE指向新的android SDK路徑。由於您已經安裝了ADT，因此如果需要，請按照配置部分http://developer.android.com/sdk/installing/installing-adt.html和故障排除部分進行操作。 – ashoke 2014-09-12 18:47:41