I. SDK Manager 打不开
where java
检测你的jdk环境变量，如果system32在前，调整你path中的的%java_home%\bin在c:\windows\systeme32前。保存后，重启cmd窗口。引用：http://zhidao.baidu.com/link?url=bGCzM6GHj70sA1ZERfIQFhXrCw86nabFxHZb5o9W93xfb-9deVelyLbuij6YGbukfNWLPsCKtlNffNT61ut06_
II. UPDATE不了。
A. 速度较慢
1. 开GoAgent。
2. option 挂上。
B. 速度较快
1.开迅雷，下载：
https://dl-ssl.google.com/android/repository/sys-img/x86/google_apis_x86-19_r10.zip
http://dl-ssl.google.com/android/repository/build-tools_r21.1.2-windows.zip
https://dl-ssl.google.com/android/repository/docs-21_r01.zip
https://dl-ssl.google.com/android/repository/samples-21_r04.zip
https://dl-ssl.google.com/android/repository/android-21_r02.zip
https://dl-ssl.google.com/android/repository/tools_r24.0.2-windows.zip
https://dl-ssl.google.com/android/repository/sources-21_r01.zip
https://dl-ssl.google.com/android/repository/google_apis-21_r01.zip
https://dl-ssl.google.com/android/repository/google_tv-13_r01.zip
https://dl-ssl.google.com/android/repository/support_r21.0.3.zip
https://dl-ssl.google.com/android/repository/android_m2repository_r11.zip
https://dl-ssl.google.com/android/repository/market_licensing-r02.zip
https://dl-ssl.google.com/android/repository/market_apk_expansion-r03.zip
https://dl-ssl.google.com/android/repository/google_play_services_6587000_r22.zip
https://dl-ssl.google.com/android/repository/usb_driver_r11-windows.zip
https://dl-ssl.google.com/android/repository/play_billing_r05.zip
https://dl-ssl.google.com/googleadmobadssdk/googleadmobadssdkandroid-6.4.1.zip
https://dl.google.com/gaformobileapps/GoogleAnalyticsAndroid_2.0beta5.zip
https://dl-ssl.google.com/android/repository/webdriver_r02.zip
https://dl-ssl.google.com/android/repository/gcm_r03.zip
https://dl-ssl.google.com/android/repository/simulator_r01.zip
https://dl-ssl.google.com/android/repository/support_r19.1.zip
https://dl.google.com/glass/xe22/google-gdk.zip
https://dl-ssl.google.com/android/repository/extras/intel/haxm-windows_r05.2.zip
https://dl-ssl.google.com/android/repository/sys-img/android/sysimg_arm-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android/sysimg_x86_64-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android/sysimg_mips-17_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android-wear/sysimg_wear_arm-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android-wear/sysimg_wear_x86-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android-tv/sysimg_atv_x86-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/android-tv/sysimg_atv_arm-21_r01.zip
https://dl-ssl.google.com/android/repository/sys-img/google_apis/sysimg_x86-21_r03.zip
https://dl-ssl.google.com/android/repository/sys-img/google_apis/sysimg_x86_64-21_r03.zip
https://dl-ssl.google.com/android/repository/sys-img/google_apis/sysimg_arm-21_r03.zip
//压缩包因版本改变而改变
2.离线安装，参考文章：http://blog.csdn.net/harvic880925/article/details/37913801