（2）Android-sdk下载地址：
http://dl.google.com/android/android-sdk_r23.0.2-windows.zip
http://dl.google.com/android/installer_r23.0.2-windows.exe
http://dl.google.com/android/android-sdk_r23.0.2-macosx.zip
http://dl.google.com/android/android-sdk_r23.0.2-linux.tgz
