打開Eclipse出現以下訊息～
The Android SDK requires Android Developer Toolkit version 21.1.0 or above.
Current version is 21.0.1.2012-12-6-2-58.
Please update ADT to the latest version.
接著還出現 ”installing software has encountered a problem”
解決方式：
Window → Preferences → Install/Update → Available Software Sites
點選 adt 按 edit
將http://dl-ssl.google.com/android/eclipse/
改成 https://dl-ssl.google.com/android/eclipse/
