預覽layout.xml檔案時提示：

This version of the rendering library is more recent than your version of ADT plug-in. Please update ADT plug-in

導致無法正常預覽佈局檔案；

問題根源：SDK版本過高，ADT版本低；

解決辦法有好幾種，如下：

1.

1. Click Help > Install New Software.
2. In the Work with field, enter: https://dl-ssl.google.com/android/eclipse/
3. Select Developer Tools / Android Development Tools
   .
4. Click Next and complete the wizard. 

2.

3，

Change the Target version to new updates you have. Otherwise, change what SDK version you have in the Android manifest file.

android:minSdkVersion="8"
android:targetSdkVersion="18"