预览layout.xml文件时提示：
This version of the rendering library is more recent than your version of ADT plug-in. Please update ADT plug-in
导致无法正常预览布局文件；
问题根源：SDK版本过高，ADT版本低；
解决办法有好几种，如下：
1.
- Click Help > Install New Software.
- In the Work with field, enter:
https://dl-ssl.google.com/android/eclipse/ - Select Developer Tools / Android Development Tools.
- Click Next and complete the wizard.
2.
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Change android version while rendering layout. |
3，
Change the Target version to new updates you have. Otherwise, change what SDK version you have in the Android manifest file.
<code><span class="pln">android</span><span class="pun">:</span><span class="pln">minSdkVersion</span><span class="pun">=</span><span class="str">"8"</span><span class="pln"> android</span><span class="pun">:</span><span class="pln">targetSdkVersion</span><span class="pun">=</span><span class="str">"18"</span></code>