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普通的高度是64dp，扩展的最大是256dp。
原始文档如下：
The height available for a custom notification layout depends on the notification view. Normal view layouts are limited to 64 dp, and expanded view layouts are limited to 256 dp.
http://developer.android.com/guide/topics/ui/notifiers/notifications.html
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原文地址：http://blog.csdn.net/forlong401/article/details/44857299
