安装了最新版的Android SDK (r21) 和ADT 21.0.0，在虚拟机运行程序时突然发现一个现象，原来运行很正常的程序，现在在logcat中不断的发送以下消息： Unexpected value from nativeGetEnabledTags: 0

此消息大量出现以致于我正常的消息都完全被淹没了。在网上查了一下，原来是API 17的虚拟机会有这个问题：

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As indicated above, we're aware of the issue. It's an issue in the emulator system-image for API 17. We plan to distribute a new system-image for 17 that will resolve this, but I don't have any hard date to announce.Workarounds in between are to use the emulator with API 16 (doesn't help if you need the APIs for 17 of course) or use a real device such as N4 or N7 or N10 that has API 17 on it.

后来在网上找到一个解决办法：在logcat的过滤器的log message字段中输入以下过滤串。

^(?!.*(nativeGetEnabledTags)).*$