这不是一个技术性的答案，但您可能想要检查logcat的搜索框。如果输入了任何字符，你的logcat将为空，因为它将搜索特定的字符或单词，然后如果它不存在，你的logcat日志将完全为空。

Easy fix that worked for me (after trying some of these other suggestion). My logcat was sitting blank in a separate window (on my second screen). Just had to drag the Logcat tab back to it's original place in the debug panel next to the Debugger and Console tabs, and VOILA... it began immediately updating and showing all processes verbose. So (If your logcat is anywhere outside of the debugger panel (i.e. the logcat tab isn't sitting nested alongside the debugger and console tab) then it won't receive updates and will sit there blankly. Don't know if this is an issue with older versions of Android Studio. But again, easy to try and if it works... it works!!

如果你使用Android模拟器，你可以擦除数据，然后再次启动模拟器。只有这个对我有用

禁用并卸载您最近安装且不使用的任何插件。

就我而言，我试图用其他答案来解决这个问题，但没有结果。我无意中发现，空标签几乎从未显示(Android Studio 1.4)。因此，尝试在TAG中放入任何字母(空格无效)。

Log.wtf("x", "Android Studio Team, solve this, please!");

我有同样的问题，但我解决了以下步骤，试一次。

1)在android工作室。

2)打开android Monitor窗口(android studio底部)

3)你可以看到右下角的下拉(旋转器)

4) select—只显示选中的应用程序。