还要小心这个坏男孩(即使重新启动android studio也没有消失):

确保在模拟器开发人员菜单选项中有记录器缓冲区大小适当值。

执行->debug命令 如果你失去了与主机的连接，它会要求重新连接。单击yes。这样就行了。

在我的例子中，它通过TCP连接断开，即使设备出现了。

调用

adb connect <device ip>

重启logcat OK。

在“设备logcat”选项卡的右侧有一个按钮“只显示所选进程的logcat”。它并不完美，因为每次我运行另一个进程时，我都需要再次推动它，但这是唯一适合我的解决方案。到目前为止…

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!!