在终端中执行此命令。它将重新开始工作。

adb kill-server && adb start-server

需要连续两次按“Alt+6”重新启动logcat窗口。这样它就会显示日志输出。

问题主要发生在调试模式。

所有这些都无济于事，我的日志猫功能失常。

After a lot of angry searching I found a solution that seems to work: 1. Make sure logcat itself is working (use DDMS from Tools->Android) and if it does close DDMS window again 2. Now go to Tab 5 (Debug), there select Logcat (this is not the same logcat as in Window 6!) 3. The window is empty just like Window 6, but now start a debugging run. For me logcat in the Debug window now started to show all the stuff again! Also when normally running the application the Debug->logcat view is still functional while the Tool Window #6 "logcat" is disfunctional as before

这是一个黑客，但是它会导致正常的logcat行为，突出显示您调试和开发所需的行和语法。 从现在开始，您需要通过调试窗口访问它。

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。

重新启动Android Studio帮助了我。

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。