重新启动我正在测试的手机就解决了这个问题。

我用的是旧的LG4和Android 6。

我试着拔了又插，重新启动Android Studio，重新启动logcat，使缓存无效-什么都没有工作。

对我来说，它不仅适用于我的应用程序，它正在工作，如果没有选择过滤器(右侧的选项)。但我只需要看到我的应用程序，因此我发现，如果我做我自己的过滤器，过滤它的包名，它是工作，因为它应该。我希望它也能帮助到你:)

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。

我刚把它修好了。在DDMS显示的最右边寻找恢复Devices Logcat视图和ADB视图的小图标。

When the DDMS first came up with both the "ADB Logs" and the "Devices | logcat" tab showing. The "Devices | logcat" is the one that should be showing the device output, but was blank. Somehow I managed to hide one or the other of those tabs, I forget exactly how. But, off to the right there was a tiny icon that said "Restore ADB" view, and I clicked it and it came up. Then there was another tiny icon that said "Restore Devices logcat view". I clicked that, and all of a sudden it appeared and was showing the device output again.

今天也遇到了同样的问题。

显然，我也运行了eclipse，所有的logcat输出都被重定向到eclipse。由于日志只能在一个地方显示，请确保您没有运行多个调试器。

确保您已经在build variables上下文菜单中启用了构建变量以“调试”。(你可以在窗口的左下角找到它)。如果您之前已经为应用程序签署了apk，则此选项将被设置为发布模式。这将导致调试消息不显示在日志猫中。