为我禁用验证应用程序通过USB和验证字节码 可调试的应用程序帮助我使logcat更加可靠。

试着关闭项目，然后重新打开它。这对我很有用。日志将重新出现。

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。

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。

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:)

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!!