对我来说，问题在于设备是在“仅充电”模式下连接的。

将模式更改为媒体设备(MTP)(或在某些设备中传输文件)解决了问题。

步骤1:连接你的手机与Android开发者选项和USB调试。

步骤2:进入“查看>工具窗口> Logcat”

第三步:在运行项目之前，确保你的手机连接Android Studio。然后运行应用

注意:如果不能显示Logcat，请重新启动Android Studio: File > Invalid Caches/ Restart

Logcat的右边有一个小图标。您可以使用该图标打开和关闭logcat。我通常可以通过单击图标(可能几次)使logcat激活。

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!!

在Android studio 0.8.0中，您应该在运行应用程序之前通过Tools -> Android启用ADB集成。然后日志猫将正常工作。请注意，如果您在应用程序运行时禁用ADB集成，然后再次启用它，那么日志猫不会显示任何东西，除非您重新构建项目。

这些帮助了我:

1.启用ADB集成 2. 进入Android设备监视器 检查您的设备是否在线，并创建所需的过滤器