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

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，在开发人员选项菜单中有一个名为

撤销USB调试授权。

一旦你撤销所有现有的授权，它会再次要求信任你正在使用的计算机，之后它开始再次显示日志。

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。

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

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.