blocks|key|286958|text|重新启动logcat总是对我有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286959|​|286960|📷|atomic|offset|length|286961|286962|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/977273978727b060746ac9a018a59545.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Restarting logcat helps me always. 

<img src="https://i.stack.imgur.com/3qHkR.png" alt="enter image description here">

blocks|key|70123|text|这些对我很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70124|1.启用ADB集成|70125|📷|atomic|offset|length|70126|转到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|70127|70128|70129|70130|70131|​|70132|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/bec763abfb904bfc4b249e9400cf019c.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/943223d44559dc796a2556bc322a6843.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/592611061a7b8ea2879e4ce368e8d5ff.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/e5b16d204b1f6681990110d18d0bf5f6.png|4|https://ask.qcloudimg.com/http-save/yehe-900000/1cfb5ef03e7b19a6f767e77e48642f76.png^0|0|0|0|1|0|0|0|0|1|1|0|0|1|2|0|0|1|3|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|18|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|19|8|@]|9|@$G|1A|H|1B|1|1C]]|A|$]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|E|5|F|7|1E|8|@]|9|@$G|1F|H|1G|1|1H]]|A|$]]|$1|L|3|E|5|F|7|1I|8|@]|9|@$G|1J|H|1K|1|1L]]|A|$]]|$1|M|3|E|5|F|7|1M|8|@]|9|@$G|1N|H|1O|1|1P]]|A|$]]|$1|N|3|E|5|F|7|1Q|8|@]|9|@$G|1R|H|1S|1|1T]]|A|$]]|$1|O|3|P|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]|Z|$5|T|U|V|A|$W|10|Y|-4]]|11|$5|T|U|V|A|$W|12|Y|-4]]|13|$5|T|U|V|A|$W|14|Y|-4]]|15|$5|T|U|V|A|$W|16|Y|-4]]]]

These helped me :

1.Enable ADB integration
 <img src="https://i.stack.imgur.com/OasJE.png" alt="enter image description here">
2. Go to Android Device Monitor 
Check if your device is online and Create a required filter
<img src="https://i.stack.imgur.com/NsNi0.png" alt="enter image description here">
 <img src="https://i.stack.imgur.com/3Bz66.png" alt="enter image description here">
<img src="https://i.stack.imgur.com/Nf2MO.png" alt="enter image description here">
<img src="https://i.stack.imgur.com/hULcU.png" alt="enter image description here">

blocks|key|70805|text|在终端中运行此命令。它将重新开始工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70806|adb+kill-server+&&+adb+start-server|code-block|syntax|javascript|70807|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Run this command in terminal. It will start working again.

<pre><code>adb kill-server &amp;&amp; adb start-server
</code></pre>

blocks|key|287148|text|在android+Studio应用程序中，您需要单击Debug+application+option+(Shift%2Bf9)以在调试模式下运行并启用LogCat。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287149|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In android Studio application you need to click Debug application option (Shift+f9) to run in debug mode and to enable LogCat.

blocks|key|70543|text|重启Android+Studio对我很有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70544|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Restarting Android Studio helped me.

blocks|key|287294|text|这不是技术上的答案，但您可能需要检查logcat的搜索框。如果有任何字符输入，你的logcat将是空的，因为它将搜索特定的字符或单词，然后如果它不存在，你的logcat日志将是完全空的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287295|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Not a technical answer but you might want to check the search box for the logcat. If there is any character inputted, your logcat will be empty as it will be searching for that certain character or word, and then if its not present, your logcat log will be totally empty.

blocks|key|288141|text|确保您的模拟器开发人员菜单选项中有Logger+buffer+sizes+value。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|288142|​|288143|📷|atomic|offset|length|288144|288145|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/89ceb9bb471d784ee406c812d52e5a95.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Make sure you have Logger buffer sizes propper value in your emulator developer menu option.

<a href="https://i.stack.imgur.com/V6hIH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/V6hIH.png" alt="enter image description here"></a>

blocks|key|287921|text|对我来说，问题是我有两个同名的仿真器(我创建了它，删除了它，然后用相同的名称重新创建了它)。logcat下拉列表中有两个仿真器条目，但它连接到了错误的条目。我所要做的就是换到另一个。我通过重命名模拟器永久地防止了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287922|​|287923|📷|atomic|offset|length|287924|287925|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2a02a6d0034ed202e3d1c4e44ee8711d.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

For me, the issue was that I had two emulators with the same name (I created it, deleted it, and then created it again with the same name). There were two emulator entries in the logcat dropdown and it was connected to the wrong one. All I had to do was switch to the other one. I prevented the problem permanently by renaming the emulator.

<a href="https://i.stack.imgur.com/eITSC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eITSC.png" alt="enter image description here"></a>

blocks|key|70569|text|在我的示例中，在开发人员选项菜单中有一个名为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70570|Revoke+USB+debugging+authorisations。|offset|length|style|CODE|70571|一旦您撤销了所有现有的授权，它将再次要求您信任您正在使用的计算机，之后它将再次开始显示日志。|70572|entityMap^0|0|0|Z|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

In my case, in the developer options menu there is an option called 

<code>Revoke USB debugging authorisations</code>. 

Once you revoke all the existing authorisations it will ask again to trust the computer that you are using after that it started to show the logs again.

blocks|key|70613|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70614|📷|atomic|offset|length|70615|70616|在我的例子中，我从右边的小下拉列表中删除了"image“。在那之后，它显示得很好。这是因为它将在日志中搜索该搜索框中的关键字，因此如果没有找到任何匹配，它将返回空白|70617|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c135cacd35ee9c413f126be85c4a65ee.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@$E|U|F|V|1|W]]|A|$]]|$1|G|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

<a href="https://i.stack.imgur.com/ETUyY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ETUyY.png" alt="enter image description here"></a>

In my case, I removed "image" from the little dropdown on the right. It showed up just fine after that. That's because it will be searching the log for the keyword in that searchbox, so if it doesn't find any matches, it returns blank

blocks|key|68711|text|这可能不是你的问题，但我发现当Android+Studio的多个窗口打开时，logcat只会指向其中的一个，而不一定是正在运行活动应用程序的那个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|68712|例如，窗口1是我开发Tic-Tac-Toe应用程序的地方，窗口2是我开发天气应用程序的地方。如果我在调试模式下运行天气应用程序，可能只有窗口1能够显示logcat条目。|68713|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

This may not be your issue, but I've found that when having multiple windows of Android Studio open, logcat is only directed to one of them, and not necessarily the one that's running an active application.

For example, Window 1 is where I'm developing a Tic-Tac-Toe app, and Window 2 is where I'm developing a weather app. If I run the weather app in debug mode, it's possible only Window 1 will be able to display logcat entries.

blocks|key|287248|text|在"Devices+logcat“选项卡的右侧有一个按钮"Show+only+Logcat+from+selected+Process”。这并不完美，因为每次我运行另一个进程时，我都需要再次推送它，但这是唯一对我有效的解决方案。到目前为止。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287249|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

On the right side of tab "Devices logcat" there is the button "Show only Logcat from selected Process". Its not perfect, because everytime I run another process I need to push it again, but thats the only solution that works for me. So far...

blocks|key|288064|text|对我来说，问题是设备是在Charge+only模式下连接的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|288065|将模式更改为Media+device+(MTP)+(或某些设备中的Transfer+files+)解决了问题。|288066|entityMap^0|C|B|0|6|I|X|E|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

For me, the problem was that the device was connected in the <code>Charge only</code> mode.

Changing the mode to <code>Media device (MTP)</code> (or <code>Transfer files</code> in some devices) solved the problem.

blocks|key|69300|text|在Android+studio+0.8.0中，您应该在运行您的应用程序之前，通过Tools+->+Android启用ADB集成。那么log+cat就可以正常工作了。请注意，如果您在应用程序运行时禁用了ADB集成，并再次启用它，那么除非您重新构建项目，否则log+cat不会显示任何内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|69301|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In Android studio 0.8.0 you should enable ADB integration through Tools -> Android, before run your app. Then the log cat will work correctly. Notice that if you make ADB integration disabled while your app is running and again make it enable, then the log cat dosen't show anything unless you rebuild your project.

blocks|key|287753|text|在我的例子中，我只是过滤了输出，所以即使在重新启动Logcat等之后，它也显示为空。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287754|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case I just had filtered the output so it appeared empty even after restarting Logcat etc.

blocks|key|288273|text|我检查了答案，只是在检查我的logcat时意外发现了我的错误。确保右边的框显示“仅显示选定的应用程序”。我的显示是"+Firebase+"，所以它显示了来自Firebase的消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|288274|​|288275|📷|atomic|offset|length|288276|288277|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/aed2f4733a677f6bccf059c589b2e694.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

I checked the answer and only found my mistake accidentally while checking my logcat.
Make sure the box on the right says "Show only selected application". Mine was showing "Firebase", so it showed me messages from Firebase.

<a href="https://i.stack.imgur.com/HHru4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HHru4.png" alt="enter image description here"></a>

blocks|key|287105|text|今天也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287106|显然，我也运行了eclipse，并且所有的logcat输出都被重定向到eclipse。由于日志只能显示在一处，因此请确保您没有运行多个调试器。|287107|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Had the same issue today.

Apparently I had eclipse running too and all the logcat output was redirected to eclipse. Since the logs can only be shown at once place, make sure you dont have multiple debuggers running.

blocks|key|70016|text|确保导入的是正确的类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70017|import+android.util.Log;|code-block|syntax|javascript|70018|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Make sure you are importing the right class 

<pre><code>import android.util.Log;
</code></pre>

blocks|key|70205|text|我刚把它修好了。查看DDMS显示屏最右侧的小图标，这些图标可恢复Devices+Logcat视图和ADB视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70206|当DDMS第一次显示"ADB+Logs“和"Devices+%7C+logcat”选项卡时。"Devices+%7C+logcat“应该显示设备输出，但却是空白的。不知何故，我设法隐藏了其中的一个或另一个选项卡，我忘记了具体是如何隐藏的。但是，在右边有一个很小的图标，上面写着“恢复ADB”视图，我点击它，它就出现了。然后是另一个小图标，上面写着“恢复设备日志视图”。我点击了一下，它突然出现了，并且再次显示了设备输出。|70207|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I just fixed it on mine. Look for tiny icons on the far right of the DDMS display which restore the Devices Logcat view and the ADB View. 

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.

blocks|key|288099|text|在使用模拟器时，我偶尔会想到这一点。我只需插入一个设备并运行应用程序。Logcat重新开始工作，当我返回到模拟器时，它也会继续工作。我猜只需切换两个设备和/或模拟器也能达到目的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|288100|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

That occasionally occurs to me while using emulator. I just plug in a device and run the app. The Logcat gets back to work and so it does when I get back to the emulator. 
I guess that just switching two devices and/or emulators does the trick as well.

blocks|key|71078|text|也要小心这个坏男孩(即使重启android+studio也不会消失)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|71079|​|71080|📷|atomic|offset|length|71081|71082|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/ea3d2c830db26a48c021773a707c7d22.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Also be careful for this bad boy (even with Restart of android studio not disappeared):
<a href="https://i.stack.imgur.com/AW93g.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AW93g.png" alt="enter image description here" /></a>

blocks|key|286803|text|logcat在Logcat的右侧有一个小图标。您可以使用图标打开和关闭logcat。我通常可以通过点击图标激活logcat+(可能需要多次点击)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286804|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Logcat has a little icon to the right of logcat. You can use the icon to turn logcat on and off. I can usually make logcat active by clicking the icon (maybe several times).

blocks|key|287015|text|对我来说，它不仅仅适用于我的应用程序，如果没有选择任何过滤器(右侧的选项)，它就可以工作。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，并将其过滤为包名，它就会像它应该的那样工作。我希望它也能对你有所帮助：)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287016|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me it was not working only for my application, it was working, if no filter has been selected (option on right side). But I needed to see only my app, therefore I found out, that if I do my own filter and filter it to package name, it is working as it should. I hope it could help to you too : )

blocks|key|69626|text|确保您已在build+Variants上下文菜单中将Build+variant启用为"debug“。(你可以在窗口的左下角找到这个)。如果您之前已经为应用程序签署了apk，则此选项将设置为发布模式。这会导致调试消息不会显示在日志目录中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|69627|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Make sure you have enabled the build variant to "debug" in the Build Variants context menu. (You can find this at the bottom left corner of the window). This option will be set to release mode, if you have signed the apk for the application previously. This causes the debug messages not to show in the log cat.

blocks|key|69999|text|简单的修复对我有效(在尝试了其他一些建议之后)。我的logcat在一个单独的窗口中是空白的(在我的第二个屏幕上)。只需将Logcat选项卡拖回到调试面板中Debugger和Console选项卡旁边的原始位置，瞧……它立即开始更新并显示所有进程的详细信息。因此(如果您的logcat位于调试器面板之外的任何地方(即logcat选项卡不是嵌套在调试器和控制台选项卡旁边)，那么它将不会接收更新，而是空白地位于那里。不知道这是否是旧版Android+Studio的问题。但同样，很容易尝试，如果它有效的话...它成功了！！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70000|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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!!

blocks|key|287411|text|进入运行->调试如果你已经失去了与主机的连接，它将要求许可重新连接。单击yes。这应该就行了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287412|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Go to run->debug 
If incase you have lose connection with host, it will ask permission to reconnect. Click yes. That should do it.

blocks|key|70162|text|我也有同样的症状，但我的问题更简单，而且确实是我的错。我设置了错误的过滤器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70163|解决方案就是验证我是否设置了正确的过滤器。|70164|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had the same symptoms but my problem was way simpler and really my mistake. I had the wrong filter set.

The solution was just to verify that I had the correct filter set.

blocks|key|70261|text|我刚刚更改了applictionId，logcat停止了工作。要重置它，您必须更改包名称。只需点击右上角的下拉显示您的应用程序包名称的Logcat窗口，点击它，然后点击Edit+Filter+Configuration+now更改包的名称。它将开始工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|70262|entityMap^0|6|C|2C|P|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I just changed the <code>applictionId</code> and logcat stopped working. To reset it you have to change the package name. Just click on top right corner drop down in Logcat window which show your app package name and click on it and then click <code>Edit Filter Configuration</code> now change the package name. It will start working.

blocks|key|70300|text|尝试点击"+Android“视图最右边的图标，你应该会在Android视图上看到Logcat标签(你可以通过按Alt%2B6来打开Android视图)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70301|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Try to click on the icon on the very right part of the "Android" view, you should see Logcat tab on the Android view (you can bring Android view up by pressing Alt+6)

blocks|key|287816|text|如果同时使用多个版本的adb，Logcat可能会失败。一个在Android+Studio中，一个在终端中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287817|您可能有不同版本的adb："sudo+apt-get+install+android-tools-adb“将创建/usr/bin/adb包含{+Android+-+SDK+}/platform-tools/adb的android+sdk，或者来自创建/host/linux-x86/bin/adb的AOSP构建的输出|287818|要查看此问题是否会影响您，请使用"Help+idea.log+->+Show+Log+in+Files“打开adb，并查找类似于”初始化adb+using:/home/repkap11/android-sdk/platform-tools/adb".“的行将此路径与终端中的“哪个adb”进行比较。如果它们不匹配，这个问题就会影响到您。|287819|Android+studio会查找{android-sdk}/platform-tools/adb，并不关心您的路径。我用符号链接替换了android-sdk中的adb版本，但简单地说"sudo+apt-get+remove+android-tools-adb“也可以。|287820|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Logcat can fail if you are using more than 1 version of adb at the same time. One in Android Studio, and one in the terminal.

You might have different version of adb from:
"sudo apt-get install android-tools-adb" which will create /usr/bin/adb
the Android SDK which contains {android-sdk}/platform-tools/adb,
or from the output of an AOSP build which creates out/host/linux-x86/bin/adb

To see if this problem effects you, open idea.log using "Help -> Show Log in Files" and look for a line like "Initializing adb using:/home/repkap11/android-sdk/platform-tools/adb". Compare this path with "which adb" in your terminal. If they don't match, this problem effects you.

Android studio looks for {android-sdk}/platform-tools/adb and doesn't care about your PATH. I replaced the version of adb in android-sdk using a symlink, but simply "sudo apt-get remove android-tools-adb" would work as well.

blocks|key|70829|text|在我的例子中，我发送的是空标签，即|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70830|Log.d("","My+Log");|code-block|syntax|javascript|70831|而是发送一个标记名|70832|Log.d("Class+name","My+Log");|70833|希望这能帮助到某个人|70834|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In my case I was sending empty tag i.e

<pre><code>Log.d("","My Log");
</code></pre>

Instead send a tag name

<pre><code>Log.d("Class name","My Log");
</code></pre>

Hope it helps someone

blocks|key|70852|text|重启我正在测试的手机解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70853|我在Android6上用的是旧的LG4。|70854|我再次尝试拔下插头，重新启动Android+Studio，重新启动logcat，使缓存失效--都没有起作用。|70855|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Rebooting the phone I was testing fixed the issue.

I used an old LG4 with Android 6.

I tried unplugging and plugging again, restarting Android Studio, restarting the logcat, invalidating caches - Nothing worked.

blocks|key|69847|text|所有这些都无济于事，我的logcat出故障了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|69848|经过大量愤怒的搜索，我找到了一个似乎有效的解决方案：|69849|确保logcat本身正常工作(从Tools->Android中使用DDMS+)，如果它确实关闭了DDMS窗口againNow，请转到选项卡5(调试)，在那里选择Logcat+(这与窗口6中的logcat不同！)窗口是空的，就像窗口6一样，但现在开始调试运行。|69850|对我来说，调试窗口中的logcat现在又开始显示所有的东西了！|69851|此外，当正常运行应用程序时，Debug->logcat视图仍然起作用，而工具窗口#6+"logcat“像以前一样不起作用|69852|这是一个技巧，但是它会导致正常的logcat行为，并突出显示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。|69853|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

Nothing from all of this helped, my logcat was disfunctional. 

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 

This is a hack, however it leads to the normal logcat behaviour with highlighted lines and syntax you need for debugging and developing.
Just from now on you need to access it through the debug Window.

blocks|key|69972|text|检查你是否隐藏了it...If它隐藏了问题通过给定的图像来显示它或ALT+%2B6|type|unstyled|depth|inlineStyleRanges|entityRanges|data|69973|📷|atomic|offset|length|69974|​|69975|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/da976603e0ad4d2559e9dc9f1ad441ed.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

Check if you have hided it...If it is hiding problems the go through given image to display it or ALT + 6<img src="https://i.stack.imgur.com/LYUyj.png" alt="enter image description here">

blocks|key|70237|text|在我的例子中，它通过TCP连接断开了连接，即使设备出现了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70238|呼叫|70239|adb+connect+<device+ip>|code-block|syntax|javascript|70240|已重新启动logcat+OK。|70241|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case it disconnected over the TCP connection, even though the device appeared.

Calling

<pre><code>adb connect &lt;device ip&gt;
</code></pre>

Restarted logcat OK.

blocks|key|70427|text|在我的例子中，我试图用其他答案来解决这个问题，但没有结果。我无意中发现，空标签几乎从不显示(Android+Studio1.4)。所以，尽量在标签中放入任何字母(空格不起作用)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70428|Log.wtf("x",+"Android+Studio+Team,+solve+this,+please!");|code-block|syntax|javascript|70429|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In my case, I tried to solve this with other answers, with no results. I discovered, unintentionally, that empty tags are almost never shown (Android Studio 1.4). So, try to put any letter (blank spaces won't work) inside the TAG.

<pre><code>Log.wtf("x", "Android Studio Team, solve this, please!");
</code></pre>

blocks|key|287966|text|我在我的手机上有一个自定义的ROM，由于某种原因，它不能输出logcat，但模拟器和另一个设备输出了。擦除和安装ROM使logcat再次工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287967|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had a custom ROM on my phone which for some reason did not output logcat, but the emulator and another device did. Wiping and installing the ROM got the logcat working again.

blocks|key|70936|text|除了所有很好的答案:如果你使用它，确保你导入了正确的BuildConfig。我使用的是BuildConfig.DEBUG，所以有一天我的集成开发环境自动导入了错误的类|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|70937|import+com.google.firebase.BuildConfig;|code-block|syntax|javascript|70938|或者它可能是|70939|import+com.adjust.sdk.BuildConfig;|70940|将import更改为右侧后，一切正常：|70941|import+com.yourapp.BuildConfig;|70942|entityMap^0|Q|B|17|H|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

In addition to all great answers: make sure that you import right <code>BuildConfig</code> if you use it. I'm using <code>BuildConfig.DEBUG</code>, so one day my IDE automatically imported the wrong class
<pre><code>import com.google.firebase.BuildConfig;
</code></pre>
or it may be
<pre><code>import com.adjust.sdk.BuildConfig;
</code></pre>
After changing import to the right one everything was fine:
<pre><code>import com.yourapp.BuildConfig;
</code></pre>

blocks|key|70958|text|重新启动您的logcat。它会被修复的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|70959|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Restart your logcat . It will fixed

blocks|key|71006|text|检查log-tag中的空间。如果您的标记包含空格，则删除空格，然后运行。您将能够查看日志。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|71007|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check for space in the log-tag. If your tag consist of spaces then remove the space and then run. You will be able to view logs.

blocks|key|71107|text|禁用并卸载您最近安装的和不使用的任何插件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|71108|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Disable and uninstall any plugins that you have recently installed and are not using.

I installed Android Studio yesterday, and I tried to use the LogCat to see the logs. But there is nothing to show in the logcat. I used the terminal to run <code>./adb logcat</code> and it works. 

Is there someone who can explain to me how to use logcat in Android Studio?

Android studio logcat nothing to show

我昨天安装了Android Studio，并尝试使用LogCat查看日志。但是在logcat中没有什么可显示的。我使用终端运行./adb logcat，它工作正常。有没有人可以给我讲解如何在Android Studio中使用logcat？

问Android studio logcat没有可显示的内容
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